Xylem H-3531 FlashLite - Manual (Page 23)

Chapter 3
Maintenance/Troubleshooting
H-3531
Maintenance 3-1
3.1 Maintenance
Sustained operation of the H-3531 FlashLite™ pressure sensor is almost maintenance free. As
with any precision instrument, the calibration should be checked on a regular basis. The
instrument has no filters or user serviceable internal parts.
3.2 Precautions
!
Check for leaks, make certain the connections to the pressure port are tight.
! Make certain the atmospheric vent is not covered or blocked.
! Make certain the gauge station enclosure is open to the atmosphere. If the sensor is placed
in a cabinet or sealed enclosure, the cabinet must have a screened vent or other opening to
the atmosphere.
3.3 Troubleshooting
Experience over the years with pressure sensors has identified several common problems:
No SDI-12 response or intermittent data
1. Check all wiring including power and ground connections. Battery connections can
become corroded. Check for corrosion in the connectors and terminal strips.
2. The H-3531 FlashLite™ measures and reports it’s internal power supply voltage
along with Stage, Pressure and Temperature. Make a measurement and check to
see if the voltage is between 10.0 and 16.0 Volts.
3. Check the connections between your data recorder and the H-3531 FlashLite™
sensor. The power connections are made on the 7-pin circular connector.
4. Verify that there is not another SDI-12 sensor on the SDI-12 bus with the same
SDI-12 address as the H-3531 FlashLite™. Try communicating with the H-3531
FlashLite™ without any other SDI-12 devices on the bus. Sending a “*!” or “?!”
should cause the H-3531 FlashLite™ to return its own address as long as there are
no other SDI-12 devices on the SDI-12 bus.
Please feel free to call the factory for technical assistance and also with solutions you have found
to past problems.