Accu-Wave Radar Gauge Radar-Based Continuous Level Measurement Operation Manual DRAFT Part No.
Accu-Wave Radar Gauge Radar-Based Continuous Level Measurement Operation Manual DRAFT Part No. 717790 Version 1.
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Accu-Wave Table of Contents Table of Contents Chapter 1 Introduction ................................................................................................................................ 1-1 Description ..................................................................................................................................................... 1-1 Features and Benefits.........................................................................................................................
Table of Contents Accu-Wave Serial Port Related Action Items ..................................................................................................................... 7-6 Chapter 8 Serial Ports, Contact Inputs, and Special Functions................................................................ 8-7 Serial Ports .....................................................................................................................................................
Accu-Wave Chapter 1 Introduction Chapter 1 Introduction The Accu-Wave Model 1440 Radar Level Gauge uses a microwave signal to continuously measure the level of the process material. The Accu-Wave can often provide better performance than sonic measurement systems, particularly in hostile environments, because the microwave signal is unaffected by mist, surface agitation, temperature changes, or pressure changes.
Chapter 1 Introduction Accu-Wave Measurement accuracy, however, is degraded when the process level is above the bottom of the probe.
Accu-Wave Chapter 1 Introduction Input/Output Characteristics Type Characteristics Comments 0-20 mA dc (adjustable range) Default range is 4-20 mA dc. Isolated, Loop-Powered, 24 Vdc Nominal Supply Voltage, 700 ohm max. load One current output is provided. RS485: One terminal block and one RJ11 Jack Half-duplex party line communication to host computer or Hand-Held Terminal. RS 232: One terminal block (Requires optional board.) Full duplex communication with a remote terminal or PC.
Chapter 1 Introduction Accu-Wave Extensive Alarms You can set up as many as 16 process alarms in addition to system fault alarms and warning alarms. Quick and Easy Setup The menus take you through the setup procedure step–by–step. Built-in help screens are provided at appropriate points in the menu structure.
Accu-Wave Chapter 1 Introduction drive alarms, or open and close switches. The alarms, user inputs, and selected outputs are saved in non-volatile memory. Automatic verification and error correction software continuously monitors system operations. System faults can be programmed to set off alarms. How to Use This Manual For hardware mounting and installation wiring procedures refer to the “Accu-Wave Installation Manual” provided with your gauge.
Chapter 1 Introduction Accu-Wave Chapter 5, “Radar Fine Tuning,” explains the “Radar fine tuning” menu. Use this menu to adjust the setup when false echoes and clutter are present, or to extend the measurement range beyond the zero level point or above the maximum level point. Chapter 6, “Current Outputs, Relays, and Alarms,” explains how to set up the current outputs and relays, and how to assign alarms to measurements other than the primary measurement using the “Outputs, relays and alarms” menus.
Accu-Wave Chapter 1 Introduction TN Technologies’ Service Department The TN Technical Services Department is available to help you, especially with the more complicated procedures such as eliminating spurious echoes.
Accu-Wave Chapter 2 How to Enter Data Chapter 2 How to Enter Data Several methods of entering data are available. You can scroll through the menus to reach the menu item you want, or you can use the direct entry code to access the desired menu item in a single step. For some data entry menu items you use the arrow keys to select from a list, while for other data entry items you enter numbers with the keypad.
Chapter 2 How to Enter Data Accu-Wave Keypad Located below the display, the keypad is used to scroll through menus, change selections, enter data, and enter commands. Figure 2.2 shows the keypad layout. 7 8 9 4 5 6 1 2 3 0 • – EXIT SETUP Contrast ↑ ← → ↓ Contrast Figure 2.2 Transmitter Keypad Layout Moving with the Arrow Keys Use the arrow keys, ←, →,↑and ↓, to scroll through the menus, access HELP menu items, change selections, and execute commands.
Accu-Wave Chapter 2 How to Enter Data Press ↓ to complete the entry. The number will be displayed in the usual scientific notation, 4.567E4. Saving Your Entries Press the EXIT SETUP key at any time while you are using the menus to save your entries and to return to the measurement display. If no entries are made for five minutes, the display times out. Any entries or changes you have made are saved and used by the Accu-Wave software, and the display returns to the measurement display.
Chapter 2 How to Enter Data Accu-Wave allows access to a single menu item, you are not able to scroll to the item which would normally appear next in the menus. Direct Entry In addition to the menu system, you can also access value entries, selection codes, and commands by direct entry. Direct entry is a short cut that bypasses the menu structure. After setup is complete, direct entry can be useful for executing often used commands, changing certain data entry values, or performing diagnostics.
Accu-Wave Chapter 2 How to Enter Data Note: The HEX number is used by the serial port in the “blind computer” mode. You must use the decimal keyboard code to use direct entry via the keypad. The keyboard code, 151002, is the number used for direct entry. Press ↓ to return to the “Allow display of All/Metric/English units” menu item. The following menu item is the first decimal (floating point) data entry item in the “Set up level,…” menus. Distance REF LINE to zero level point. 0.
Chapter 2 How to Enter Data Accu-Wave 3. If the distance shown (50.0 ft) is correct, press the EXIT SETUP key to keep the current value and to return to the measurement display. 4. If the distance shown is not correct, enter the correct value, and press the ↓ key. Verify the distance shown is now correct (re-enter the number if incorrect), and then press the EXIT SETUP key. You will see a brief message, “Processing and storing data wait” before the measurement display returns.
Accu-Wave Chapter 3 Set up Level, Level Alarms, and Volume Chapter 3 Set up Level, Level Alarms, and Volume When power is first applied, the Accu-Wave gauge will be configured to measure distance with a maximum range of 112 ft (34.1 m). Until configured otherwise, the gauge continuously measures and displays distance and signal strength, except when you are in a menu. Note: Allow 2 minutes after start up for the readings to stabilize. The measurement display, shown in Figure 3.
Chapter 3 Set up Level, Level Alarms, and Volume Accu-Wave Set up Primary Measurement (Distance or Level) During the initial setup, you will be asked to enter the distances to the highest and lowest points on the tank that you need the gauge to “see.” Thus, you need to measure these distances on your tank relative to the reference line marked on the sensor. Note the high and low measurement points do not have to be the top and bottom of the tank.
Accu-Wave Chapter 3 Set up Level, Level Alarms, and Volume “Set up Level” menu. The “Comments” column of the table describes the purpose of each menu item. An example showing the specific entries required to set up level as the primary measurement is provided immediately following this table. “Set up Level” Menu Display Set up level, level alarms & volume ← Exit Setup. Other functions→ Comments From the measurement display, press → to move to the “Set up level,...” menu shown at the left.
Chapter 3 Set up Level, Level Alarms, and Volume Accu-Wave “Set up Level” Menu (continued) Display Comments If the primary measurement is distance, the following two menu items are shown. Distance REF LINE to zero distance point 0.000 ft {.6910} MIN NEXT↓ HELP→ Enter the distance from the reference line on the sensor housing to the zero distance point, the closest point to the sensor to be measured. In most cases the zero distance point is the top of the tank.
