DOTX-45 Dissolved Oxygen Transmitter
Table of Contents PART 1 - INTRODUCTION ............................................................................................................................... 4 1.1 1.2 1.3 1.4 1.5 General ................................................................................................................................................... 4 Standard System ..................................................................................................................................... 4 Features .
6.24 Configuration Menu [CONFIG]........................................................................................................ 34 6.25 Control Menu [CONTROL].............................................................................................................. 37 Figure 6-3 Control Relay Example, Hysteresis and Two opposite Phase Options ..................................... 40 Figure 6-4 Alarm Relay Example ...................................................................................
Part 1 - Introduction 1.1 General The Model DOTX-45 is a highly versatile on-line monitoring system designed for the continuous measurement of dissolved oxygen in solution. The full scale operating range of the system 0-40 ppm, and the sensing system will operate on water streams with temperatures ranging from 0 to 50°C. The basic sensing element used in the dissolved oxygen monitor is a galvanic membrane sensor which measures oxygen directly.
DOE-45PA/DOTX-45 Dissolved Oxygen System Part 1 – Introduction • AC power option provides dual SPDT relay operation and one additional isolated analog output. Software settings for relay control include setpoint, deadband, phase, delay, and failsafe. Software controls automatically appear in menu list when hardware option card is plugged in and system power is applied. • Selectable PID controller on main analog output.
DOE-45PA/DOTX-45 Dissolved Oxygen System 1.4 Part 1 – Introduction System Specifications (Common to all variations) Displayed Parameters Main input, 0.1 ppm to 40.0 ppm %Saturation, 0 to 999.9% Sensor temperature, -10.0 to 50.0°C (23 to 122ºF) Sensor signal, -40 to +2000 mVDC Loop current, 4.00 to 20.00 mA Sensor slope/offset Model number and software version PID Controller Status Main Parameter Ranges Manual selection of one of the following display ranges, 0.00 to 40.00 ppm 0.00 to 40.00 mg/l 0.
DOE-45PA/DOTX-45 Dissolved Oxygen System Part 1 – Introduction Sensor 2-electrode galvanic membrane sensor for direct measurement of oxygen, Sensor Materials Noryl, PVC, and stainless steel Sensor Cable Submersible: 15 ft. (4.6 m) or 30 ft. (9.1 m) Flow Sensor: 25 ft. (7.6 m) cable with 6-pin plug. Max.
DOE-45PA/DOTX-45 Dissolved Oxygen System Analog Outputs 1.5 Part 1 – Introduction Two 4-20 mA outputs. Output one programmable for PPM oxygen or PID. Output 2 programmable for PPM or mg/L oxygen, % saturation, or Temperature. Max load 550 Ohms for each output. Outputs ground isolated and isolated from each other. Performance Specifications (Common to all variations) Accuracy 0.2% of selected range or better Repeatability 0.05% of selected range or better Sensitivity 0.
Part 2 – Analyzer Mounting 2.1 General The DOTX-45 system offers maximum mounting flexibility. A bracket is included with each unit that allows mounting to walls or pipes. In all cases, choose a location that is readily accessible for calibrations. Also consider that it may be necessary to utilize a location where solutions can be used during the calibration process.
DOTX-45 Dissolved Oxygen System Part 2– Analyzer Mounting Figure 2-1 Enclosure Dimensions, AC Powered Units DOTX-45 10 -
DOTX-45 Dissolved Oxygen System Part 2– Analyzer Mounting Figure 2-2 Enclosure Dimensions, 2-Wire Units DOTX-45 11 -
DOTX-45 Dissolved Oxygen System 2.2 Part 2– Analyzer Mounting Wall or Pipe Mount A PVC mounting bracket with attachment screws is supplied with each transmitter (see Figure 2-3 for dimensions). The multi-purpose bracket is attached to the rear of the enclosure using the four flat head screws. The instrument is then attached to the wall using the four outer mounting holes in the bracket. These holes are slotted to accommodate two sizes of u-bolt that may be used to pipe mount the unit.
DOTX-45 Dissolved Oxygen System M ENU ES C Figure 2-4 Part 2– Analyzer Mounting E N T ER Wall Mounting Diagram M EN U E SC E N T ER Figure 2-5 Pipe Mounting Diagram DOTX-45 13 -
DOTX-45 Dissolved Oxygen System 2.4 Part 2– Analyzer Mounting Panel Mount, AC Powered Monitor Panel mounting of an AC powered monitor uses the panel mounting flange molded into the rear section of the enclosure. Figure 2-6 provides dimensions for the panel cutout required for mounting. The panel mounting bracket kit must be ordered separately.
