Chapter 5 Sensor Diagnostics; Sensor Diagnostics - Hydronix Hydro-Probe Configuration And Calibration Manual

Chapter 5
The following tables list the most common faults found when using the sensor. If you are unable to
diagnose the problem from this information, please contact Hydronix technical support.

1 Sensor Diagnostics

Symptom: No output from Sensor
1.1
Possible
explanation
Output is working
but not correctly
No power to sensor
Sensor has
temporarily locked
up
No sensor output at
control system
No sensor output at
junction box
Sensor MIL-Spec
connector pins are
damaged
Internal failure or
incorrect
configuration
Check Required result
Perform simple test Milliamp reading
with hand on sensor within the normal
range (0-20mA, 4-
20mA)
DC power at +15Vdc to +30Vdc
junction box
Power down and re- Sensor functions
power sensor correctly
Measure sensor Milliamp reading
output current at within the normal
control system range (0-20mA, 4-
20mA). Varies with
moisture content
Measure sensor Milliamp reading
output current at within the normal
terminals in junction range (0-20mA, 4-
box 20mA). Varies with
moisture content
Disconnect the Pins are bent and
sensor cable and can be bent to
check if any pins normal to make
are damaged electrical contact
Connect the sensor Digital RS485
to a PC using the connection is
Hydro-Com working. Correct the
software and a configuration
suitable RS485
converter
Sensor Diagnostics
Action required on
failure
Power down and re-
power sensor
Locate fault in
power supply/wiring
Check power
Check cabling back
to junction box
Check sensor
connector pins
Check sensor
configuration by
connecting to a PC
Digital RS485
connection is not
working. Sensor
should be returned
to Hydronix for
repair.
Configuration and Calibration Guide HD0679 Rev 1.2.0 43