Accu-Wave Chapter 3 Set up Level, Level Alarms, and Volume Example: Set up Level Set up level as the primary measurement for a tank. Before beginning the gauge setup, you need to measure the distance from the Reference Line on the sensor housing to the desired Zero Level point on the tank and the distance from the Zero Level point to the desired Maximum Level to be measured. See Figure 3.3. Reference Line 22.5 ft Zero Level Maximum Level Zero Level Figure 3.
Chapter 3 Set up Level, Level Alarms, and Volume Accu-Wave Example: Set up Level as Primary Measurement (cont.) Menu Display User Action Allow display of ALL units. Change to Metric or English→ NEXT↓ Select the desired set of measurement units using the → key. The default is ALL which includes both English and Metric units. Then press ↓. Distance units = ft To change to yd, M, cm, mm, or in press→ NEXT↓ Use the → key to scroll through and select the desired measurement units.
Accu-Wave Chapter 3 Set up Level, Level Alarms, and Volume Alarms: Set Point, Clear Point, and Dead Band An alarm is defined with either a set point - clear point configuration, as shown in Figure 3.4, or a set point - dead band configuration, as shown in Figure 3.5. The set point defines the measurement value, either level or distance for the primary measurement, at which the alarm is activated. The clear point or the dead band defines the measurement value at which the alarm is cleared (alarm ceases).
Chapter 3 Set up Level, Level Alarms, and Volume Dead Band (2 m) Implied Clear Point (4 m) Dead Band (2 m) Initial Set Point (2 m) Accu-Wave Implied Clear Point (5 m) Initial Set Point (3 m) a. Initial Set Point / Dead Band b. Modified Set Point / Dead Band Figure 3.5 Set Point / Clear Point Alarm High Limit and Low Limit Alarms An alarm is activated when the measurement value reaches the specified set point.
Accu-Wave Chapter 3 Set up Level, Level Alarms, and Volume “Set Up Alarm 1” Menu (Primary Measurement) This table describes the menu items in the “Set up Alarm” menu group. “Set up Alarm” Menu Display Set up alarm 1 (Alarm point, etc.)→ NEXT↓ Comments Menu is normally available only if relays are installed. Press → to access alarm menu or ↓ to skip alarm set up. After alarm 1 is set up, menu to set up alarm 2 will be available, and so on.
Chapter 3 Set up Level, Level Alarms, and Volume Accu-Wave The next table presents those menu items specifically related to controlling a relay as an alarm indicator. As noted in the Comments column, several of the menu items are only displayed if options have been enabled in the “Special functions” menu, see “Special Functions” on page 8-19.
Accu-Wave Chapter 3 Set up Level, Level Alarms, and Volume Since the measurement value for the set point (18.0 ft) is greater than the value of the clear point (15.0 ft), this is a high limit alarm. The required steps to implement this alarm are listed in the table following Figure 3.6. Reference Line Maximum Level - 18.0 ft 22.5 ft Set Point - 15.0 ft Clear Point - 13.0 ft Zero Level Zero Level Figure 3.
Chapter 3 Set up Level, Level Alarms, and Volume Accu-Wave Example: Low Limit Distance Alarm This example illustrates how to set up a low limit distance alarm using a Set Point/Dead Band alarm configuration. The primary measurement has been set up as distance with the “Distance REF LINE to zero distance point” set to 4.5 ft and the “Distance REF LINE to maximum distance point” set to 22.5 ft as illustrated in Figure 3.7.
Accu-Wave Chapter 3 Set up Level, Level Alarms, and Volume Example: Set up Low Limit Distance Alarm Display Set up alarm 1 (Alarm point, etc.)→ NEXT↓ ← Exit alarm 1 setup Alarm 1 set point 3.00 ft dist NEXT↓ HELP→ Comments Set up alarm 1 to be a high limit level alarm as illustrated in Figure 3.5. Press → to access the “Set up alarm” menu items. Enter 3.0 followed by ↓ to enter the desired level for the set point relative to the zero distance level.
Chapter 3 Set up Level, Level Alarms, and Volume Note: Accu-Wave Once you have set up the tank volume, volume is set as a default measurement and is shown on the measurement display. To use volume to drive a current output or an alarm, you must use the “Set up additional measurements” menu (see Chapter 4) to assign volume to a specific measurement number and to set up the parameters for the current output or alarm. Tank Shapes The first step in setting up the tank volume is to define the tank shape.
Accu-Wave Chapter 3 Set up Level, Level Alarms, and Volume Tank Volume Units Select the units for the volume display. Select measurement units in which to report volume. The following units are available for volume. If you previously selected “English” or “Metric” units for display, rather than “All,” the appropriate subset of the units listed below will be available.
Chapter 3 Set up Level, Level Alarms, and Volume Accu-Wave actual volume is not zero at the zero level point, enter the correct value here. This menu item is only displayed when you select the “other tank shapes or compound shapes” option for the tank shape. If you have selected one of the six basic shapes, but need to specify a non-zero volume for the zero level point there are two options.
Accu-Wave Chapter 3 Set up Level, Level Alarms, and Volume Up to eight segments can be defined to describe the tank shape. After you set up segment #1, the menu will prompt you to “Assign & setup segment #2,” and so on. If you do not need to specify another segment, simply scroll past the “Assign & setup segment” menu item.
Chapter 3 Set up Level, Level Alarms, and Volume Note: Accu-Wave Only one volume break table can be defined. The same volume break table can be applied to more than one segment. For heights which fall between the values entered in the break table, the gauge interpolates between the table values to compute the volume. The more points you enter, up to the maximum of 16, the more accurate your volume reading will be.
Accu-Wave Chapter 3 Set up Level, Level Alarms, and Volume “Tank Volume Set up” Menu for “Basic” Tank shapes Display tank volume setup→ Comments Press → to access the tank volume setup menu items. NEXT→ ← Exit volume setup. Set up tank volume↓ Volume setup HELP→ tank shape is vertical cylinder. Press ↓ to continue. Change tank shape→ Press → to access HELP screens for volume setup. Press ↓ to continue with volume setup. Press ← to exit from volume setup. Initially tank shape is “none.
Chapter 3 Set up Level, Level Alarms, and Volume Accu-Wave “Tank Volume Set up” Menu for “Compound” Tank Shapes Display For other shapes or compound shapes.↓ Comments Press → to change the tank shape. Press ↓ to set up the tank volume using “compound” shapes. Change tank shape→ tank volume units: litre Select the units for displaying volume. See page 3-15 for a complete list of the available units.
Accu-Wave Chapter 3 Set up Level, Level Alarms, and Volume “Break Point Table” Menu Display Comments Modify segment 3 Vol = 1st order break tab of height→ NEXT↓ Press → to modify setup. Segment 3 is currently set up as a 1st order volume break table. segment 3 is type 21 Vol = 1st order break tab of height→ Continue↓ Change→ Press → to setup parameters for volume break table. Level at bottom of Segment 3,(type 21) 3.000 M NEXT↓ Specify level at bottom of segment.
