TROUBLESHOOTING
1 . If the voltage at the sensor input is less than 7V DC in a no flow 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 flow 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 off, and remove the top lock nuts holding the sensor
electronics . Spin the impeller by hand . If flows are noted on the display, and the impeller spins freely, then the flow 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