Omega | Part 3 |
3.2Troubleshooting
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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