TESTO 350 - Cleaning the Modular Flue Gas Probe; Replacing Probe Pre-Filter; Changing the Thermocouple

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7.6. 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.
7.7. Replacing probe pre-filter
On probe modules with pre-filter the pre-filter can be replaced.
> Unscrew the pre-filter from the probe shaft and screw on a new
filter.
7.8. Changing the thermocouple
1. Release the probe catch by pressing the key on the probe
handle and remove the probe module.
2. Remove the thermocouple plug-in head from the socket using a
screwdriver and pull the thermocouple out of the probe shaft.
3. Keep inserting the new thermocouple into the probe shaft until
the connection head clicks into place.
4. Fit a new probe module on the handle and engage in place.
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