Xylem XL Series H-522 - Plus - Manual (Page 269)

Chapter 24
Maintenance/Trouble Shooting
XL™ Series
Maintenance/Trouble Shooting 24-1
24.1 Maintenance
Sustained operation of the XL™ is almost maintenance-free. There are no desiccant or
serviceable parts to maintain. As with any precision instrument, the calibration should be
checked or verified on a regular basis. Slight modifications to the Stage slope and offset
variables can help with the accuracy of the XL™ in the field. This can be accomplished by
taking two measurements at each end of the pressure range and doing a two point calculation to
generate a slope and offset. The accuracy achieved by this method is a function of how accurate
the measurements are recorded, etc. A field-calibrated instrument may not meet the
manufacturer's specification for accuracy.
24.2 Trouble Shooting
It is unlikely that this manual will ever contain trouble shooting tips to cover every problem that
will be encountered. Feedback from customers is very valuable and greatly aids in the quest for
constant product enhancement. Please feel free to call the factory for technical assistance and
also with solutions you have found to past problems.
Our experience with pressure transducers has taught us a lot about the problems associated with
field installed equipment. The following list of problems and possible solutions will
undoubtedly grow with subsequent revisions of this manual and may be helpful to you.
No SDI-12 Response:
1-
Verify power to the XL™.
2- Check all SDI-12 connections, including DATA and GND.
3- Check the pin out of your Data Recorder for correct wiring.
4- Make sure all sensors have a unique address.
Intermittent Data:
1-
Check your power and ground connections. Moisture over time will oxidize and corrode
connectors and pins.
2- Verify your power supply or battery voltage. As the power supply approaches the lower
threshold of the XL™ supply range, it may begin to miss readings intermittently.
3- Read the status messages, Min, and Max values, and system resets of the XL™ for a
possible malfunction or clue to the problem.