Chapter 3 Set up Level, Level Alarms, and Volume VERTICAL CYLINDER TYPE 1 Accu-Wave VERTICAL CONICAL TYPE 3 VERTICAL RECTANGLE TYPE 2 TOP DIAMETER WIDTH DIAMETER BOTTOM DIAMETER LENGTH VERTICAL SPHERICAL TYPE 4 TOP DIAMETER BOTTOM DIAMETER VERTICAL PARABOLIC TYPE 5 TOP DIAMETER TOP DIAMETER BOTTOM DIAMETER BOTTOM DIAMETER RECTANGULAR TOP AND BOTTOM TYPE 7 WIDTH OF TOP WIDTH OF TOP LENGTH OF TOP LENGTH OF TOP LENGTH OF BOTTOM LENGTH OF BOTTOM WIDTH OF BOTTOM WIDTH OF BOTTOM LENGTH OF
Accu-Wave Chapter 3 Set up Level, Level Alarms, and Volume SLOPED BOTTOM VERTICAL CYLINDER TYPE 9 ANY SHAPE WITH VERTICAL SIDES (EXAMPLE) TYPE 10 DIAMETER AREA TOP OF SEGMENT BOTTOM OF SEGMENT DIM C HORIZONTAL CYLINDER WITH FLAT ENDS TYPE 11 HORIZONTAL CYLINDER WITH DOMED ENDS TYPE 12 TOTAL LENGTH BOTTOM OF SEGMENT BOTTOM OF SEGMENT DIAMETER BOTTOM OFFSET DIAMETER BOTTOM OFFSET LENGTH NOT INCLUDING DOMED ENDS LENGTH DOMED END TYPE 14 SPHERE TYPE 18 WIDTH (DEPTH) DIAMETER BOTTOM OF SEGMENT
Accu-Wave Chapter 4 Set up Additional Measurements Chapter 4 Set up Additional Measurements As described in Chapter 3, the primary measurement (measurement #1) is set up as either level or distance using the “Set up level,...” menu. Up to seven additional measurements can be set up using the “Set up additional measurements” menu. You can use these measurements to drive a variety of alarms and current outputs to meet the needs of your processing procedures.
Chapter 4 Set up Additional Measurements Accu-Wave It is good practice to make a list of all the measurements you set up and keep the list for future reference. Select Measurement Menus “Set up Additional Measurements” Menu (Specify Measurement Type) Display Comments Set up additional measurements (readouts).↓ Other functions→ You can assign up to 7 measurements in addition to the primary measurement. (Primary measurement setup is described in Chapter 3.) Press ↓ to set up additional measurements.
Accu-Wave Chapter 4 Set up Additional Measurements • • • • • pound pounds metric ton 1000 kg short ton 2000 lbs long ton 2240 lbs oz avoirdupois ounces After specifying the mass units, you next enter the density of your material. (Mass is computed as the specified density times the volume measurement.) The value entered for the density must be in the same units (mass/volume) as specified for the mass and volume measurements.
Chapter 4 Set up Additional Measurements • • M y Accu-Wave months years Measurement Parameter and Units Menus “Set up Additional Measurements” Menu (Measurement Specific Parameters and Units) Display Comments Note: After selecting a measurement type, menu item(s) prompt for the required parameters to finish setting up the measurement, as shown below. If “Distance” or “% distance” are selected, the following menu items are displayed.
Accu-Wave Chapter 4 Set up Additional Measurements 0.000 cu ft NEXT↓ material is computed based on the tank volume setup and the level measurement. The volume of the tank when full is required to compute the ullage (empty volume), the % full and the % empty values. “Set up Additional Measurements” Menu (Measurement Specific Parameters and Units) (cont.) Display Comments If “mass” is selected, the following menu items are displayed. Mass units: Kgram NEXT↓ CHANGE→ material density 0.
Chapter 4 Set up Additional Measurements Accu-Wave Measurement Display Setup In the default configuration, the 4-line display can show 3 measurements readouts (or up to 6 measurements by alternately displaying 3 readouts at a time). The fourth line displays the instruction “For setup, press →.” Like the primary measurement, the signal strength (sig str) measurement is displayed by default. If the tank volume setup has been completed, the tank volume is also displayed by default.
Accu-Wave Chapter 4 Set up Additional Measurements Do or Do Not Display Use this menu item to select whether to display the measurement. Normally, any measurement you set up is automatically displayed. If you select “Do not display,” the measurement is not displayed, but you can still use the measurement to drive alarms or current output. For example, if the volume measurement has been set up, the volume readout will be displayed by default.
Chapter 4 Set up Additional Measurements Accu-Wave you expect, the readout will still display the correct, scaled measurement value, as long as the scaled value can be displayed in four digits. In our example where 40,000 liters is scaled to read 40.00 on the display, if the gauge measures 43,875 liters, the displayed value would be 43.88. Any value up to 99,999 would be displayed correctly, rounded to four significant digits.
Accu-Wave Chapter 4 Set up Additional Measurements Set Up Alarm… The primary measurement is automatically assigned to measurement 1; however, signal strength, volume, and other measurements are not assigned a measurement number by default. Therefore, volume, signal strength, and other measurements are not available to drive the current output, alarms, or relays until you assign them to a measurement number using the “Set up additional measurements” menu.
Chapter 4 Set up Additional Measurements Accu-Wave Set up Alarm Menu Note: If relays are installed, the default indicator for alarm N is “controlling relay N,” even if N exceeds the number of relays. Press → to change the alarm indicator, and the “controlling relay #” options will then correctly reflect the number of installed relays. “Set up Alarm” Menu Display Set up alarm 3 (Alarm point, etc.)→ NEXT↓ Comments This item only shows up if an alarm (e.g.
Accu-Wave Chapter 4 Set up Additional Measurements The next table presents those menu items specifically related to controlling a relay as an alarm indicator. As noted in the Comments column, several of the menu items are only displayed if options have been enabled in the “Special functions” menu. The Special Functions Menu is described on page 8-19.
Accu-Wave Chapter 5 Radar Fine Tuning Chapter 5 Radar Fine Tuning The basic setup parameters entered via the “Set up Level,…” menu items (see Chapter 3) establish the measurement range, or the region of interest, along with echo qualification criteria. The measurement range defines the region over which the Accu-Wave gauge looks for echoes.
Chapter 5 Radar Fine Tuning Accu-Wave 4. False Echo Management There can be several sources of radar echoes other than the material surface. If the automatic echo selection criteria are adequate for identifying the echo from the surface in your application, this menu provides tools to help the system select the proper echo. From the measurement display, use the → key to scroll to the “Radar fine tuning” menus. Press ↓ to enter this menu group and to scroll to the four menu groups listed above.
Accu-Wave Chapter 5 Radar Fine Tuning “Material Type and Measurement Head Setup” Menu Display Comments material type and measurement head setup→ NEXT↓ Menu entry point for the “Material Type and Measurement Head Setup” menu group. Press → to access these menu items, press ↓ to continue to the next “Radar fine tuning” menu group. ← Exit from: Press ← to exit this menu group or press ↓ to proceed. material type and measurement head setup→ NEXT↓ Set gain = 0.000 (1.
