27
Maintenance, Cleaning, Service
Lap PC
Please refer to your user manual for specific instructions on the care of your Lap PC.
Probe
The probe requires very little maintenance: battery changes, periodic calibration, CO
sensor replacement (typically every 24-36 months), dusting.
See “Powering” on page 2 for details on battery changes.
The %RH, CO and CO
2
sensors may be calibrated in the field following the
instructions in “Probe Calibration” on page 20. The temperature sensor is calibrated
at the factory. It is recommended that you return your probe to GrayWolf for an
annual factory recalibration and check-up.
The CO sensor has an expected operating life of approximately two years.
WolfSense IAQ LAP checks the output of the sensor during calibration and, as the
CO sensor nears the end of its operating life, warns you that the sensor needs to be
replaced. You may order a SEN-CO1 replacement sensor from GrayWolf or return
the probe to GrayWolf to have the sensor changed.
To change the CO sensor yourself:
1. Unscrew the probe handle from the probe body. (See Figure 3 on page 2.)
2. Carefully remove the black cap from the top of the probe. This is a press fit and the cap can
normally be removed by hand.
3. Cut the tie that is holding the CO
2
and CO sensors.
4. Unplug the CO
2
cell.
5. Unplug the CO cell.
6. Plug in the new CO cell.
7. Plug in the CO
2
cell.
8. Fix cells in place with a new tie.
9. To reassemble the probe, use the reverse procedure.
Before using the probe with the new sensor, calibrate the CO sensor using the
procedure described in “Probe Calibration” on page 20.
When not using the probe for a period of time, store it in a cool, dry, dust-free
environment. The recommended storage temperature is 32ºF to 70ºF (0ºC to 21ºC).
If the storage period will be more than four weeks, remove the batteries from the
probe before storing.
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