© KROHNE 11/2000 DIN A4: 7.02182.37.00 US size: 7.02182.77.
Contents: General advice on safety ................................3 Product liability and warranty .........................3 Items included with supply ..............................3 Software history ..............................................4 1. Range of application ................................6 2. Mode of operation and system structure.6 2.1 Operating principle ...................................6 2.2 Signal processing (digital) .........................7 2.
General advice on safety: • To carry: the device will weigh between approx. 16 kg (35.5 lb) and 30 kg (66.1 lb) or more! To carry, use both hands to lift the device carefully by the converter housing. If necessary, use lifting gear. • When handling the BM 70 A/P, avoid hard blows, jolts, impacts, etc. Product liability and warranty: The BM 70 A/P level gauge is designed solely for measuring the distance, level, volume and reflection of liquids, pastes, slurries, solids and particulate materials.
Software history Signal Converter Firmware For BM 70 A: Introduction Mth./Yr 06/97 01/98 Firmware Version 3.00PREnn 3.00 Device Instructions 06/97 11/97-11/00 05/98 3.01 11/97-11/00 07/99 3.02 05/98-11/00 11/99 3.03 05/98-11/00 Remarks Test versions First serial version. Errors when empty spectrum recorded with WAVE-STICK; automatic reset when signal is extremely weak. Elimination of errors in V. 3.00; improved application of empty spectrum at tank bottom.
Compatibility between PC-CAT Software and BM 70x Level-Radar Instruments Software (1) Operating System BM 70 BM 70 Nautic YES (2) NO YES (3) NO YES NO YES Up to firmw. 3.02/4.02 (5) PC-CAT (DOS) 1.00 PC-CAT (DOS) 2.00 (4) PC-CAT (DOS) 2.10/2.11 (4) PC-CAT (DOS) 2.30 DOS ≥ 3.00 DOS ≥ 3.00 DOS ≥ 3.00 DOS ≥ 5.00 (7) PC-CAT (DOS) 3.00 DOS ≥ 5.00 (7) YES PC-CAT (DOS) 3.01 PC-CAT Windows 4.00/4.01 DOS ≥ 5.00 (7) Windows 95,98,2000,NT Windows 95,98,2000,NT YES NO PC-CAT Windows Lite 4.
1 Range of application The BM 70 A/P Level-Radar level gauging system is designed to measure the distance, level, volume and reflection of liquids, pastes, slurries, solids and particulate materials. It can be operated on storage and process tanks and also on stilling wells. BM 70 P is specially designed for applications on storage tanks with highest precision requirements. BM 70 A/P Ex hazardous-duty versions are suitable for use in Ex-Zone 0, 1 and 2.
PLL structure As the transmit frequency is changed during a short time interval by FMCW radar the transmitted frequency has to follow the nominal frequency within micro seconds. This ensues via modern, fast electronic and processors. Microprocessor Reference control oscillator Microwave Phase oscillator detector Loop filter Antenna 2.2 Signal processing (digital) The radar signals are digitally processed by a microprocessor.
3 Input 3.1 Measured variable (distance, level, volume, reflection) The primary measured variable is the distance between a reference point (as standard: tank mounting flange) and a reflecting surface (e.g. surface of the liquid). The filling level is determined by allowing arithmetically for the entered tank height. Volume measurements are possible by entering a conversion table (max. 50 points).
4 Output 4.
® 4.2 Ex-e current output HART Function Level, distance, volume (conversion table) or reflection, and error identification; galvanically isolated from digital input and switching output Current 4-20 mA; without or with error message (2 mA and 22 mA) Accuracy/linearity 0.05 % (rel. 20 mA; at T = 20°C, 100Ω load impedance and nominal operating voltage) Temperature drift < 100 ppm/K (typically 30 ppm/K) Load impedance < 500 Ω Effect of load impedance < 0.02 % (rel. 20 mA for RB = 0...
® 4.4 HART communication The HART Communications protocol can, in accordance with the Rosemount Standard, be used with a BM 70 A/P. Electrical connection: see Section 7.8. There are two ways of using the HART® Communication: a) As a point-to-point connection between the BM 70 A/P and the HART® master equipment. ® A BM 70 A/P can be used either with an Ex-e current output HART or with an Ex-i current output ® HART . HART Master 4...
