User's Guide

POLI User’s Guide
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8. Maintenance
The POLI requires little maintenance, aside from replacing sensors, filters, batteries and
pumps if the instrument is equipped.
8.1 Replacing Filters
Pump Version
If the external filter is dirty or clogged, remove it by unscrewing it from the inlet. Discard
it and replace it with a new water-trap filter.
IMPORTANT! A pumped POLI must not be calibrated or operated without a filter.
Operation without a filter may damage the instrument.
8.2 Removing/Cleaning/Replacing Sensor Modules
WARNING! Do not replace sensors in hazardous locations.
All sensors are located inside the sensor compartment in the upper half portion of the
POLI PCB assembly. They are accessed by removing the six screws in the back of the
POLI and then turning the instrument over and lifting off the sensor cover.
1. Turn off the instrument.
2. Loose and remove the six screws in the back of the instrument.
3. Turn the instrument over, lift off the front cover from the back of the instrument.
4. Carefully lift out each sensor you wish to inspect or replace.
5. Install the replacement sensor. Make sure the electrical contact pins are aligned
with the holes in the PC board and that the sensor is seated firmly.
6. Replace the cover and tighten the 6 screws.