Part 3 – Sensor Mounting 3.1 General Select a location within the maximum sensor cable length for mounting of the sensor. Locating the sensor within 25 ft. of the transmitter is generally preferred for ease of operation and calibration. 3.2 Submersion Mounting Most applications for D.O. monitoring are done using a submersible sensor. This method can be used where flow is reasonably constant, and hydraulic head does not vary more than about 10 feet.
Part 4 – Electrical Installation 4.1 General The DOTX-45 is powered in one of two ways, depending on the version purchased. The 2-wire version is a 16-35 VDC powered transmitter. The integral 115 VAC version requires line power. Please verify the type of unit before connecting any power. WARNING: Do not connect AC line power to the 2-wire module. Severe damage will result. Important Notes: 1. Use wiring practices that conform to all national, state and local electrical codes.
DOTX-45 Dissolved Oxygen System Figure 4-1 Part 5 – Sensor Assembly Loop-Power Connection Notes: 1. Voltage between Terminals 9 and 10 MUST be between 16 and 35 VDC. 2. Earth ground into Terminal 12 is HIGHLY recommended. This connection can greatly improve stability in electrically noisy environments.
DOTX-45 Dissolved Oxygen System Figure 4-2 4.21 Part 5 – Sensor Assembly Submersible Sensor Connection Load Drive The amount of resistance that the analog output can drive in the 115 VAC version is fixed. However, in the two-wire configuration, the load-drive level is dependent on the DC supply voltage provided to the controller. The two-wire instrument can operate on a power supply voltage of between 16 and 35 VDC.
DOTX-45 Dissolved Oxygen System Part 5 – Sensor Assembly (Power Supply Voltage - 16) .02 = RMAX For example, if the power supply voltage is 24 VDC, first subtract 16 VDC, then divide the remainder by .02. 8/.02 = 400; therefore, a 400 Ohm maximum load can be inserted into the loop with a 24 VDC power supply. Similarly, the following values can be calculated: Power Supply Voltage (VDC) 16.0 20.0 24.0 30.0 35.0 4.
DOTX-45 Dissolved Oxygen System Part 5 – Sensor Assembly The analog outputs from the system are present at terminals TB1 and TB2. The loop-load limitation in this configuration is 500 Ohms maximum for each output. Also note that these two outputs are completely isolated from each other to insure that ground loops do not result from the connection of both outputs to the same device such as a PLC or DCS.
DOTX-45 Dissolved Oxygen System Part 5 – Sensor Assembly Two sets of SPDT relay contacts are provided on the power supply board. None of the relay contacts are powered. The user must supply the proper power to the contacts. For applications that require the same switched operating voltage as the DOTX-45, power may be jumpered from the power input terminals at TB5. Relay wiring is connected at TB3 as shown below. Note that the relay contact markings are shown in the NORMAL mode.
DOTX-45 Dissolved Oxygen System Part 5 – Sensor Assembly Cord-grips used for sealing the cable should be snugly tightened after electrical connections have been made to prevent moisture incursion. When stripping cables, leave adequate length for connections in the transmitter enclosure as shown below. The standard 25 ft. sensor cable normally supplied with the system is already stripped and ready for wiring.
DOTX-45 Dissolved Oxygen System Part 5 – Sensor Assembly Part 5 – Sensor Assembly 5.1 Oxygen Sensor Preparation The oxygen sensor supplied with the DOTX-45 is shipped dry. It will not operate until it is prepared by adding electrolyte and a membrane. Preparation of the sensor for operation must be done carefully. The procedure should be done by a qualified technician, and it should only be done when the system is ready for operation.
DOTX-45 Dissolved Oxygen System Figure 5-2 Part 5 – Sensor Assembly Submersible Sensing Module Assembly Follow the procedure below to prepare the D.O. sensor module for operation: 1. Unscrew the electrolyte chamber from the assembled sensor and also remove the vent screw from the side of the sensor body. 2. Remove the front nut from the bottom of the chamber and discard the protective membrane. O-rings are contained in grooves on both the bottom and top of the chamber.
DOTX-45 Dissolved Oxygen System Part 5 – Sensor Assembly 6. Slowly screw the chamber onto the sensor body. A small amount of electrolyte will run out of the hole from which the vent screw was removed. Place a paper towel around the sensor to absorb the electrolyte overflow. The electrolyte is harmless and will not irritate skin. Tighten the chamber until the o-ring at the top of the chamber is compressed. Once again, do not use tools to tighten. 7.