Transmission rate: Address: Protocols: V.3.02/4.02) 1200 to 38400 bauds 0 to 255 KROHNE Protocol, Additional current output: Note: ® HART , Modbus RTU (from firmware Additional information: see "BM 70 A/P Communication RS 485" instructions The current output is conductively coupled to the RS 485 interface. Technical data: see Section 4.5 Switching contact and digital input are not available. However, the current output can be configured as a switching output.
• Since signal reflections at the line ends can interfere with Communication, both the line beginning (at the computer system) and the line end (at the last device) should be terminated with the typical surge impedance of the cable (120 Ω). To do this inside the BM 70 A/P: see Section 7.9. 4.7 Breakdown signal Breakdown information can be called up via the following interfaces: • Local display: flashing display, plain text information • Current output: error signal 2 mA (Exi = 3.
5 Measuring accuracy 5.1 Reference conditions • • • • • • • Temperature = +20°C / +68°F Pressure = 1013 mbar abs. / 14.5 psia Air humidity = 65% Highly reflecting product (e.g. water) with calm surface Tank diameter > 5 m / 16.4 ft Mounted at least 1/7 x tank height away from tank edge (BM 70 P: 1/5 x tank height) No interference reflections inside the radiation lobe (± 6...9°; see Section 6.1.1) 5.
BM 70 A Precision (with special calibration and certificate): Only with antenna type 4 (200 mm / 7.87") or stilling well 80 - 200 mm dia. (3 - 8") Accuracy inch cm 4.8 12 10 4 3.2 8 2.4 6 1.6 4 0.8 2 0 0 -0.8 -2 -1.6 -4 -2.4 -6 -3.2 ± 0.1 % ± 5 mm (0.2") -8 -4 -10 -4.8 -12 0 5 16 1 block 3 distance 10 33 15 49 20 66 Distance to flange 25 82 = calibration range 30 98 35 115 40 m 131ft = not verified by calibration BM 70 P Only with antenna type 4 (200 mm / 7.
5.5 Transient recovery time The transient recovery time is determined by the setting parameter "time constant" (1 ... 100 s). The transient recovery time relative to 1% deviation from the steady-state value is approx. 4.6 times the time constant. However, in the case of unusually rapid changes in level, the transient recovery time may deviate from this figure. 5.6 Turn-on drift / turn-on characteristics A rough measured value is initially displayed about 1 minute after the BM 70 A has been switched on.
6 Operating conditions Hazardous-duty systems • The BM 70 A/P is certified in conformity with European Standard (ATEX) for use in Zone 0, 1 and 2 hazardous locations. • The BM 70 A/P also has FM Approval (Factory Mutual) for CLASS I, DIV 1, GROUPS B,C,D; CLASS II/III, DIV 1, GROUPS E,F,G. • Attention is drawn to the information given on the approval certificates.
6.1.2 Recommendations for positioning on the tank A) Horn antenna or Wave-Stick without stilling well Antenna Type 3 or Wave-Stick Recommended distance from the tank wall: >1/7×H, but max. 1/3×D Antenna Type 4 H >1/10×H, but max. 1/3×D BM 70 P : > 1/5 x H H D D min. measurable level Lower measuring range limited when tank has tapered bottom. Do not position in tank centreline! (multiple reflections!) Several BM 70 A/P can be operated in one tank.
B) Stilling well or Wave-Guide A stilling well or Wave-Guide may be mounted in any position on the tank. (For design layout: see also Section 6.1.4; for block distance: see Section 3.3). Stilling well application In a side vessel BM 70 A Wave-Guide A stilling well or Wave-Guide is positively recommended for horizontal cylindrical tanks (to avoid multiple reflections): 6.1.
An antenna extension should be added if the antenna does not project out of the fitting: Antenna extension Tank nozzle Antenna extensions are available from 100 to 2000 mm (3.94" to 78.74") in steps of 100 mm (3.94"). Several extensions can be joined up: Exception: When the tank fitting is sy mmetrical, the antenna may end in the fitting so as to enlarge the measuring range (minimum dead zone to tank cover, see Sect. 3.3 "block distance" and Sect. 5.
