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Maintenance
Measuring cells
Measuring cell heater
Short-circuit bridge
Measuring
Auxiliary
circuit board
NO measur-
94
O2, CO, NO
- Switch off the device and isolate from the mains.
- Open the large cover on the rear of the measuring box.
- Remove measuring cell heater.
- Pull the hose connections from the used cell.
- Remove the measuring cell from the device.
- Insert and connect a new measuring cell.
The O2 measuring cell requires a compensation
period of approx. 60 min. after replacement in the
ments be made. The device must not be switched on
Installation of CO / NO
cell
Installation of an NO measuring cell
Remove the auxiliary circuit board before installing
ing cell
and NO measuring cell replacement
2
testo 300 XXL. Only then can accurate measure-
while doing this.
2
Caution!
Remove the short-circuit bridge when
installing a new measuring cell.
Caution!
measuring cell
Caution!
the NO cell.
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