2.12
Temperature:
1131 and 1133 50°C (122°F) maximum,
transducers: ! 10°C (14°F) minimum at
analyser inlet.
1132 transducer: 105°C (221°F) maximum,
! 10°C (14°F) minimum at
analyser inlet.
The sample must be dry and clean with a maximum particulate size of 3 micron.
It will be necessary to regulate the sample pressure and flow to ensure stable operation and to
prevent damage to the measuring cell. If a sample pump is used then precautions may be
necessary to prevent pressure pulsing.
The exhaust from the transducer should not be constricted. If the exhaust is piped away then, to
avoid a back pressure in the cell, the diameter of the piping used should be greater than the inlet
piping.
Note that if pressure compensation is fitted then facilities have to be made available for calibration.
These are provided with the 1161 dry gas sample system. If this is not used then there has to be
a means of putting a stable back pressure on the analyser of about 7kPa (0.7psig).
Sample pipework should be tested to ensure it is leak free. When using oxygen enriched (>21%
O
2
) sample gases in hazardous areas it is a condition of safety certification that pipework should be
of metal.
Figure 2.6 shows schematically systems which give good regulation of flow through the sample cell.
If venting to atmosphere, ensure local environmental regulations are not violated.
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