Part 6 – Configuration 6.1 User Interface The user interface for the DOTX-45 instrument consists of a custom display and a membrane keypad. All functions are accessed from this user interface (no internal jumpers, pots, etc.). When power is first applied, you may notice that the display does not come on immediately. This is normal. There is a 5 second start routine that runs before the display illuminates. In addition, you will notice an occasional “flicker” of the display, occurring about twice an hour.
DOTX-45 Dissolved Oxygen System 6.11 Part 6 – Configuration Keys All user configurations occur through the use of four membrane keys. These keys are used as follows: 6.12 MENU/ESC To scroll through the menu section headers or to escape from anywhere in software. The escape sequence allows the user to back out of any changes in a logical manner. Using the escape key aborts all changes to the current screen and backs the user out one level in the software tree.
DOTX-45 Dissolved Oxygen System Lower Line Part 6 – Configuration During normal operation, the lower line of the display indicates user-selected secondary measurements that the system is making. This also includes calibration data from the last calibration sequence and the transmitter model number and software version. During configuration, the lower line displays menu items and set-up prompts to the user. Finally, the lower line will display error messages when necessary.
DOTX-45 Dissolved Oxygen System Relay Area A/B 6.2 Part 6 – Configuration The relay area contains two icons that indicate the state of the system relays (if the relay card is installed). If the battery board is installed instead, the B icon indicates that the battery voltage is at a low level. The battery power option and the relay option cannot be installed together. Software The software of the DOTX-45 is organized in an easy to follow menu-based system.
DOTX-45 Dissolved Oxygen System Part 6 – Configuration Any data that may be changed will be flashing. This flashing indicates user entry mode and is initiated by pressing the ENTER key. The UP arrow key will increase a flashing digit from 0 to 9. The LEFT arrow key moves the flashing digit from right to left. Once the change has been completed, pressing ENTER again stores the variable and stops the flashing. Pressing ESC aborts the change and also exits user entry mode.
DOTX-45 Dissolved Oxygen System MENU SECTIONS Part 6 – Configuration Start MEASURE CAL CONFIG CONTROL DIAG or or or *PID 0% #1 or Cal D.O. Entry Lock (display only) Temperature Set Hold *PID 100% #1 Sensor mV Cal Temp Set Delay Fault List *PID Setpoint #1 * PID Status Contrast Sim Out *PID Prop #1 Loop Current (#1) Inst. Type Loop Current (#2) * PID Timer *PID Int #1 Fail Out #1 Zero Filter *PID Deriv #1 Slope Fail Val #1 Atm.
DOTX-45 Dissolved Oxygen System 6.22 Part 6 – Configuration Measure Menu [MEASURE] The default menu for the system is the display-only menu MEASURE. This menu is a display-only measurement menu, and has no changeable list items. When left alone, the instrument will automatically return to this menu after approximately 30 minutes. While in the default menu, the UP arrow allows the user to scroll through the secondary variables on the lower line of the display.
DOTX-45 Dissolved Oxygen System Part 6 – Configuration % Saturation The most common display of D.O. in water is either PPM or mg/L units. However, the same PPM value at different water temperatures can represent quite different concentrations of oxygen in terms of the percent of saturation. This display simply indicates the % of oxygen saturation represented by the current PPM or mg/L display. v4.02 Transmitter software version number. 0.00 PPM D.O.
DOTX-45 Dissolved Oxygen System 6.24 Part 6 – Configuration Configuration Menu [CONFIG] The Configuration Menu contains all of the general user settings: Entry Lock This function allows the user to lock out unauthorized tampering with instrument settings. All settings may be viewed while the instrument is locked, but they cannot be modified. The Entry Lock feature is a toggle-type setting; that is, entering the correct code will lock the transmitter and entering the correct code again will unlock it.
DOTX-45 Dissolved Oxygen System Part 6 – Configuration close to the same. However, programming for type 3 percent saturation changes the measured parameter to read a dissolved oxygen value that represents the percent of oxygen saturation at a given temperature. When this unit of measurement is selected, the main analog output and all alarm and control functions will relate to this measurement.
DOTX-45 Dissolved Oxygen System Part 6 – Configuration Note: If the user will not be changing solution conductivity dramatically during the calibration process, leave a default setting of 00.50 mS/cm. For ultrapure water applications, set this value to 0.00. For sea water applications, set this value to 53.00.