Chapter 5 Radar Fine Tuning Accu-Wave “Material Type and Measurement Head Setup” Menu (continued) Display flange mounted seal velocity correction value = 0.000 NEXT↓ HELP→ Comments Displayed if “antenna with flange mounted seal” is selected above. Enter velocity correction value (in cm) to correct for the reduced propagation velocity of the process seal(s). See Error! Reference source not found.. If this value is left at zero, the process seal will induce a small offset error.
Accu-Wave Chapter 5 Radar Fine Tuning “Modify Range of Measurement” Menu Display Comments Distance REF LINE to highest possible level 0.000 ft NEXT↓ HELP→ Defines top of the ROI. If this entry is 0.0, the top of the ROI is set by the maximum level (or zero distance point) entry for the primary measurement. A non-zero entry here overrides the default value for the top of the ROI, and defines the closest echo processed. The gauge will not correctly measure above this level. Minimum value is 2.12 m (0.
Chapter 5 Radar Fine Tuning Accu-Wave Response Time, Lost Echo, and Agitator Reject Setup The “Response Time, Lost Echo, and Agitator Reject Setup” menus provide entries to control the system response time, what action to take when the signal (echo) is lost, and the response to a temporary loss or change in the echo. When the Accu-Wave gauge is first turned on, the system begins processing the echoes received from the microwave transmission to identify the true echo from the material surface.
Accu-Wave Chapter 5 Radar Fine Tuning • • • “Do bypass range gate for near echoes” has been selected and the echo falls short of the range gate “Do bypass range gate for far echoes” has been selected and the echo falls beyond the range gate Past echoes have fallen outside of the range gate for a period equal to the “agitator reject time” (range gate delay time) If none of the above conditions are met, the next transmission is processed, a new echo report is generated, and the entire process is repeated u
Chapter 5 Radar Fine Tuning Accu-Wave but will allow any echoes beyond the level (lower) to be accepted without considering the range gate. Note: If you want to use an agitator reject time entry of “forever,” enter 65535 seconds. Range Gate Weighting Factor (GWF) A range gate weighting factor (GWF) can be applied to echoes that fall within the range gate. A GWF value greater than 1 gives additional preference to echoes within the range gate during the processing to select the best candidate.
Accu-Wave Chapter 5 Radar Fine Tuning “Response Time, Lost Echo and Agitator Reject Setup” Menu Display Comments Level Signal time constant 4 seconds NEXT↓ HELP→ Time constant for smoothing filter applied to the primary measurement (level or distance). Range of time constant value is from 1 to 1000 seconds. The longer the time constant, the greater the smoothing, and the slower the response of the system. Default value is 4 seconds.
Chapter 5 Radar Fine Tuning Accu-Wave “Response Time, Lost Echo and Agitator Reject Setup” Menu (continued) Display Increase range gate height by 0.000% of distance to surface NEXT↓ [Service only item] weighting factor (GWF) for echoes inside range gate. 0.000 NEXT↓ [Service only item] Comments This variable can be used to increase the range gate hieght by a percent of the distance to the surface.
Accu-Wave Chapter 5 Radar Fine Tuning False Echo Management Use the “False echo management” menu to correct false readings caused by unwanted echoes. False echo management has three primary approaches to eliminating false echoes. The first is to constrain the set of candidate echoes to the smallest group that will reliably include the desired echo. The second applies test criteria that can reject some of the unwanted echoes.
Chapter 5 Radar Fine Tuning Accu-Wave The second line shows that the Q1 echo quality factor for echo 2 is 180 (larger values indicate better quality). The distance of echo 2 relative to the reference line on the sensor is 33.75 ft. The third line shows that the Q2 echo quality factor for echo 2 is 45 (again larger values indicate better quality). The signal strength of echo 2 is 22.11, before any weighting factors or other selection modifiers are applied.
Accu-Wave Chapter 5 Radar Fine Tuning Warning: If the desired echo’s signal strength exceeds the “maximum desired signal strength,” the desired echo will be rejected, unless it is the only candidate echo. If the quality factor of the desired echo does not exceed the quality factor rejection threshold, the desired echo will be rejected. Echo Weighting Factors There are four echo weighting tools available for difficult applications. 1.
Chapter 5 Radar Fine Tuning Accu-Wave Example: Locking on to False Target Closer (higher) than Material Surface When the process material has a low dielectric constant, the return signal from the material surface can be weaker than the echoes from false targets.
Accu-Wave Chapter 5 Radar Fine Tuning “False Echo Management” Menu Display View echoes being processed→ NEXT↓ echo amplitude successive weighting factor(SWF)=.5000 NEXT↓ HELP→ Comments Allows you to examine the echo report for each echo within the range of interest. Press → to access the echo reports, then press ↓ to scroll through the echo reports. The echo report is described on page 5-11.
Chapter 5 Radar Fine Tuning Accu-Wave “False Echo Management” (continued) Display bottom echo signal strength factor 0.000 NEXT↓ [Service only item] Comments When set to 0.0 (default), this factor is not used in the echo selection process. When a non-zero value is entered, this weighting factor is applied to echoes at the “distance (from the) REF LINE to tank bottom” (next menu item) and beyond in the echo selection process. Note: Limit setting between 0.05 to 1.0.
Accu-Wave Chapter 5 Radar Fine Tuning Clutter Data Management Imperfections in the transition from the microwave head to the tank can cause microwave energy to be reflected. These imperfections can be due to poor alignment of the nozzle pipe during welding, pipe size mismatch, joints, valves, pipe liner, or material buildup.
Chapter 5 Radar Fine Tuning Accu-Wave by taking new clutter data, selecting “Do” disable clutter erase, or entering a clutter distance of zero (which disables the clutter erase feature). The need for clutter erase can be established by viewing the echo report. Look for echoes within a few feet (up to 7 ft or 2 m). If the signal strength associated with these echoes is more than 5% of the signal strength from the material surface, you should consider doing clutter erase.
Accu-Wave Chapter 5 Radar Fine Tuning “Clutter Data Management” Menu Display Comments Clutter distance {from REF LINE} 0.000 ft {7.826 MAX} NEXT↓ If this entry is 0.0, the Clutter Data Mgmt menu items will not be displayed. Maximum allowable clutter distance is 7.147 feet or 25% of the maximum measurement range, whichever is greater. When a clutter erase command is executed, clutter data is collected to the maximum clutter distance.
Chapter 5 Radar Fine Tuning Accu-Wave “Service Clutter Items” Menu [“Service Only Items” must be enabled] Display ← Exit from: service clutter items NEXT↓ HELP→ Comments Provides an additional set of diagnostic tools, if “service only items” are enabled. clutter spectrum count to average 8 {1 – 64} NEXT↓ Number of clutter spectrum values to average. Default value is 8. Gain: now 1.252 clutter 1.252 stored 1.252 (read only) NEXT↓ gain: cm/tic: now 1.488E-2 clutter 1.488E-2 stored 1.