B) Wave-Stick Note the requirements pertaining to diameter and length of the tank fitting: Version Length L max. height of fitting X 384 mm 150 mm (15.12”) (15.12”) 500...1000 mm L - 234 mm (19.7” - 39.4”) (L - 9.2”) max. X Tank nozzle Standard min. 50 mm/2" L Option 6.1.4 Mounting on stilling wells Antenna Type 1 1s 2, 2s 3 3s 4, 4s Outside diameter 80 mm (3.15”) 76 mm (2.99”) 100 mm (3.94”) 140 mm (5.51”) 152 mm (5.98”) 200 mm (7.
It is possible to measure through a full-bore open ball valve if the valve and the pipe adapters above and below the valve are relatively smooth-walled. • It is not possible to measure levels below the end of the stilling well. • To ensure equalization of pressure, drill one or two small holes in the stilling well above the maximum filling level. • If necessary, several holes can be drilled along the whole length of the pipe. All holes must be deburred.
6.1.7 Special options for the flange Antenna heating/cooling device (> DN150/6") Double-walled antenna for cooling or heating, e.g. to avoid condensation (recommended for liquid sulphur). max. differential pressure at antenna: Standard DN150 = 6 bar (87 psig) (information on other pressure levels provided on request) Hazardous-duty systems: 1. In Zone 0, the temperature of the heating system and antenna may not exceed 80 % of the ignition temperature of the stored material. 2.
6.1.9 Sunshade 315 (12.40") 353 (13.89") A sunshade SD is recommended to protect the signal converter from the effects of direct sunshine from above. This will increase the overall installation height by approx. 20 mm. The sunshade is easily fitted/dismantled with the aid of 4 screws S (included). An Allen key (size 4 mm) is required.
6.2 Ambient conditions 6.2.1 Hazardous locations BM 70 A/P Ex is suitable for use in hazardous locations of the following zones: 0, 1, 2 Temperature classes: T6...T2; danger groups: IIA...IIC For further information: see Section 10. 6.2.2 Ambient temperature of signal converter BM 70 A/P with horn antenna or Wave-Guide: -20 ... +55°C (-4 ... +131°F) A "BM 70 sunshade" should be fitted if the converter is located in the open with the likelihood of strong insolation (see Section 6.1.9). 6.2.
6.2.8 Shock resistance The device has been found to withstand the impact test in conformity with EN 61010, Section 8.2, with 0.5 J energy, and the drop test to prEN 50178:1994. 6.2.9 Vibration endurance limit Type test conditions: to IEC 68-2-6 and prEN 50178 (10-57Hz: 0.075 mm / 57-150 Hz: 1 g) 6.2.10 EMC The devices satisfy the requirements of EN 50081-1, EN 50082-2 and the NAMUR Recommendation. 6.3 Product conditions 6.3.
6.3.3 Product limitations Radar-based level measuring devices are not suitable for the following products: • liquid a mmonia (NH3) • liquid hydrogen (H2) • liquid helium (He) 6.3.4 Product temperature (unrestricted) The product temperature is not a relevant factor, provided the ambient temperature (see 6.2.2) and the flange temperature (see 6.2.3) are within the specified limits. 6.3.5 maximum allowable operating pressure (max.
7 Design Hazardous-duty systems The BM 70 A/P-Ex is approved to European Standard EN 50014/18/19/20 for use in hazardous locations of Zones 0, 1 and 2. • Electronics compartment: Flameproof Enclosure "d" • Terminal compartment: Increased Safety "e" for signal output and power supply Optionally: Intrinsic Safety "i" for the signal output and Increased Safety "e" for the power supply.
7.2 Dimensions and Weights Basic version: High-temperature version: 313 (12.32") 226 (8.89") 313 (12.32") 214 (8.42") 226 (8.89") f 420 (16.54") 176 (6.
7.3 Replacement of the signal converter Always disconnect from power source before commencing work! Hazardous-duty systems Before replacing the signal converter (instrument "head") in the hazardous location, make absolutely certain that there is no explosion hazard (gas-free certificate). Allow the prescribed waiting time of 22 minutes to elapse before opening the housing! 1. Remove safety lock (see Sect. 9.
7.5 Selection of antenna type and size This BM 70 A recommendation for the optimum application range is based on application experience and designed to minimize potential problems. If the recommended antenna is unacceptable, any other configuration may also be tested. Type 1 and 2 antennas should only be used with stilling wells. For BM 70 P always antenna type 4 or a stilling well > 100 mm / 4" is recommended.
