2.16
2.5.1 1131 and 1133 Transducers Gas Connections:
If a Servomex type 1161 or 1162 sampling system has been supplied, this must be mounted
beneath the transducer unit and connected as shown in Figure 2.7. The sample gas inlet connection
to the sampling system is a Rp 1/4 (1/4 in.BSPP) fitting for the 1161 dry gas sampling system;
1/4" o.d. tube for the 1162 wet gas sampling system.
The 1161 dry gas sampling system will keep the flow of sample gas through the measuring cell
essentially constant for a wide variation in sample pressures or bypass flowrates.
Note that if pressure compensation has been specified a calibrating valve will have been supplied
as a loose item. This should be installed on the bypass flowmeter as shown in Figure 2.7 (a).
The 1162 is suitable for use with sample gases containing low levels of water or condensed
solvents. If high levels of condensation may occur then it is recommended that the dew point of the
sample gas is reduced before it is introduced into the analyser.
Information on sample requirements for the 1161 or 1162 sampling systems is given in Appendix 8,
Sections 6 and 7.
Check that the materials of the sampling system are compatible with the sample gases.
2.5.2 1132 Transducer Gas Connections
This transducer is suitable for use with sample gases which have a dew point between ambient
temperature and 105°C (221°F). The sample system must be heated from the sample take-off point
to the 1132 transducer. Particular care must be taken to avoid cold spots where condensation may
occur especially between the sample conditioning system and the transducer.
See Figure 2.5(b).
2.6 ELECTRICAL SUPPLY
WARNING
Since an isolating switch is not fitted to this instrument it is necessary
to ensure that the electricity supply is fitted with a switch to disconnect
the instrument.
The instrument cases must be connected to earth (ground) at all times.
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