M&C TechGroup PMA 50 EEX Operator's manual - Manual (Page 29)

29
Gas sampling and gas conditioning technology 9-3.15-ME
For the gas mixture in example 2 the rectified sum cross sensitivity then is calculated in good
approximation for 20,93 Vol.% oxygen:
0,7907 x -0,1182 Vol.% = -0,0935 Vol.%
The rectified sum cross sensitivity with change of sign now can be used for the correction of the
span calibration. In this case span has to be adjusted at:
20,93 Vol.% + 0,0935 Vol.% = 21,02 Vol.%.
21 CLOSING DOWN
In case of a short time closing down of the process control system, the analyser should remain
„ON“. No further precautions are required.
In case of a closing down of the analyser for a longer period, it is recommended to flush the an a-
lyser with dry and clean inert gas (eg. ambient air) in order to prevent a damage of the measuring
cell by aggressive and corrosive liquid gases.
22 STORAGE AND TRANSPORT
N O T E !
The analyser should be stored in a protected frost-proof area !
23 MAINTENANCE
Before carrying out any maintenance activities, the safety requirements specific to the instalment
and the process must be heeded!
W A R N I N G !
Dangerous voltage. Before carrying out any maintenance work,
take the analyser and all external switching circuits in connection
with the analyser off the mains.
For use in hazardous areas it is absolutely necessary to observe
the ex-instructions !
N O T E !
Only original spare parts and those corresponding to M&C
specifications must be used !
The physical measuring principle and the special design of the analyser are minimizing the mai n-
tenance requirements.