Changing The Sensor; Maintenance - Quest Technologies SafeLog 100 Operator's Manual

7. CHANGING THE SENSOR

Note: While the case is open the unit is not intrinsically safe; perform this
exercise in a non-hazardous area. Allow the new sensor to stabilize.
Zero and calibrate prior to use.
The entire sensor module is replaced. The old sensor module should be
discarded; do not attempt to break the module apart or reuse any parts.
To change the sensor, first remove the battery and its holder. Inside of the
battery compartment is a single screw. Turning the screw counter-clock
wise pushes up and releases the red top cap of the unit. Lift the sensor
module up off of the circuit board and push in the new one. A circular
hydrophobic filter sits in the opening on top of the sensor module; make
sure the new sensor has a filter in place prior to reinstalling the top cap. Set
the top cap back on the unit and turn the screw clockwise until the top cap
again seals against the unit's main housing. When the battery is replaced the
unit will turn on and read the new sensor information.

8. MAINTENANCE

When the unit is stored or not in use for extended lengths of time, it should be
calibrated, functionally tested, and its battery should be checked or changed at
least once per month. This will help to ensure that the unit will be working
properly when it is needed.
Note: If the unit has been stored without a battery, then it requires a
stabilization period, prior to calibration, once the battery has been
replaced.