Omega Engineering Stud Sensor CDE 45P User Manual

 
Table of Contents  
PART 1 - INTRODUCTION ............................................................................................................................... 3  
1.1  
1.2  
1.3  
General................................................................................................................................................... 3  
Sensor Features....................................................................................................................................... 3  
Sensor Specifications (CDE-45P)............................................................................................................ 4  
Figure 1-1 CDE-45P Sensor Dimensions (standard, convertible style)............................................................ 4  
PART 2 – INSTALLATION................................................................................................................................ 5  
2.1  
General................................................................................................................................................... 5  
Figure 2-1 CDE-45P Sensor Types.................................................................................................................. 6  
2.2  
Electrical ................................................................................................................................................ 7  
Figure 2-2 Cable Description, Model CDE-45P............................................................................................ 7  
Figure 2-3 Wiring Diagram, CDE-45P Sensor and CDTX-45 Monitor/Analyzer ........................................... 8  
PART 3 – SENSOR MOUNTING ....................................................................................................................... 9  
3.1  
3.2  
Cleaning the Sensor ................................................................................................................................ 9  
Troubleshooting.................................................................................................................................... 10  
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Omega CDE-45P Conductivity Sensor  
Part 1– Introduction  
Part 1 - Introduction  
1.1  
1.2  
General  
The Model CDE-45P Conductivity Sensor measures the  
conductivity of aqueous solutions in industrial and municipal  
process applications. It is designed to perform in the  
harshest of environments. All seals are dual o-ring using  
multiple sealing materials. The sensor is designed for use  
with the Omega CDTX-45 Monitor/Analyzer.  
Sensor Features  
4-Electrode measurement system. Two of the  
electrodes are used to establish the sensor drive  
potential, while the other two sense the flow of current  
between the drive electrodes and maintain proper  
drive potential. In conventional 2-electrode sensors,  
as the process solution coats the electrode surfaces,  
the sensor output signal begins to decrease,  
producing an artificially low conductivity  
measurement. The Omega 4-Electrode system thus  
offers a high degree of accuracy for a longer period of  
time. The four electrodes are made of titanium for  
greater chemical resistance.  
The Omega 4-Electrode system compensates for the  
Effects of electrode fouling. As the electrodes  
become coated by the process solution, a feedback  
Mechanism detects the decrease in drive potential  
and automatically re-establishes the proper levels.  
When coating is such that compensation is no longer  
possible, and alarm signals the user that the sensor  
requires cleaning. The system also alerts the user in  
the event of integral temperature element failure.  
The Omega 4-Electrode system allows a single  
Sensor configuration to be used reliably over a wide  
Conductivity range. There is no need for multiple  
sensors with varying cell constants that are restricted  
to narrow operating ranges.  
Pt1000 RTD. The temperature element used in this  
Sensor is highly accurate and provides a highly linear  
output.  
O&M Manual  
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Omega CDE-45P Conductivity Sensor  
Part 1– Introduction  
1.3  
Sensor Specifications (CDE-45P)  
Measuring Range  
Wetted Materials  
0.000 to 2.000 S/cm  
Titanium, PEEK, FKM, EPR  
(316SS when sensor is submersion mounted)  
Temperature Compensation  
Sensor Cable  
Pt1000 RTD  
6 Conductor plus 2 shields,  
Temperature Pressure Range  
The choice of sensor material/ mounting option and the  
hardware used to mount the sensor will determine the  
temperature and pressure ratings. Please consult the  
factory for relevant temperature and pressure rating  
information.  
Maximum Flow Rate  
10 feet (3 meters) per second  
Max. Sensor-Analyzer  
Distance  
60 feet (18.2 meters)  
1 lb. (0.45 kg)  
Weight  
Inches (mm)  
Figure 1-1 CDE-45P Sensor Dimensions (standard, convertible style)  
O&M Manual  
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OMEGA CDE-45P Conductivity Sensor  
Part 2– Installation  
Part 2 – Installation  
2.1  
General  
The CDE-45P Conductivity Sensor is designed for  
industrial and municipal process applications.  
Mounting options include flow-through, submersion,  
insertion (special hardware required), or integral  
mount to the CDTX-45 Conductivity Monitor/Analyzer.  
The sensor-to-analyzer distance must not exceed 60  
feet (18.2 meters).  
Calibrate the sensor before placing it into the process.  
See Model CDTX-45 Monitor/Analyzer Instruction  
Manual for detailed calibration instructions.  
The sensor comes with a removable guard that  
surrounds the electrode face. This guard minimizes  
interference effects in tight locations where the sensor  
face is close to surrounding objects. If it is removed,  
take care to leave at least 1 in3 of space in front of the  
electrodes. If the guard is to be used, the sensor  
must be calibrated with it in place, since the guard  
affects the sensor cell constant.  
