Emerson Model 404 ENDURANCE™ Conductivity Sensor Instruction Manual
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Instruction Sheet PN 51A-404/rev.M December 2010 Model 404 ENDURANCE™ Conductivity Sensor For additional information, please visit our website at www.emersonprocess.com/raihome/liquid/. CAUTION WARNING SENSOR/PROCESS APPLICATION COMPATIBILITY The wetted sensor materials may not be compatible with process composition and operating conditions. Application compatibility is entirely the responsibility of the user. Before removing the sensor, be absolutely certain that the process pressure is reduced to 0 psig and the process temperature is lowered to a safe level! SENSOR SPECIFICATIONS SPECIFICATIONS MODEL 404-16 (PVC body) MODEL 404-17 (stainless steel body) Wetted Materials Titanium, PEEK (glass filled), PVC, EPDM, polyethylene Titanium, PEEK (glass filled), 303 SST, EPDM Temperature Range 32-140°F (0-60°C) 32-212°F (0-100°C) Maximum Pressure 20 psig (239 kPa abs) at 60°C (140°F) 100 psig (791 kPa abs) at 25°C (77°F) (use FNPT fittings only) 100 psig (791 kPa abs) INSTALLATION If the sensor is installed in a sidestream with the sample draining to open atmosphere, bubbles may accumulate on the electrodes. Trapped bubbles will cause errors. Normally, as bubbles accumulate the conductivity reading drifts down. To control bubble formation, apply a small amount of back pressure to the sensor. FIGURE 1. Installation of Model 404 Sensor MODEL 404 WIRING WIRING WIRE COLOR AND CONNECTIONS IN SENSOR COLOR FUNCTION Gray Connects to outer electrode Clear Coaxial shield for gray wire Orange Connects to inner electrode Clear Coaxial shield for orange wire Red White with red stripe RTD in RTD sense RTD return RTD White Clear Shield for all RTD lead wires WIRING DIAGRAMS FIGURE 2. Model 54eC Wiring TB2 RTN SENSE RTD IN SHLD TB1 WHITE RCV B WHITE/RED RCV A RED CLEAR RSHLD CLEAR GRAY DRVB ORANGE CLEAR FIGURE 4. Model 1066 Wiring 2 FIGURE 3. Model 56 and 1056 Wiring DRVA DSHLD MODEL 404 INSTALLATION FIGURE 5. Model Xmt-C-10 Wiring (Panel) FIGURE 6. Model Xmt-C-11 Wiring (Pipe or Wall) FIGURE 7. Model 5081-C Wiring FIGURE 8. Model 6081-C Wiring WIRING THROUGH A JUNCTION BOX If wiring connections are made through a remote junction box (PN 23550-00), wire point-to-point. Use cable 23747-00 (factory-terminated) or 9200275 (no terminations). 3 MODEL 404 WIRING CLEANING THE SENSOR The 404-17 (stainless steel body) sensor can be taken apart for cleaning. However, in some cases, disassembling and reassembling the sensor can cause the cell constant to change as much as 1%. For maximum accuracy, the cell constant should be rechecked after the sensor has been reassembled. The 400-16 (PVC body) sensor cannot be taken apart. Use a warm detergent solution and a soft brush or pipe cleaner to remove oil and scale. Isopropyl alcohol (rubbing alcohol) can also be used to remove oily films. Avoid using strong mineral acids to clean conductivity sensors. CALIBRATION ENDURANCE conductivity sensors are calibrated at the factory and do not need calibration when first placed in service. Simply enter the cell constant printed on the label into the analyzer. After a period of service, the sensor may require calibration. Because Model 404 sensors have a flow-through design, they are best calibrated against a referee meter and sensor where the two sensors are connected in series with the same liquid flowing through both. For more information about calibrating contacting conductivity sensors, refer to application sheet ADS 43-024, available on the Rosemount Analytical website. 4 MODEL 404 WIRING TROUBLESHOOTING PROBLEM PROBABLE CAUSE SOLUTION Off-scale reading Wiring is wrong. Verify wiring. Temperature element is open or shorted. Check temperature element for open or short circuits. See Figure 9. Sensor is not in process stream. Be sure sensor is completely submerged in process stream. Variopol cable is not properly seated. Loosen connector and reseat. Sensor has failed. Perform isolation checks. See Figure 10. Sensor is improperly installed in process stream. Be sure sensor is completely submerged in process stream. Variopol cable is not properly seated. Loosen connector and reseat. Bubbles trapped in sensor. Be sure sensor is properly oriented in pipe or flow cell. See Figure 1. Apply back pressure to flow cell. Wrong temperature correction algorithm. Check that temperature correction is appropriate for the sample. See analyzer manual for more information. Wrong cell constant. Verify that the correct cell constant has been entered in the analyzer and that the cell constant is appropriate for the conductivity of the sample. See analyzer manual. Electrodes are fouled. Clean electrodes. Sensor is sampling a dead area. Move sample line to a location more representative of the process liquid. Noisy reading Reading seems wrong (lower or higher than expected) Sluggish response FIGURE 9. Checking Temperature Element Disconnect leads and measure resistance shown. The measured resistance should be close to the value in the table. FIGURE 10. Checking Continuity and Leakage Disconnect electrode leads and measure resistance and continuity as shown. Sensor must be dry when checking resistance between electrode leads. 5 NOTES 6 NOTES 7 The right people, the right answers, right now. ON-LINE ORDERING NOW AVAILABLE ON OUR WEB SITE http://www.raihome.com Specifications subject to change without notice. 8 Credit Cards for U.S. Purchases Only. Emerson Process Management 2400 Barranca Parkway Irvine, CA 92606 USA Tel: (949) 757-8500 Fax: (949) 474-7250 http://www.raihome.com © Rosemount Analytical Inc. 2010