Xylem H-310 - Manual (Page 22)

4-4 Maintenance
H-310
4.4 Maintaining Desiccant Packs
The desiccant inside the dry air system should be checked every 3 to 6 months. The desiccant
bags have a transparent strip which allows the condition of the desiccant to be visually checked.
Dry desiccant is dark blue and saturated desiccant will have turned pink. The desiccant packs
can be reused by drying them in an oven at 125 F to 150 F for 4 to 8 hours or until the desiccant
returns to a dark blue color.
4.5 Trouble Shooting
Our experience over the last 5 years with submersible sensors has taught us a lot about the
problems associated with field deployable equipment. While there are few things that can go
wrong with a H-310 sensor, here is a list of the most common problems.
No SDI-12 response
1- Check power and ground connections. Our experience shows that good power and
ground connections are the most important and the most overlooked.
2- Check pin out of Data Recorder for correct wiring.
H-310 Wiring Code
Red +12V
White Data
Black Ground
Shield Ground (must be connected)
Intermittent Data
1- Check your power and ground connections. Moisture over time will oxidize and
corrode connectors and pins.
2- Check the H-305 Desiccant packs. The intermittent data coming from the moisture is
beginning to accumulate at the sensor. If this is the case, you should contact Design
Analysis for instructions as how to proceed.