7.6 Materials of construction Check the materials of the antenna, extension, flange, gaskets, and PTFE (contained in all versions) for compatibility with the product! 7.6.1 Signal converter Housing: Aluminium with electrostatic powder coating to DIN 55990-3. Sight window: Glass 7.6.2 Flange system (Antenna, extensions and flange or flange plating) Available materials for BM 70 A/P flange systems (in contact with the product): DIN No. Versions mit horn antenna or Wave-Guide: Stainless steel 1.
7.8 Electrical connection The electrical connection for supply power and signal inputs/outputs is made in the terminal compartment (Ex-e) of the signal converter. Observe requirements specified in VDE 165, and consult the safety advice given in Section 9.4. In the BM 70 A/P version with intrinsically safe signal output, only certified intrinsically safe equipment may be connected to the blue terminals, even if the device is not operated in the hazardous area! Terminals: conductor cross-section 0.5 - 2.
Ex-i Current output HART® with switching output: Current output (non-communicable): Switching output max. 110mA/30V Current output unassigned Currentoutput 32 31 - + 42 41 32 31 - + U min. = 8V + - + U max.= 30V 4-20mA max.250 Ω 4-20mA - Ex-i-supply unit + RS 485 version: PROFIBUS-PA or Foundation Fieldbus (FF) Current output B B A A 32 31 32 31 - + + Busconnection RS 485 input RS 485 output 4-20mA max.
8 User interface 8.1 Local display In the versions with local display at the BM 70 A/P signal converter, configuration can be carried out directly at the device. If a local display is not featured, the PC-CAT program (see Sect. 8.12) must be used to change the parameter setting (assuming a communicable interface is provided). Two variants of the display are available: - Standard display with 2-line LCD display (7 mm high digits for the measured value).
8.2 Function of the keys The three keys have the following functions: → (Cursor key): - selects the configuration menu, - branches the menu to the next lower level, - moves the cursor* to the right to the next column. ↑ (Select key): - branches the menu to the next digit in the same level, - changes the content (digit, character) at the cursor* position.
8.3 Operator control concept main menu column Submenu column Functions column Data column Measuring mode 627 cm 3.0 INSTALL. 3.6 SW.OUTPUT.S 3.6.1 - 3.6.4 3.5 APPLICAT. 3.5.1 - 3.5.9 3.4 USER DATA 3.4.1 - 3.4.4 3.3 SIGNAL OUTP. 3.3.1 - 3.3.7 3.2 DISPLAY 3.2.1 - 3.2.5 3.1 BASIS.PARAM 3.1.1 - 3.1.8 2.4 FIRMWARE 2.4.1 - 2.4.2 2.3 SW.OUTP.S 2.3.1 2.2 CUR.OUTP.I 2.2.1 - 2.2.2 2.0 TEST 2.1 HARDWARE 2.1.1 - 2.1.3 1.0 OPERATION 1.1 DISPLAY 1.1.1 - 1.1.
Examples of key functions The cursor (flashing part of display) is shown boxed in by dotted lines in the following description.
8.4 Table of settable functions (Versions 3.00, 3.01, 3.02, 3.03, 4.02, 4.03) Function (Fct.) Enter range 1.0 OPERATION 1.1 DISPLAY 1.1.1 FCT.DISP Options 1.1.2 UNIT.LENGTH Options 1.1.3 UNIT. CONV. Options 2.0 2.1 2.1.1 2.1.2 2.1.3 Special function Special function Options TEST HARDWARE MASTER DISPLAY STATUS 2.2 CUR.OUTP.I 2.2.1 VALUE I 2.2.2 TEST I 2.3 SW.OUTPUT 2.3.
Function (Fct.) Enter range 3.1.6 STILLWELL Options NO YES Default value Description NO Select: with or without stilling well. If "YES": Enter (restraint) STILLWELL DIA. 25 ... 200 [mm] 3.1.7 REF.OFFSET Enter When "YES" selected, the inside diameter of the stilling well is additionally entered in [mm]. 100 mm 0.00 m To input the reference offset (relocation of the upper reference point). To input the tank bottom offset (relocation of the lower reference point). -10.00 ... + 10.00 [m] 3.1.8 TB.