DOTX-45 Dissolved Oxygen System Part 6 – Configuration AC OPERATED UNITS ONLY 6.25 *Relay B Mode Relay B can be used in a number of ways: as a setpoint control, as an alarm, or as the control logic for an automatic sensor cleaning system. The settings for Relay B Mode are CON or FAIL. CLn1 and CLn2 are not used with this instrument.. The first two modes function identically to the corresponding modes on Relay A. Temp Units This function sets the display units for temperature measurement.
DOTX-45 Dissolved Oxygen System Part 6 – Configuration though the controller can achieve 0% or 100% anywhere within the range.) If the 0% point is lower than the 100% point, then the controller action will be “reverse” acting. That is, the output of the controller will increase if the measured value is less than the setpoint, and the output will decrease if the measured value is larger than the setpoint. Flipping the stored values in these points will reverse the action of the controller to “direct” mode.
DOTX-45 Dissolved Oxygen System Part 6 – Configuration and therefore, it is best in most cases to leave it at the default value. Increasing this value will make the controller more responsive. AC POWERED UNITS ONLY *Set 4 mA #2 *Set 20 mA #2 [temp/D.O.] These functions set the second 4 mA and 20 mA current loop output points for the transmitter. The output may be set to track temperature (default), PPM oxygen, or % Saturation.
DOTX-45 Dissolved Oxygen System Part 6 – Configuration delay setting for the controller. The entry value is limited to a value between 0 and 999 seconds. Press ENTER to initiate user entry mode, and the value will flash. Use arrow keys to modify value; range is 0 to 999 seconds. Press ENTER to store the new value. *A Phasing This function establishes the direction of the relay trip. When phase is HI, the relay operates in a direct mode.
DOTX-45 Dissolved Oxygen System *Setpnt A-HI *Hyst A-HI *Delay A-HI *Setpnt A-LO *Hyst A-LO *Delay A-LO Part 6 – Configuration If Relay A Mode is set to Alarm Mode, AL, then the following settings will appear in the Config Menu list automatically. In this mode, two setpoints can be selected on the same relay, to create an alarm band. Phase HI selection causes the relay to energize outside of the band, and Phase LO causes the relay to energize inside of the band.
DOTX-45 Dissolved Oxygen System Part 6 – Configuration 6.26 Diagnostics Menu [DIAG] The diagnostics menu contains all of the user settings that are specific to the system diagnostic functions, as well as functions that aid in troubleshooting application problems. Set Hold The Set Hold function locks the current loop output values on the present process value. This function can be used prior to calibration, or when removing the sensor from the process, to hold the output in a known state.
DOTX-45 Dissolved Oxygen System Part 6 – Configuration which the diagnostic system re-detects them. The exception to this rule is the calibration failure. When a calibration fails, no corrupt data is stored. Therefore, the system continues to function normally on the data that was present before the calibration was attempted. After 30 minutes or if power to the transmitter is cycled, the failure for calibration will be cleared until calibration is attempted again.
DOTX-45 Dissolved Oxygen System Fail Out Part 6 – Configuration This function enables the user to define a specified value that the main current output will go to under fault conditions. When the Relay Option Board is installed, the display will read Fail Out #1. When enabled to ON, the output may be forced to the current value set in Fail Val (next item.) With the Fail Out setting of ON, and a Fail Val setting of 6.
DOTX-45 Dissolved Oxygen System Part 6 – Configuration When failsafe is selected to be ON, the normally-open contacts of the relay will be closed during normal operation. In an attempt to make this configuration less confusing, the LCD icon logic is reversed with this setting, and the icon is OFF under this normal condition. Therefore, when the trip condition occurs, the closed N.O. contacts will be opened (relay de-energized), and the LCD icon will illuminate.
Part 7 – Calibration 7.1 Oxygen Calibration Once power is applied, the sensor must be given time to stabilize. This is best done by following the zeroing procedure below. Establishing a stable zero is critical to the proper operation of the monitor. A complete calibration will include zeroing and spanning the sensor. It is generally unnecessary to set the zero at every calibration, however, it should be done during the initial installation. 7.11 Oxygen Span Cal The system provides three methods of D.O.
DOTX-45 Dissolved Oxygen System Part 7 –Calibration 4. Press the ENTER key. The screen will display a flashing 1-spl for 1-point, a %-sat for Saturation calibration, or a 3-zer for zero calibration. Using the UP arrow key, set for a 1-spl calibration and press ENTER. 5. The system now begins acquiring data for the calibration value. As data is gathered, the units for ppm and temperature may flash. Flashing units indicate that this parameter is unstable.