Accu-Wave Chapter 5 Radar Fine Tuning Tank Map Setup Tank mapping is used to map an empty tank for the physical targets such as ladders, beams, baffles, etc. Use Region Weighting Setup if the reflections from an agitator blade need to be mitigated. When tank map data is collected, the gauge can map up to 12 echoes.
Chapter 5 Radar Fine Tuning Accu-Wave User Considerations If the tank is not quite empty or you do not want to map the tank bottom, it is essential that the user-entered map distance be at least 30 cm (1 ft) above the level of the process material (or tank bottom) while the tank map data is taken. If both the tank mapping and clutter erase tools are being utilized, the clutter erase data must be acquired prior to tank mapping.
Accu-Wave TN Technologies Chapter 5 Radar Fine Tuning 5-23
Chapter 5 Radar Fine Tuning Accu-Wave “Tank Map Setup” Menu (cont.) [“Service Only Items” must be enabled] Display ignore mapped echoes Change to “derate”→ Comments Continue as is↓ Echoes corresponding to a mapped echo (echoes that meet all three “hit” criteria) can either be ignored or “derated” by a weighting factor. The default is to ignore all hits. Map echo weighting factor (MWF) 5.000e-2 This menu item is only displayed if the above item was changed from “ignore to “derate.
Accu-Wave Chapter 5 Radar Fine Tuning “Region Weighting Setup” Menu [“Service Only Items” must be enabled] Display Do not enable region weighting Change to “Do”→ Continue as is.↓ Comments When set to default value of “Do not enable region weighting,” the menu items below are not displayed. Change to “Do” to enable region weighting. Reset to “Do not” at any time to disable region weighting. Direct Entry Code: ‘026050’.
Chapter 5 Radar Fine Tuning Accu-Wave Dynamic Threshold Setup Note: The “Dynamic Threshold Setup” menu items are only displayed when the “Service Only Items” are enabled. Direct Entry Code 025020. If the dynamic threshold setup is required, the Agitator Reject Time (Direct Entry Code 044003) should be increased to 8 seconds or longer. Setting a dynamic threshold is intended to help track a turbulent process.
Accu-Wave Chapter 5 Radar Fine Tuning “Dynamic Threshold Setup” Menu [“Service Only Items” must be enabled] Display Do not enable dynamic threshold Change to “Do”→ Continue as is.↓ Comments When set to default value of “Do not enable dynamic threshold,” the menu items below are not displayed. Change to “Do” to enable dynamic threshold. Reset to “Do not” at any time to disable dynamic threshold. Direct Entry Code: ‘026060’ Change dynamic threshold by .
Chapter 5 Radar Fine Tuning • • • Accu-Wave Maximum level to be measured: False Echo Management menu: − Successive weighting factor (SWF): 24.00 ft − Bottom echo signal strength factor: 0.25 − Distance REF LINE to tank bottom: 24.00 ft 0.5 (default) Response Time, Lost Echo and Agitator Reject menu: − range gate weighting factor (GWF): 5 Region Weighting Setup: Region Number Region Boundary Weighting Factor 1 REF LINE – 11.00 ft 1.5 2 11.00 – 13.00 ft 2.0 3 13.00 ft – max distance 1.
Accu-Wave Chapter 6 Cuurent Outputs, Relays, and Alarms Chapter 6 Current Outputs, Relays, and Alarms This chapter covers the “Modify or reassign current output” menu (the “Current output” menu) and the “Set up fault alarms or change process alarm assignments” menu (the “Alarm” menu). Current Outputs Note: If your MeasureTech Accu-Wave does not have an I/O board with a current output installed, the “Modify or reassign current output” menu will not be displayed.
Chapter 6 Cuurent Outputs, Relays, and Alarms Accu-Wave “Modify or Re-assign Current Output” Menu Display Modify or re-assign current output↓ Comments Press ↓ to access “Current Output” menu items. Press → to scroll to other menus. Other functions→ maximum current output 20.00 mA (4.000 to 20.00) NEXT↓ The range for the maximum current output is from the minimum current output (currently 4.000mA) to 20.00mA. The default value for the maximum current output is 20.00mA. minimum current output 4.00 mA (.
Accu-Wave Chapter 6 Cuurent Outputs, Relays, and Alarms Set Up Fault Alarms or Change Process Alarm Assignments Note: If no relays are installed in your gauge, the “Set up fault alarms...” menu will not be displayed initially. Use the “Special functions” menu (page 819) to enable alarm related functions so you can set up a non-relay display alarm or other indicator.
Chapter 6 Cuurent Outputs, Relays, and Alarms Accu-Wave “view alarm status” and “view alarm history,” see “Diagnostics: System Test, Related Items” on page 9-2. Set up for Alarms to Execute Commands Use the following procedure to set up alarms to execute commands: 1. Use the “Set up Alarms to Execute Commands” menu items (see table below) to define up to 3 sets of alarm actions.
Accu-Wave Chapter 6 Cuurent Outputs, Relays, and Alarms Alarm Commands The following commands can be assigned as alarm actions: • • • • • • • • • • • • • • • • • • • • do nothing hold current output at 50.
Chapter 6 Cuurent Outputs, Relays, and Alarms Accu-Wave By default all 16 alarms are assigned to the primary measurement, measurement 1. “Assign Alarms to Measurements” Menu Display Assign alarms to measurements→ NEXT↓ #1 alarm monitors measurement 1 ft level Continue↓ Change→ Comments Menu subgroup heading. Press → to access menu items, press ↓ to scroll to next “Alarms” menu subgroup. Only displayed if you have set up one or more additional measurements (other than primary).
Accu-Wave Chapter 6 Cuurent Outputs, Relays, and Alarms Assign “Relays” to Warning Alarms and Fault Alarms This menu assigns actions to indicate a warning alarm state, a system fault alarm or a signal loss alarm. “Assign Relays to Warning and Fault Alarms” Menu Display Comments Assign “relays” to warning alarms and fault alarms→ NEXT↓ Menu subgroup heading. Press → to access menu items, press ↓ to scroll to next “Alarms” menu subgroup.
Chapter 6 Cuurent Outputs, Relays, and Alarms Accu-Wave Assign “Relays” to Mode Alarms This menu assigns actions (alarm indicators) to the mode alarms. “Assign Relays to Mode Alarms” Menu Display Comments Assign “relays” to mode alarms→ NEXT↓ Menu subgroup heading. Press → to access menu items, press ↓ to scroll to next “Alarms” menu subgroup. For each of the following menu items, press → to scroll through and select the desired alarm indicator.
Accu-Wave Chapter 7 Action Items Chapter 7 Action Items The “Action Items” menu contains the most frequently used commands. Commands are grouped by function into four menu subgroups. • • • • “Common action items” menu: use this menu to restart the system, erase all entries, clear all holds, change mode, and zero relays. “Alarm action items” menu: use this menu to clear, acknowledge, disable, erase, show history, end delays, and zero relays for all alarms.
