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Maintenance BDS 3960
Teledyne Analytical Instruments 58
Maintenance
5.1 Routine Maintenance
Aside from normal cleaning and checking for leaks at the gas
connections, routine maintenance is limited to refilling sensor with
deionized water, replace burned fuses, replace backup batteries for PPC,
and recalibration. For recalibration, see Section 4.4 Calibration.
WARNING: SEE WARNINGS ON THE TITLE PAGE OF THIS
MANUAL.
5.2 Adding Water to the BDS Sensor
When running dry gas through the sensor, water is extracted from
the electrolyte. Therefore, the electrolyte level should be checked
periodically. When the electrolyte level is low, only de-ionized water or
distilled water should be added into the sensor. It typically takes about
four months to dry the electrolyte from the MAX line to the MIN line
when the sensor is operated on a bone dry gas line.
It is not necessary to turn off the power to the analyzer while
adding water, but care should be taken that no water is splashed outside
the sensor. Spilling water on the PC board could cause serious damage
to the analyzer and electric shock to the personal.
Unscrew and take the sensor cap off. Use the wash bottle provided
to squeeze de-ionized water into the sensor, as shown in Figure 5.1. It is
a good practice that water is added before reaching the MIN line.
Reinstall the cap after adding water.