O&M Manual  
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OMEGA CDE-45P Conductivity Sensor  
Part 2– Installation  
SENSOR SIZE  
A
B
2.75  
(70.0)  
3.50  
1.98  
(50.4)  
2.50  
1-1/2”  
2”  
(88.9)  
(63.5)  
Figure 2-1 CDE-45P Sensor Types  
O&M Manual  
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OMEGA CDE-45P Conductivity Sensor  
Part 2– Installation  
2.2  
Electrical  
The Model CDE-45P sensor comes standard with 15 feet of 6  
conductor double shielded cable. The cable is permanently  
attached to the sensor, and a PEEK cordgrip is used to seal around  
the cable. Nevertheless, the cable should always be kept as clean  
and dry as possible.  
DANGER: DO NOT connect sensor cable to power lines.  
Serious injury may result.  
Take care to route sensor cable away from AC power lines,  
adjustable frequency drives, motors, or other noisy electrical signal  
lines. Do not run signal lines in the same conduit as AC power  
lines. Run signal cable in dedicated metal conduit if possible. For  
optimum electrical noise protection, run an earth ground wire to the  
ground terminal in the transmitter  
Refer to Figure 2-2, Cable Description and Figure 2-3, Wiring  
Diagram for illustrative details on electrical installation.  
Figure 2-2 Cable Description, Model CDE-45P  
Only 6-wire shielded interconnect cable must be used when  
connecting the Model CDE-45P sensor to the analyzer. This high-  
performance, double shielded, polyethylene jacketed cable is  
specially designed to provide the proper signal shielding for the  
sensor used in this system. No substitutions can be made.  
Substituted cables may cause problems with system performance  
O&M Manual  
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OMEGA CDE-45P Conductivity Sensor  
Part 2– Installation  
Figure 2-3 Wiring Diagram, CDE-45P Sensor and CDTX-45 Monitor/Analyzer  
Notes:1. Voltage between Terminals 11 and 12 MUST be between 16 and 35 VDC.  
2. Earth ground into Terminal 14 is STRONGLY recommended. This connection  
can greatly improve stability in electrically noisy environments.  
O&M Manual  
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Omega CDE-45P Conductivity Sensor  
Part 3 –Maintenance & Troubleshooting  
Part 3 – Sensor Mounting  
3.1  
Cleaning the Sensor  
Keep the sensor as clean as possible for optimum measurement  
accuracy. Frequency of cleaning depends upon the process  
solution.  
Note: Mechanical cleaning of the electrode surfaces may harm  
measurement quality if not performed with care. Do NOT use  
wire brushes, sandpaper and the like to clean any  
conductivity electrode.  
Wipe the measuring end of the sensor with a clean with a clean soft  
cloth. Then rinse with clean water (distilled or de-ionized if  
possible). This should remove most contaminate buildup.  
If necessary, soak the sensor for several minutes in a mild soap  
solution. Use a small, extra-soft bristle brush (such as a mushroom  
brush) to thoroughly clean the electrode surfaces. If surface  
deposits are not completely removed after performing this step, a  
dilute acid may be used to dissolve the deposits. Soak for a few  
minutes, and then rinse the sensor thoroughly with clean water  
(distilled or de-ionized if possible).  
Note: DO NOT soak the sensor in dilute acid solution for more  
than 5 minutes.  
WARNING: ACIDS ARE HAZARDOUS. Always wear eye and  
skin protection when handling. Follow all Material Safety Data  
Sheet recommendations. A hazardous chemical reaction can be  
created when certain acids come in contact with process  
chemicals. Make this determination before cleaning with any acid,  
regardless of concentration. DO NOT use Hydrochloric Acid on  
any stainless steel portion of the sensor.  
After cleaning the sensor, check measurement and re-calibrate the  
sensor.  
O&M Manual  
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Omega CDE-45P Conductivity Sensor  
3.2 Troubleshooting  
Part 3 –Maintenance & Troubleshooting  
The first step in resolving any measurement problem is to  
determine whether the trouble lies in the sensor or the  
transmitter. Since measurement problems can often be  
traced to surface deposits coating the electrodes, cleaning  
the sensor using the method outlined in Section 3.1 should  
always be the first step in any troubleshooting.  
If the sensor cannot be calibrated after cleaning, perform the  
following test. A multimeter will be needed.  
1.  
Disconnect the sensor from the transmitter or junction  
box.  
2.  
Using a multimeter, verify continuity between  
electrodes indicated below and the corresponding  
wire colors in the cable (red, blue, green and white,  
only).  
3.  
Verify that the sensor’s temperature element (Pt1000  
RTD) is functioning properly by measuring the  
resistance between the sensor’s yellow and black  
wires. The nominal resistance value at 25 ºC is 1097  
ohms. Use the following table as a guide to the  
approximate resistance value:  
O&M Manual  
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Omega CDE-45P Conductivity Sensor  
Part 3 –Maintenance & Troubleshooting  
ºC  
20  
25  
30  
35  
RTD Ω  
1078  
1097  
1117  
1136  
O&M Manual  
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M3696/0409  
 

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