ADS Environmental Services IETG FlowHawk QR 775012 A4 - Manual (Page 345)

Maintenance and Troubleshooting 8-61
Problem Individual PDEPTH_1 values consistently read 0 under
wet pipe conditions.
Possible
Causes
Sensor may be faulty.
5-volt fuse on regulator may have blown.
Possible
Solutions
Replace the Peak Combo Sensor.
Replace the 5-volt blue fuse (when replaceable) on the
regulator or return the monitor to IETG for regulator
replacement.
Caution: Do not connect a questionable sensor to
another monitor before verifying the integrity of the
sensor. A shorted sensor will blow the 5-volt (blue)
replacement fuse on the regulator in the monitor.
Temperature Subsystem
The following table contains general troubleshooting techniques for
the temperature subsystem corresponding to all sensors supporting
the FlowHawk.
Problem Temperature readings are excessively low or incorrect.
Possible
Causes
Temperature sensor may be faulty.
Cable connecting sensor to monitor may be loose or
broken.
Processor board may be faulty.
Possible
Solutions
Examine the sensor connection to the monitor, and
verify that it is properly connected and secure.
Replace the sensor.
Replace the monitor if defective.