Chapter 7 Action Items Accu-Wave Common Action Items “Common Action Items” Menu Display Common action items (clear memory, etc)→ NEXT↓ Comments Press → to enter the “Common action items” menu. Press ↓ to continue to next “Action Item” menu subgroup. System restart. Does not affect user data ← Exit this menu. NEXT↓ EXECUTE CMD→ Restarts system – erases temporary memory, but does not affect user-entered setup data. Erase all entries!!! (except COMM setup) ← Exit this menu.
Accu-Wave Chapter 7 Action Items Alarm Action Items “Alarm Action Items” Menu Display Alarm action items (View, clear, etc)→ NEXT↓ view alarm status→ NEXT↓ view alarm history→ NEXT↓ Clear all alarms ← Exit this menu. NEXT↓ EXECUTE CMD→ Comments Press → to enter the “Alarm action items” menu. Press ↓ to continue to next “Action Item” menu subgroup Press → to review all alarms currently in effect.
Chapter 7 Action Items Accu-Wave Hold Action Items “Hold Action Items” Menu Display “Hold” action items (Hold reading, etc)→ Comments Press → to enter the “Hold action items” menu. Press ↓ to continue to next “Action Item” menu subgroup. NEXT↓ 7-4 Clear all holds (none now in effect) ← Exit this menu. NEXT↓ EXECUTE CMD→ Execute this command to clear all holds (if any holds are in effect). Hold current output at max (20.00 mA) ← Exit this menu.
Accu-Wave Chapter 7 Action Items “Hold Action Items” Menu (cont.) Display Comments level hold value 0.000 cm {for abs level test} {cmd 154} NEXT↓ Enter hold value for level used to test the absolute level. Execute level hold using the next menu item. Hold level at 0.000 ft level ← Exit this menu. NEXT↓ EXECUTE CMD→ Press → to execute command to hold primary measurement value at the hold value specified in the previous menu item. Use “Clear all holds” command (first item in this table) to clear.
Chapter 7 Action Items Accu-Wave Serial Port Related Action Items “Serial Port Related Action Items” Menu Display serial port related action items→ NEXT↓ 7-6 Comments Press → to enter the “Hold action items” menu. Press ↓ to return to main heading for the “Action Items…” menu group update data output to port 1, RS232 ← Exit this menu. NEXT↓ EXECUTE CMD→ Sends a data set (as defined by serial transmit setup or default) to RS-232 port. update data output to port 2, RS485 ← Exit this menu.
Accu-Wave Chapter 8 Serial Ports, Contact Inputs & Special Fcts Chapter 8 Serial Ports, Contact Inputs, and Special Functions This chapter describes the menu items under the “Set up serial ports, contact INPUT, or Special functions” menu. This menu group includes menu subgroups for the following gauge functions. Configure the RS-232 (port 1) and RS-485 (port 2) serial ports for communicating with computer terminals and printers and set up the data stream transmission parameters.
Chapter 8 Serial Ports, Contact Inputs & Special Fcts Accu-Wave ANSI terminal: The gauge sends ANSI escape sequences for screen and cursor control which are supported by ANSI terminals and by most PC-based communication packages. This setup allows full access to the gauge menu system from the terminal. The arrow keys on the terminal keypad behave in the same fashion as the intergral keypad on the transmitter.
Accu-Wave Chapter 8 Serial Ports, Contact Inputs & Special Fcts “Modify Port 1 RS232 (Port 2 RS485) Configuration” Menu Display Comments Modify Port 1 RS232 configuration→ (baud rate, parity) NEXT↓ Press → key to access the “Modify port configuration” setting menus. Do not disable port 1 RS232 Change to “Do”→ Continue as is.↓ Turns port on or off. Change to “Do” if you need to temporarily disable the RS-232 port. unit number of this gauge (0 to 32) 0 (Should be 0 if not party line.
Chapter 8 Serial Ports, Contact Inputs & Special Fcts Accu-Wave can be formatted for various terminals (CRTs), printer presentations, or for host computers. Data streaming on a party-line (RS-485 multiple units) is automatically suspended when you send the “SLEEP” command, and is normally suspended when you “CONNECT” to any unit on the party line.
Accu-Wave Chapter 8 Serial Ports, Contact Inputs & Special Fcts “Modify Port 1 RS232 (Port 2 RS485) Configuration” Menu (cont.) Display Comments The following menu item is repeated for measurement (1-8) which has been set up. Do not send meas 1 ft level to RS232 port. NEXT↓ CHANGE→ Similar menu item is displayed for each measurement number you have set up. You can enable or disable the transmission of the data for each measurement individually.
Chapter 8 Serial Ports, Contact Inputs & Special Fcts Accu-Wave Set Up Data Format (Non-Packet Text Data) Menu The “Set Up Data Format” menu items for non-packet data are displayed if “Do not transmit data in packet format” is selected in the “Set up port … transmission data” menu. These menu items establish the formatting used for non-packet text transmission (for example, labeling, tabulation, and pagination) for measurements sent to a terminal or printer.
Accu-Wave Chapter 8 Serial Ports, Contact Inputs & Special Fcts “Set Up Data Format (Non-Packet Data)” Menu (cont.) Display TN Technologies Comments Do CLEAR & HOME before each data set. Change to “Do not”→ Continue as is.↓ Sends an ANSI clear/home escape string after data set. Do not send NEWLINE after each data set. Change to “Do”→ Continue as is.↓ Change to “Do” to send logical NEWLINE after transmission of a gauge’s data set. Do not send user msg before each data set.
Chapter 8 Serial Ports, Contact Inputs & Special Fcts Accu-Wave Setup Header, Form Feed, and Message This menu subgroup is only displayed when “Do not transmit data in packet format” is selected in the “Set up port … data transmission menu.” These menu items allow you to set up formatting information such as headers and form feeds. These items are most often used for formatting data to be sent to a printer.
Accu-Wave Chapter 8 Serial Ports, Contact Inputs & Special Fcts Party–Line Communications This section describes various aspects of setting up and using party-line communications for multiple gauges. Setting up a Party-Line To set up party-line communications from the local keypad and display of each gauge on the party-line, use the following procedure. 1.
Chapter 8 Serial Ports, Contact Inputs & Special Fcts Accu-Wave Master Update Time Gauges on a party–line transmit their data following the timing diagram shown in Figure 8.1. All of the gauges wait for the master unit to transmit a “sync” character (Ctrl-V, ASCII 22). The master gauge transmits this synch character once per the update time interval which is specified in the “Set up port … data transmission” menu.
Accu-Wave Chapter 8 Serial Ports, Contact Inputs & Special Fcts When a unit is in “Connect” mode, the unit’s setup menus can be accessed (if not in Blind or Printer mode) and the unit will continue to send updates if “Do data stream in connect mode” has been enabled. Connect mode is exited when a valid DISCONNECT command is received. A unit in Sleep mode will not respond to anything except a valid WAKEUP Command. Party-Line Commands Some useful escape codes are: ESC [ Z# uu CONNECT Command.
Chapter 8 Serial Ports, Contact Inputs & Special Fcts Accu-Wave The party-line also behaves erratically when more than one device issues synch characters. This can happen if there is more than one master on the link, or if synch characters are sent from a terminal or PC. Data streaming has to be explicitly turned off in the “Set up port 2 RS485 data transmission” menu. Deselecting all measurements from data streaming will not inhibit data streaming.
