2.11
2.5 SAMPLE GAS CONNECTIONS
Before the gas is analysed it has to be conditioned to ensure that:-
1. The pressure range is correct.
2. Water and/or solvents are removed.
3. Dust is removed by filtering.
4. Flow is controlled.
The 1161 sampling system (for dry gases) or the 1162 (for wet gases) are suitable for many
applications. Servomex can advise and supply sampling systems for more rigorous applications.
Correct conditioning of the sample gases will greatly improve the reliability of the analyser. Most
analyser faults are caused by inadequate sample conditioning.
The standard analyser is fitted with 1/8 in o.d. tubes which project from the base of the transducer
unit. These provide inlet and outlet connections to the measuring cell. (Refer to Figure 2.5 (a)).
A cover, which is fitted over the tubes to protect them during transit, should be removed to access
the connections.
Do not bend the inlet and outlet pipes emerging from the bottom of the transducer. Servicing
difficulties will be encountered if these pipes are bent or have metal ferrules attached. It is
recommended that 'O' ring fittings are used for inlet and outlet connections.
If a Servomex sampling system is not used then the sample requirements are:
Inlet pressure 0.3kPa (50mm wg) maximum relative to vent pressure.
to analyser:
Maximum Sample 28kPag (4psig) relative to atmosphere.
Pressure:
Cell flow rate: Cell types 325 and 364: 250ml(air)/minute maximum.
Cell type 313: 150ml/min for cell type 313.
Cell type 312: 200ml/min for cell type 312.
Dew point:
1131 and 1133 5°C (9°F) below lowest ambient
transducers: temperature.
1132 transducer: Less than 105°C (221°F).
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