DOTX-45 Dissolved Oxygen System Part 7 –Calibration 2. Cover the sensor, if necessary, to shield it from the direct rays of the sun. Remember, the membrane must not be submerged - it must be in the air letting the sensor hang, membrane downward, while powered. 3. Allow the system to operate undisturbed for at least 20 minutes. If the system is stable, the value on the display will increase to some PPM value and remain at that level. At that point, calibration can continue. 4.
DOTX-45 Dissolved Oxygen System Part 7 –Calibration These steps below assume that the sensor has been prepared in accordance with section 5, Dissolved Oxygen Sensor Assembly, earlier in this manual. Note that the 10 hour waiting time in step 2 below is not required if the monitor has been running for 24 hours prior to zeroing. If the unit has been running with the sensor connected, the sensor will normally return to a stable zero within 15 minutes. 1. Remove the sensor from the application if necessary.
DOTX-45 Dissolved Oxygen System 7.2 Part 7 –Calibration Temperature Calibration The temperature calibration sequence is essentially a 1-point offset calibration that allows adjustments of approximately ±5 °C. The sensor temperature may be calibrated on line, or the sensor can be removed from the process and placed into a known solution temperature reference. In any case, it is critical that the sensor be allowed to reach temperature equilibrium with the solution in order to provide the highest accuracy.
Part 8 – PID Controller Details 8.1 PID Description PID control, like many other control schemes, is used in chemical control to improve the efficiency of chemical addition or control. By properly tuning the control loop that controls chemical addition, only the amount of chemical that is truly required is added to the system, saving money.
DOTX-45 Dissolved Oxygen System Part 8 –PID Controller 1 de(t ) output = P e(t ) + ∫ e(t )d (t ) + D I dt Where: output = P= I= D= t= e(t) = Figure 8-1 controller output proportional gain integral gain derivative gain time controller error (e=measured variable – setpoint) ISA (Ideal) PID Equation The most notable feature of the algorithm is the fact the proportional gain term affects all components directly (unlike some other algorithms - like the “series” form.
DOTX-45 Dissolved Oxygen System D Part 8 –PID Controller Derivative gain. The addition of derivative control can be problematic in many applications, because it greatly contributes to oscillatory behavior. In inherently slow chemical control process’, differential control is generally added in very small amounts to suppress erratic actions in the process that are non-continuous, such as pumps and valves clicking on and off.
DOTX-45 Dissolved Oxygen System 8.4 Part 8 –PID Controller Manual PID Override Control The DOTX-45 electronics is equipped designed to allow the user to take manual control of the PID output. This is often useful when starting up a control loop, or in the event that you wish to bump the system manually to measure system response time. To access the manual PID control, you must be in the MEASURE mode of operation and you must have the PID output displayed on the lower line. This line will indicate “XX.
DOTX-45 Dissolved Oxygen System Part 8 –PID Controller The easiest process’ to control with closed-loop schemes are generally linear, and symmetrical, in nature. For example, controlling level in tank where the opening of valve for a fixed period of time corresponds linearly to the amount that flows into a tank. Chemical control process’ can be more problematic when the nature of the setpoint value is non-linear relative to the input of chemical added. For example, D.O.
Part 9 – System Maintenance 9.1 General The DOTX-45 Dissolved Oxygen System will generally provide unattended operation over long periods of time. With proper care, the system should continue to provide measurements indefinitely. For reliable operation, maintenance on the system must be done on a regular schedule. Keep in mind that preventive maintenance on a regular schedule is much less troublesome than emergency maintenance that always seems to come at the wrong time. 9.
DOTX-45 Dissolved Oxygen System Part 10– Troubleshooting While the sensor is disassembled for membrane changing, examine the condition of the o-rings on both ends of the electrolyte canister. If the o-rings show any signs of damage, replace them with new ones from the spare parts kit. It is good practice to change these o-rings once a year, regardless of their condition. 9.31 Lead Anode Replacement Galvanic D.O. sensors consume the lead electrode during normal operation.
DOTX-45 Dissolved Oxygen System Part 10– Troubleshooting Part 10 – Troubleshooting 10.1 General The information included in this section is intended to be used in an attempt to quickly resolve an operational problem with the system. During any troubleshooting process, it will save the most time if the operator can first determine if the problem is related to the analyzer, sensor, or some external source.
