Change Co, Co H2 And No Sensor; Clean Modular Flue Gas Probe - TESTO 300 LL NEXT LEVEL Instruction Manual

10 Maintenance

10.7.2 Change CO, CO H2 and NO sensor

Measuring instrument is open, see Section Open measuring

instrument.
1
Remove faulty sensor and hose
connections from the slot.
2
Remove hose connections from the
faulty sensor/bridge.
For NO sensor: Remove auxiliary circuit board.
Do not remove the auxiliary circuit board of the NO sensor until
immediately before installation. Do not leave the sensor without
auxiliary circuit board for longer than 15 minutes.
3
Fit the hose connections onto the new sensor.
4
Fit new sensor into the slot and at the same time fit the hose
connections onto the gas path connections.
Make sure that the socket on the sensor circuit board is
correctly connected to the contact plug.
5
Close the measuring instrument.

10.8 Clean modular flue gas probe

Disconnect flue gas probe from the measuring instrument.

1 Release probe catch by pressing the key on the probe handle and
remove probe module.
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