TESTO 350 - Replacing the Filter for no Sensors; Recalibrating Sensors

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10.Attach the sensor compartment cover and close it (the clip must
click into place).
After replacing an O
2
-sensor, plug in and change for 60
min. before you use the device.
7.4. Replacing the filter for NO sensors
✓ The measuring instrument must be switched off and isolated
from the power supply.
1. Place the measuring instrument on its front.
2. Open the cover of the sensor compartment (locking clip) and
take it off.
3. Loosen the bow from the sensor and take it out of the bracket,
see Changing / retrofitting sensors, page 80.
4. Pull the hose connectors off the sensor.
5. Remove the sensor from the slot.
6. Remove the used filter from the sensor.
7. Plug the new filter on the sensor.
Avoid touching the sensor. Follow the marking on filter and
sensor.
8. Insert the sensor in the slot.
9. Press the hose connectors on the sensor.
10.Insert the bow into the bracket, see Changing / retrofitting
sensors, page 80.
11. Attach the service cover and close it (the clip must click into
place).
12. Reset the ppm-hour meter, see ppmh counter, page 64.
7.5. Recalibrating sensors
See Calibration data, page 65.
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