Accu-Wave Chapter 8 Serial Ports, Contact Inputs & Special Fcts Special Functions “Special functions” Menu Display TN Technologies Comments Do not enable alarm related selections Change to “Do”→ Continue as is.↓ Displayed if no relays are installed. Change to “Do” to enable the alarm-related menu selections throughout the setup menus. Do not enable alarm relay delay times. Change to “Do”→ Continue as is.↓ Only displayed if relays are installed.
Chapter 8 Serial Ports, Contact Inputs & Special Fcts Accu-Wave “Special functions” Menu (cont.) Display Do not enable user defined (UD) units. Change to “Do”→ Continue as is.↓ Comments Change to “Do” to enable user defined units option in the various “Select Units” menu items. Note: Enabling the “Service only items” causes additional items to show up in various “Radar Fine Tuning” submenus as well as in other setup menus. Do not enable service only items. Change to “Do”→ Continue as is.
Accu-Wave Chapter 8 Serial Ports, Contact Inputs & Special Fcts In each case, you can access any of the custom messages which have been entered. You can modify an existing message or add a new message, and then select which message to use for a particular purpose. You enter message characters by using the right and left arrow keys to scroll through the available character selections or by using the ASCII codes for the characters given in the table below.
Chapter 8 Serial Ports, Contact Inputs & Special Fcts Accu-Wave “Set up Custom Units Messages” Menu Display Set up custom units messages→ NEXT↓ character #1 of custom message #1 0 ← → “” NEXT↓ Comments Press → to access the custom message setup menu items. There is a maximum of 8 messages, 10 characters per message. The custom units message has no effect on the measurement readout. Enter first character of the first custom message.
Accu-Wave Chapter 9 Security, Service & Diagnostic Chapter 9 Security, Service, and Diagnostics The “Security, service and diagnostic functions” menus is divided into four primary menu subgroups. • • • • Security Items: (Password, etc.) Diagnostics: System Test, Related Items User Service & Related Items Factory Service & Related Items (only available if “Service Only Items” are enabled) These menu groups are described in this chapter.
Chapter 9 Security, Service & Diagnostics Accu-Wave “Security Items” Menu Display Security items: Password, etc.) Comments Press → to access the “Security items” menus. NEXT→ password ******** (Lock out setup) NEXT↓ HELP→ A password can be any combination of numbers up to 8 digits long. Once a password is entered, the first item in SETUP will ask for the password. To disable the password function, enter 0 here.
Accu-Wave Chapter 9 Security, Service & Diagnostic “Diagnostics: System test, related items” Menu Display Diagnostics: System test, related items→ Comments Press → to access the “Diagnostic…” menu items. NEXT↓ Run self test ← Exit this menu. NEXT↓ EXECUTE CMD→ View alarm status→ NEXT↓ View alarm history→ NEXT↓ Serial port error logs→ NEXT↓ relay history logs→ NEXT↓ Program rev # 4.31 Execute the self-test command to test the various types of memory, the data integrity, and the signal processor.
Chapter 9 Security, Service & Diagnostics Accu-Wave Serial Port Error Logs “Serial Port Error Logs” Menu Display Serial port error logs→ Comments Press → to access submenu containing error logs for RS-232 and RS-485 serial ports. NEXT↓ 0 frame errors on RS232 port NEXT↓ Number of RS232 port frame errors. 0 parity errors on RS232 port NEXT↓ Number of RS232 port parity errors 0 over run errors on RS232 port NEXT↓ Number of RS232 port overrun errors.
Accu-Wave Chapter 9 Security, Service & Diagnostic Relay History Logs “Relay History Logs” Menu Display Comments relay history logs→ NEXT↓ Only displayed if relays are installed. Press → to access non-volatile logs (saved every hour) of relay activity. Relay 1 on time 142.1 hours (non-volatile save once per hour) NEXT↓ Cumulative total of “on” time (need not be continuous) for relay 1. This menu item is repeated for each relay installed. Relay 1 has been on 25 times.
Chapter 9 Security, Service & Diagnostics 9-6 Accu-Wave TN Technologies
Accu-Wave Chapter 9 Security, Service & Diagnostic “Snapshot” Menu (cont.) [Service only item] Display Comments base signal strength 113.9 NEXT↓ Signal Strength of “best” candidate echo as reported in the echo report. weighted signal strengh 113.9 NEXT↓ Signal strength of “best” candidate echo after weighting factors have been applied. View echos being processed→ Allows you to examine the echo report for each echo within the range of interest.
Chapter 9 Security, Service & Diagnostics Accu-Wave View marker report Before viewing any of the marker report items with direct entry, you must enter command 13 to tell the system to prepare the data. “View Marker Report” Menu [Service only item] Display View marker report→ Comments Submenu of “Snapshot” Submenu. Reports relative control levels at which RF frequency markers occur. NEXT↓ Sweep drive range = 2031 (-32.60 to 1999) NEXT↓ MARKER #0= -32.60 delta to #1 = 104.9 slope delta=98.85% %NonLIN=0.
Accu-Wave Chapter 9 Security, Service & Diagnostic User Service & Related Items “User Service & Related Items” Menu Display TN Technologies Comments System restart. Does not affect user data ← Exit this menu NEXT↓ EXECUTE CMD→ Re-initializes system including the DSP. Erases temporary memory, but does not affect user-entered setup data. Erase all entries !!! (except COMM setup) ← Exit this menu NEXT↓ EXECUTE CMD→ Erase all previously entered set up data.
Chapter 9 Security, Service & Diagnostics Accu-Wave “User Service & Related Items” Menu (cont.) Display Comments Level hold mode value 15.00 ft level NEXT↓ Enter the hold value for the primary measurement (level or distance). This value is also used as the “lost echo value” when “go to hold value” is selected as the “echo loss mode.” See page 5-8. Hold level at 15.00 ft level ← Exit this menu.
Accu-Wave Chapter 9 Security, Service & Diagnostic Factory Service & Related Items Factory Service & Related Items” Menu [Service only item] Display Comments Program rev # 4.31 11-May-1998 05:33:21 The program revision number and the date/time of the software build. DSP version: REV3.0 13:50:30 18/MAY/96 Before viewing the DSP rev # with direct entry, you must do a command 130 to tell the system to get the data. hardware diagnostics→ Menu subgroup header.
Chapter 9 Security, Service & Diagnostics Accu-Wave Factory Service & Related Items” Menu (cont.) [Service only item] Display Comments signal diagnostics→ Menu subgroup header. See “Signal diagnostics” menu table below. Factory test !!! Erases ALL !!! ← Reject command EXECUTE CMD→ Performs an in-depth test of the system. Test takes several minutes to complete and erases all setup data.