Function (Fct.) 3.4 Enter range Description GB/USA * Select language to be used in the display (English, German, French, Italian, Spanish, Portuguese, Swedish) Switch the access lockout for the configuration menu on/off. Input of the Entry Code. Input of a max. 8-character device identifier. USER DATA 3.4.1 LANGUAGE Options GB/USA, D, F, I, E, P, S 3.4.2 ENTRY CODE 1 Options NO YES 3.4.3 CODE 1 3.4.4 LOCATION Enter code Text 3.5 APPLICAT. 3.5.1 AUTO TANKH. 3.5.2 EMPTY.SPEC.
8.5 Configuration examples upper reference point (top edge of tank connecting flange) Fct. 3.1.5 Fct. 3.1.4 block distance (Fct. 3.1.2) response threshold tank height (Fct. 3.1.1) + + + + + + + + + + + + + + + + nonmeasurable zone + + + + + + + + + + + + + + + + 20 Imax mA (Fct. 3.3.4) measuring range current output 4 mA Sump Imin (Fct. 3.3.3) lower reference point (tank bottom / datum point) 8.5.1 Level measurement (example) Tank height (Fct. 3.1.1): Antenna extension (Fct. 3.1.
8.5.2 Volume measurement (example) • In order to be able to measure volume with the BM 70 A/P, a conversion table (volume table) needs to be compiled with the PCCAT program (see Sect. 8.12). • By means of the volume table, various levels are allocated to specific volumes previously calculated or measured out. • In the case of non-sy mmetrical tanks, e.g. tanks with dished bottom, the accuracy of volume measurement will depend on the number of set "level/volume pairs".
8.6 Description of functions 8.6.1 Choice of units Level/distance units Select under Fct. 3.1.1 TANKHEIGHT • m • inch • cm • Ft • mm The unit selected here is also valid for the following functions: - Block distance Fct. 3.1.2 - Antenna extension, Fct. 3.1.4 - Scaling 4 mA value, current output, Fct. 3.3.3 - Scaling 20 mA value, current output, Fct. 3.3.4 - Range for partial tank bottom tracing, Fct. 3.5.2 - Threshold (limit value), switching output, Fct. 3.6.3 - Hysteresis, switching output, Fct. 3.
8.6.3 Block distance, antenna type and antenna extension datum plane for distance O-Ref (+) DS Bottom edge of flange AV BD H distance Product surface Level tank bottom O-TB (+) H BD AV - tank height - block distance - Antenna extension DS - distance piece O-Ref - reference offset O-TB - tank bottom offset Fct. 3.1.1 [0.00 m ... max. tank height] Fct. 3.1.2 [0.10 m ... Tank height] Fct. 3.1.4 [0.00 m ... Tank height] Fct. 3.1.5 [0 ... 2000 mm] Fct. 3.1.7 [ -10.00 ... + 10.00 m] Fct. 3.1.
8.6.5 Stilling well Fct. 3.1.6 STILLWELL If the device is operated with a stilling well, the option Stilling well = YES and the inside diameter of the pipe should be entered here in mm. • NO : operation without stilling well • YES : operation with stilling well If YES has been selected, proceed with ↵ and enter the inside diameter: • Setting range: 25 ... 200 mm • Default value: 100 mm If the diameter of the stilling well is greater than 200 mm, enter the maximum value = 200 mm.
8.6.7 Display Fct. 3.2.1 (or Fct. 1.1.1) FCT.DISP. This function is used to select the measured variable. • • • • LEVEL DISTANCE CONVERSION REFLECTION } Measuring range, see Figure in Sect. 8.5. If the conversion value is to be displayed, a conversion table must be progra mmed first otherwise a parameter error will occur. Fct. 3.2.2 (or Fct. 1.1.2) UNIT.LENGTH Use this function to select the unit for displaying level and distance.
8.6.9 Communication interfaces Fct. 3.3.5 BAUDRATE • This function defines the transmission rate for RS 485 Communication. • 1200 Bd. • 2400 Bd. • 4800 Bd. • 9600 Bd. • 19200 Bd. • 38400 Bd. Default value = 19200 bauds • For devices with PROFIBUS-PA (Ex-i) output the value has been set to 31250 bauds. and cannot be changed. • The value set here is not relevant for digital Communication via the current output (e.g. HART®). For this, 1200 bauds are on principle processed, independent of the setting in Fct.
