User's Manual

7 Maintaining the product
32
Do not remove the auxiliary circuit board for the NO
sensor until immediately before installation. Do not
leave the sensor without auxiliary circuit board for
longer than 15 minutes.
3. Install new sensor/new bridge in the slot:
• Slot 1: O
2
sensor
• Slot 2: CO sensor or CO
low
sensor
• Slot 3: NO sensor or NO
low
sensor
4. Push the hose connections onto the sensor/bridge.
5. Close the measuring instrument.
When retrofitting a sensor, the associated measurement
parameter/unit must be enabled in the reading display.
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7.7. Cleaning the modular flue gas probe
✓ Disconnect the flue gas probe from the measuring instrument
prior to cleaning.
1. Release the probe catch by pressing the key on the probe
handle and remove the probe module.
2. Blow compressed air through the flue gas ducts in probe
module and probe handle (see illustration). Do not use a brush!
3. Fit a new probe module on the probe handle and engage it in
place.
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7.8. Replacing the probe module
✓ Disconnect the flue gas probe from the measuring instrument.