TESTO 300 LL - Change CO, CO H2 and NO sensor

10 Maintenance
68
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.
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