8.6.10 Display Language of display texts A choice of languages for the display texts is offered in Fct. 3.4.1. • GB/USA English y E Spanish (Español) • D German y P Portuguese • F French y S Swedish • I Italian If the message: NO MEAS.VAL. appears, this means that the quality of measurement is not adequate (inadequate bottom reflection or too many interferences) for automatic determination of the tank height. Press key ↵ to abort the operation.
8.6.12 Empty spectrum What is an empty spectrum ? • Fixed and moving internals in the tank (including perhaps the tank wall) produce interference signals (reflections) that can result in incorrect measurements. • To enable the BM 70 A/P to identify and blank out such interference signals, the tank profile (empty spectrum) needs to be recorded once only prior to (initial) startup. • For this purpose, the tank should if possible be completely empty and all moving parts (e.g. agitators) switched on.
FCT. 3.5.2 EMPTY.SPEC. Under this function the empty spectrum is activated or deactivated, or recorded and stored. The display first gives information as to whether the empty spectrum is currently switched ON or OFF. You can then choose between: • OFF: The empty spectrum is not considered for measurements but remains stored in the BM 70 A/P and can be activated again at a later date. • ON: The empty spectrum is (again) activated and considered for measurements.
Fct 3.5.6 BD-DETECT. • NO • YES (default) To activate the block distance (overfill) detector: So long as a significant signal is detected within the block distance, the measured value is "held" at the block distance limit. This avoids any possibility of the measured value skipping to a multiple reflection should the level rise into the block distance range. The block distance can have a value that is at least equal to that specified in Sect. 8.6.
8.6.16 Tank type, movement of product surface 8.6.17 Switching output For optimum results, data acquisition and evaluation must bematched to typical tank characteristics: movement of the product surface, rapid or slow changes in the product level, agitators, etc. The functions for the switching output can be applied to: a) the additional switching output in the Version "Ex-e or Ex-i current output HART®", or b) the current output if Fct. 3.3.1 FUNCTION I is set to "SW.OUTP.". Fct. 3.5.
Switching output characteristics FUNCTION S: LEVEL Fct. 3.6.1 DISTANCE CONVERSION REFLECTION Overflow = Threshold + Hysteresis / 2 HYSTERESIS Fct. 3.6.4 THRESHOLD Fct 3.6.3 Underflow = Threshold + Hysteresis / 2 TYPE S Fct. 3.6.2 Switching output Sw.output application Examples see Sect. 8.
8.7 Functional checks 8.7.1 main menu 2.0 Test functions Function (Fct.) Input range 2.0 TEST 2.1.0 HARDWARE 2.1.1 MASTER Special function Test of master hardware. 2.1.2 DISPLAY Special function Test of display hardware. 2.1.3 STATUS Select Module DIS Module MW Display of ID Number and status bytes. 2.2.1 VALUE I Display of value 2.2.2 TEST I Options Display of actual value of the current output. Output of selected value to the current output. 2.2.0 CUR.OUTP.
8.8 Pointers and error messages during measurement 8.8.1 Different kinds of messages a) Pointers (operating conditions) during measurement provided by 6 markers the display, see Sect. 8.8.2. in the 3rd (bottom) line of b) Application errors, indicating an application error condition in which no valid measured values are currently established. By changing the tank conditions (e.g. filling) this error can usually be remedied, see "Error list" in Sect. 8.8.3.
8.8.3. Error messages and their representation in display and at outputs The following list gives all error messages that can occur: Error messages Type (Sect . 8.8.1) Description of error To correct device fault Text In 2nd line of display Output of errors via display and outputs, depending on setting Display ERROR MSG. Fct. 3.2.4 Current output I RANGE I Fct. 3.3.2 Switching output S FUNCTION S Fct. 3.6.1 b) NO M.
8.9 Messages on start-up When the BM 70 A/P is powered it will take about 1 minute before the first measured value is displayed (see also Sect. 5.6). During this time the following flashing messages appear in sequence in the display: STARTUP - READY - START. After a short line failure (lasting up to several minutes) it is possible that "LINE INTERRUPT" will be displayed. In such a case, measurement is continued subsequently taking into account the history prior to the interruption. 8.