DOTX-45 Dissolved Oxygen System Part 10– Troubleshooting 5. If rigid conduit has been run directly to the DOTX-45 enclosure, check for signs that moisture has followed conduit into the enclosure. 6. Check for ground loops. Although the membrane sensor is electrically isolated from the process water, high frequency sources of electrical noise may still cause erratic behavior in extreme conditions.
DOTX-45 Dissolved Oxygen System Part 10– Troubleshooting 2. If analyzer does not appear to power up (no display), remove power and check removable fuse for continuity with a DVM. 3. Using a DVM, check the voltage across the BLUE and WHITE wires coming from the power supply board in the base of the enclosure. FIRST, disconnect any wiring going to Iout#1. Then, verify voltage across these wires is about 16-18 VDC when still connected to the terminal strip on the front half of the enclosure.
DOTX-45 Dissolved Oxygen System MESSAGE Part 10– Troubleshooting DESCRIPTION POSSIBLE CORRECTION Max is 200 Entry failed, maximum user value allowed is 200. Reduce value to ≤ 200 Min is 200 Entry failed, minimum value allowed is 200. Increase value to ≥ 200 Cal Unstable Calibration problem, data too unstable to Clean sensor, get fresh cal solutions, allow calibrate. Icons will not stop flashing if data is too temperature and conductivity readings to fully unstable.
DOTX-45 Dissolved Oxygen System MESSAGE Part 10– Troubleshooting DESCRIPTION POSSIBLE CORRECTION D.O. Cal Fail Failure of oxygen calibration. FAIL icon will not extinguish until successful calibration has been performed, or 30 minutes passes with no keys being pressed. Clean sensor redo zero and span calibration. If still failure, sensor slope may be less than 20% or greater than 500%. Perform sensor tests as described in section 10.4. Replace sensor if still failure.
DOTX-45 Dissolved Oxygen System Part 10– Troubleshooting the nominal output of the sensor will be about +400mVDC when measured in air at 25C (100% saturation) from BLACK (-) to RED (+) on the analyzer terminal strips. This value is affected by temperature, pressure, and age of the sensor so it’s possible to see a typical value that ranges from perhaps +200mVDC to about +800 mVDC under a wide range of conditions in air. A. Disconnect the five sensor wires from the oxygen monitor.
DOTX-45 Dissolved Oxygen System Part 10– Troubleshooting If you suspect that water has gotten into a cable connection or into the plug connection of a submersible sensor, disconnect the cable and allow the parts of the sensor to sit in a warm place for 24 hours. If water in the connector is the problem, it should dry out sufficiently to allow normal sensor operation. Barometric Pressure Conversion Inches of Millimeters of Mercury(inHg) Mercury (mmHg) Feet Above Sea Level 22.00 558.8 +8790 22.
DOTX-45 Dissolved Oxygen System Part 10– Troubleshooting Water Saturated Concentration of O2 Temperature Temperature PPM °F °C 32 0.0 34 PPM °F °C 14.6 74 23.3 8.5 1.1 14.1 76 24.4 8.3 36 2.2 13.7 78 25.6 8.2 38 3.3 13.3 80 26.7 8.0 40 4.4 12.9 82 27.8 7.8 42 5.6 12.6 84 28.9 7.7 44 6.7 12.2 86 30.0 7.5 46 7.8 11.9 88 31.1 7.4 48 8.9 11.6 90 32.2 7.3 50 10.0 11.3 92 33.3 7.1 52 11.1 11.0 94 34.4 7.0 54 12.2 10.7 96 35.6 6.
Spare Parts DOTX-45 DOTX-45-115VAC-R2 Transmitter, Loop-powered Monitor, 115 VAC, Dual Relays/Outputs DOE-45PA DOE-45PA -SM DOE-45PA -SE DOE-45PA -SH Submersible D.O. Sensor with 30’ cable Submersible D.O. sensing module Submersible D.O. sensing element body Submersible D.O. Sensing Holder Assembly with 30’ cable DOE-45PA -EC DOE-45PA -MH DOE-45PA -RLE DOE-45PA -RM* Electrolyte chamber Membrane holder, type 316 stainless steel Replacement lead electrode Membranes, 5 mil., pkg.
DOTX-45 Dissolved Oxygen System DOTX-45 Part 10– Troubleshooting 67 -
DOTX-45 Dissolved Oxygen System Part 10– Troubleshooting M-3693/0409 DOTX-45 68 -
