4000 4-/5-Gas Measuring Instruments Unit
Service Manual 5-1
5. 4-/5-Gas Measuring Instruments Unit
5.1 General
4-/5-gas subsystem
HC, CO, CO
2
, O
2
, NO
Fig. 5-1
The following components may be replaced in the field:
− Measurement cell
− Hoses
− Pressure sensors
− Pump
− Valve units
− Power supply unit
− Cable (repair or replacement)
Gas analyzer
subsystem
Power supply
unit
Pneumatics
unit
Gas
analyzer
Apart from the activities described below, the measuring
instruments unit may only be opened by the manufacturer
otherwise the P.E.F. (propane gas equivalent factor) may be
affected and that automatically necessitates official
recalibration.
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