A3 A4 The measured value at the current output is incorrect, but the measured value in the BM 70 A/P display is correct. Data Communication via the digital interface not functioning. Settings of the current output are incorrect. Set current output correctly as described in Sect. 8.6.8 (Fct.3.3.1 - 3.3.4). Communication interface set incorrectly. The computer system for Communication with the BM 70 A/P is incorrectly configured. Incorrect connection to the interface.
Group DA Display and signal output No. Fault / Symptom Cause DA10 Display and signal output frequently Excessive amounts of vapour, indicate the maximum level. condensate or dust in the tank, or heavy contamination (deposits thicker than approx. 3 - 7 mm or 0.1" - 0.3") on the antenna. Antenna cleaning operations cause strong reflections. DA11 Display and signal output indicate sizeable step changes in the direction of the maximum (possibly also mimimum) level.
Group S Switching output No. Fault / Symptom S1 Switching output does not operate at the desired limit value (threshold) or does so in the wrong mode (opens/closes). S2 Switching output does not operate. Cause Setting of switching function is incorrect. Corrective action Set switching output correctly as described in Sect. 8.6.17 (Fct. 3.6.1 3.6.4). Switching output defective. Check switching output as described in Sect. 8.7.4: - Test OK: check setting and receiver instruments.
8.12 User program PC-CAT for Windows Our instruments of the BM 70 product line are easy to install. To facilitate configuration, each unit is supplied with the intuitive and time-tried software, PC-CAT for Windows.
9 Power supply 9.1 Options, technical data A choice is offered of 2 supply power versions: Version Voltage U 24V DCAC 24 V DC 24 V AC 115/230V AC 115 V AC 230 V AC Tolerance = voltage Frequency range -25% 18-31.2 V +30% -25% 18-26.4 V 45-66 Hz +10% -25% 85-127 V 45-66 Hz +10% -25% 170-254 V 45-66 Hz +10% Power (typical) * 7.5 - 10 W 10 VA max. ripple / harmonics within limits of tolerance 10% 12 VA 10% 12 VA 10% * Hazardous-duty limit: 20W / 40 VA 9.
4.1 Replacement of power fuse(s) Location of fuses: see drawings below. Use only the specified types. 4.2 Changeover of operating voltage (AC Version only) Through a different orientation of the voltage selector switch on the "line" board you can switch over between 115 V AC (85-127V) and 230 V AC (170-254V). For this purpose, pull the plug next to the fuse holders up and out (see drawing below), turn it 180° and plug it back into the holder. Also change the two fuses F2 and F3 to suit the selected voltage.
24 V DCAC supply When connected to a "functional extra-low voltage with safety separation" power source (SELV or PELV) in accordance with VDE 0100, Part 410 or equivalent (inter)national regulations, connection of a safety conductor (PE) is not required.
10 Certificates and approvals 10.1 Hazardous-duty approvals Country Germany/Europe Authority Certificate No. PTB PTB99 ATEX 2061X USA FM J.I.3000813 USA FM J.I.3006165 Canada Japan CSA RIIS in preparation in preparation Class EEx de IIC T6..T1 (Z.0) EEx de [ia]/[ib] IIC/IIB T6..T3 (Z.0) I Div.1 Gr.B/C/D II/III Div.1 Gr.E/F/G I/II/III Div.2 Gr. B/C/D/F/G I Div.1 Gr.B/C/D II/III Div.1 Gr.E/F/G I Div.2 Gr. A/B/C/D II/III Div.2 Gr. P/G Device type BM 70 BM 70 i BM 70 BM 70 BM 70.i BM 70.i BM 70.
10.3 Explosion proof acc. to ATEX The instruments BM 70 A, BM 70 P and BM 700/702 are approved according to the new hazardous area directives ATEX 100a (certificate: PTB 99 ATEX 2061X).
10.4 Radio approval Gazette 129, 20.11.1989 TeleCommunications Decree 1117/1989 General licence No. 353 for radio transmitting and receiving installations The installation and operation of the radio transmitting and receiving system "BM 70 Level Radar" and "BM 70-Ex Level Radar"manufactured by Firma KROHNE Messtechnik GmbH & Co. KG, 4100 Duisburg, for telecontrol purposes (level gauging in metal tanks) at a frequency in the 8.1 - 9.