Accu-Wave Chapter 9 Security, Service & Diagnostic View Error Status: Bad NV writes, etc. (Factory Service Submenu) “View Error Status Bad NV writes, etc” Menu Display Comments address 00h failed to clear (00 is OK) NEXT↓ If non-zero, address could not be erased. address 00h write failed verify (00 is OK) NEXT↓ If non-zero, address could not be written correctly. address 00h write to PROM area (00 is OK) NEXT↓ If non-zero, write to PROM address failed.
Chapter 9 Security, Service & Diagnostics Accu-Wave Test relays (Factory Service Submenu) Note: This submenu is not displayed if no relays are installed. “Test Relays” (Factory Service Submenu) [Service Only Item] Display commands 88, 89, 153 relay to test = #1 Comments Enter relay number to test. NEXT↓ test-set relay #1 Test “setting” relay 1 (activate). ← Exit this menu. NEXT↓ EXECUTE CMD→ test-clr relay #1 Test clearing relay #1. ← Exit this menu.
Accu-Wave Chapter 9 Security, Service & Diagnostic Signal Diagnostics (Factory Service Submenu) “Signal Diagnostics” Menu [Service Only Item] Display Comments Do not spec to sweep sig for scope Change to “Do”→ Continue as is.↓ Time shares the sweep control line to the head with the frequency spectrum for use with a scope. A low going pulse on the line is provided for scope trigger. Do not I.F. to sweep sig for scope Change to “Do”→ Continue as is.
Accu-Wave Appendix A Returning Equipment for Service Appendix A How to Return Equipment for Service Call the TN Technical Services Department (Factory Service division) before returning equipment for repair. Many problems can be diagnosed and resolved over the phone. For after hours or weekend service, call our 24-hour Service number: 512-388-9320. With all units returned for repair, please include: • • • Specific information about the problem.
Accu-Wave Appendix B Specifications Appendix B Specifications Operating Principle Frequency modulated continuous wave (FMCW) radar signal which measures distance; microprocessor based transmitter computes level, volume and nine other measurements. Range Up to 115 ft. (35 m.) Reference Accuracy ±3 mm (1/8 in.) Repeatability ±3 mm (1/8 in.) Input Power 24 Vdc ±25%, 12 W Serial Outputs & Inputs RS-485 (Standard): Half duplex partyline communication to a host computer or hand-held terminal.
Accu-Wave Appendix C Menu Flowcharts Appendix C Menu Flowcharts This appendix shows the overall arrangement of the menu groups and the menus contained in each menu group. Use the arrow keys to scroll through the menus. Help texts are available at appropriate points. The dynamic menu system controls the items you see so that only menu selections pertinent to your application are presented. Note: The actual menu display can vary dynamically with context.
Appendix C Menu Flowcharts Accu-Wave Top Level Menu Structure This table describes the top-level menus and references the appropriate chapter in the manual. Each of these menus is then described in a separate table on the following pages. Top Level Menu Structure Display Comments Set up level, level alarms, & volume ← Exit Setup. Other functions→ → See Chapter 3. Primary measurement setup – distance or level. Set up alarm(s) (optional) for the primary measurement and set up tank volume (optional).
Accu-Wave Appendix C Menu Flowcharts “Set Up Level, Level Alarms, & Volume” Menu Group “Set Up Level, Level Alarms, & Volume” Menu Display Comments (primary measurement setup items) Page 3-2. Set up the primary measurement. (current output span / display scaling) Page 3-2. Set up the current output span relative to the primmary measurement. Only displayed if I/O board w/current output is installed. Set up alarm 1 (alarm 2,etc)→ → Page 3-6. Set up alarm(s) for primary measurement.
Appendix C Menu Flowcharts Accu-Wave “Radar Fine Tuning” Menu Group “Radar Fine Tuning” Menu Display Comments material type and measurement head setup→ → Page 5-2. modify range of measurement→ → Page 5-4. Response time, lost echo and agitator reject setup→ → Page 5-6. False echo management→ → Page 5-11.
Accu-Wave Appendix C Menu Flowcharts “Set up Fault Alarms or Change Process Alarm Assignments” Menu Group “Set up Fault Alarms or Change Process Alarm Assignments” Menu Display Comments Set up for alarms to execute commands → Page 6-4. Assign alarms to measurements → Page 6-5. Available only if additional measurements are set up. Alarms must be assigned to non-primary measurements using this item, before alarms can be set up for “non-primary” measurements.
Appendix C Menu Flowcharts Accu-Wave “Set Up Serial Ports, Contact Input, or Special Functions” Menu Group “Set Up Serial Ports, Contact Input, or Special Functions” Menu Display Comments Modify port 1 RS232 configuration → Page 8-8. Modify port 2 RS485 configuration → Page 8-8. Set up port 1 RS232 data transmission → (data streaming) Page 8-10. Set up port 2 RS485 data transmission → (data streaming) Page 8-10. Assign commands to execute on contact open/close 1 (2)→ → Page 8-18.
Accu-Wave Appendix C Menu Flowcharts Glossary • • • • • • • • • • • TN Technologies AC Alternating current. Alarm In this manual, does not necessarily mean an abnormal or dangerous condition exists. Here alarm broadly means that a previously specified condition exists. Alarms can be process, system fault and warning. Alarm clear Condition under which the alarm ceases. Alarm clear point Measurement at which alarm is deactivated or cleared.
Glossary Accu-Wave • • • • • • • • • • • • • Glossary-2 Beamwidth Out going microwaves spread out approximately 15⋅ wide. Board A flat sheet on which integrated circuits are printed. Break point table A table of 1-16 points (distance or level) and the corresponding volume of the tank at that point. Cal Calibration. Cap Top of sensor. Contains transceiver and preamp assembly. Clear point The reading at which the alarm ceases.
Accu-Wave Glossary • • • • • • • • • • • TN Technologies Entry ID Identifies a menu item for direct entry. Esters Any of a class of often fragrant compounds that can be represented by the formula RCOOR’ and that are usually formed by the reaction between an acid and an alcohol with elimination of water. For example: acetate. False echo Echo reflected from any surface other than the surface of the process material.
Glossary Accu-Wave • • • • • • • • • • • • • Glossary-4 MAXECHOS Maximum number of echoes to be processed. Meas. To measure or a measurement. Measurement Any parameter which the gauge is programmed to measure or display. For example, level, distance, or volume. Measurement #1 The primary measurement, either distance or level. Measurement display Shows the current values of distance or level, signal strength, and other measurements that have been set up. Measurement head The sensor.
Accu-Wave Glossary • • • • • • • • • TN Technologies the process material back to the gauge sensor. Refracted wave Only of concern when the process material has a low dielectric and the material level in vessel is also low. Wave train produced when microwaves cross boundary between 2 media (for example, air and process material). Refracted portion of wave is that which crosses into second medium and is not reflected back to sensor.
Glossary Accu-Wave • • • • • Glossary-6 Transmitter Does digital processing. Ullage Empty volume. Units mask Defines which set of measurement units will be displayed. The default is All. Volume Amount of process material measured in the vessel. Gauge measures distance, calculates the level, and converts this to volume based upon the vessel shape you selected in “Set up volume menu.” Vortices Whirlpools of flowing fluid. Areas of lower pressure with fluid flowing in a circular motion.
