TROUBLESHOOTING
1. If the voltage at the sensor input is less than 7V DC in a no ow situation, disconnect the sensor from the barrier strip and
measure the voltage again at the sensor input terminals of the barrier strip. It should be between 8…20V DC. If the voltage
at the sensor input is still below 7V DC or 3V DC, the problem may be with the monitor (hardware or programming).
2. If you suspect that the sensor is bad, you can test the monitor circuitry by connecting a piece of wire to one of the sensor
input terminals, and tap the other side of the wire to the other sensor input terminal. Shorting across the sensor input
terminals ON and OFF repeatedly allows the display to respond by trying to calculate a ow rate for the frequency of your
shorting action. If the display does not show a change from 0.00, it indicates a problem with the monitor.
3. If the monitor tests OK and there are any splices in the cable, break the sensor cable at the splice closest to the sensor and
retry the shorting test in Step 2.
4. If the cable tests OK, drain the pipe line, verify the pressure is o, and remove the top lock nuts holding the sensor
electronics. Spin the impeller by hand. If ows are noted on the display, and the impeller spins freely, then the ow rates
may have been below the design minimums, or the line was full of air. Try again. If the sensor fails to respond then replace
the sensor.
Troubleshooting
Page 17 February 2018 SEN-UM-01635-EN-11
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