10.5 CE Manufacturer's declaration DECLARATION OF CONFORMITY We, KROHNE Messtechnik GmbH & Co.
11 Order information Technical information relevant to the order BM 70 A/P Level-Radar ♦ Connecting flange: ................... ________________________________________________ ♦ Flange and antenna material:... ________________________________________________ ♦ Waveguide seal: ...................... Viton FFKM Kalrez2035 Other _____________ ♦ Antenna type:........................... Type 4 (200 mm) Type 3 (140 mm) ................................................
12 External standards, codes and directives DIN V 19259: 1996-10. Documentation of devices, Data types with classsification scheme for measuring equipment with analog or digital output for industrial process measurement [in German] VDI/VDE 3519 (part 2): 1994-12. Level measurement of liquids and solids (bulk solids) [in German] DIN VDE 0165: 1991-02. Installation of electrical apparatus in hazardous areas [in German] DIN EN 50014: 2000-02.
Annex A: Technical data 1 Range of application Distance, level, volume and reflection measurement of liquids, pastes, slurries, solids and particulate material on storage and process tanks or containers made of metal or concrete, and also in stilling wells 2 Mode of operation / system structure FMCW-Radar in the X-Band (8.5-9.
Horn antenna, Wave-Guide (Tamb ≤ 55°C/131°F): High-temperature version with: - FFKM gasket (Kalrez 4079/Parofluor V8545-75): - Kalrez 2035 gasket: - Viton gasket: - FEP-sheathed gasket: Wave-Stick: Environment class Protection category Shock resistance Vibration endurance limit EMC 6.3 -30...+120°C (-22...+248°F) -30...+250°C (-22...+482°F) (safety limit 280°C/536°F) -30...+210°C (-22...+410°F) -30...+200°C (-22...+392°F) -30...+200°C (-22...+392°F) -20...+100°C (-4...
Annex B: Type code / nameplates Type code See nameplate on signal converter and flange system (places not needed in the type code may be omitted): BM70 . . / . / .
- Flange system WS LPTFE : PTFE conductive PTFE : PTFE non-conductive SS PTFE : stainless steel / PTFE non-conductive SS PP : stainless steel / PP non-conductive - Flange system EA EM PTFE : Enamel + PTFE (4) Field of application, Device Group II 1G : Category 1G (application in Zone 0) 2G : Category 1G (application in Zone 0) Informationen on nameplates (example) Signal converter: Manufacturer Version European conformity Type acc. to type code 0102 Sales order number Firmware version no.
Sanitary connection / G 1 ½“ thread: Operating temperature Operating/test pressure Year of manufacture Serial number Type acc.
Annex C: Spare parts Installation and operating instructions BM 70 A/P Page: 77 11/00
Installation and operating instructions BM 70 A/P Page: 78 11/00
Installation and operating instructions BM 70 A/P Page: 79 11/00
Annex D: Signed declaration to accompany a device returned to KROHNE If you need to return level gauges for testing or repair to KROHNE If installed and operated in accordance with these operating instructions, your level gauge will rarely present any problems. Should you nevertheless need to return a device for checkout or repair, please pay strict attention to the following points.
Annex E: Table on documentation of device configuration CHECK LIST PARAMETERS BM 70 A/P.Vers.:.............. Date: ............... Device No. ..................................................: Comm. No.... :....................... ........................ Location......................................................: ...................... ........................ ........................ Contact person...........................................: Telephone.... ........................ : ................
Annex F: Index Address Agitator Ambient temperature Antenna extension Antenna size Antenna type Application range Approvals Assembly Baud rate Block distance Block distance detection BM 70 A Precision Breakdown information Cable entries Configuration Configuration menu Connecting cable Connection diagrams Conversion table Cooling device Current output Curved extension Cylindrical tank Device configuration Digital Communication Digital input Dimensions Display Distance piece Documentation Electrical connecti
Protocol Purging device Quality assurance Reference conditions Reference offset Reflection Rel. Permittivity Repeatability Replacement of signal converter Returning the device RS 485 Safety conductor Safety lock Safety, advice on Setting, see Configuration Shielding strip Side vessels Signal converter Signal output Signal processing Software history Spare parts Spectrum Standards Stilling well 8.6.
