3.4
3.2 PRE START CHECKS
Before power is supplied or sample gas introduced ensure that the analyser is correctly
installed by checking the following:
1. Check that the transformer voltage tapping is correctly set to agree with the supply
voltage.
2. Perform a leak test on both the Transducer unit and any sampling system fitted.
3. Remove any packing material.
4. If a Servomex sampling system is not supplied with the analyser check that the sample
condition requirements are met. (See Section 2.5).
3.2.1 Setting Sample Gas Flows
1. With 1161 Dry Gas Sampling System
a. Close both needle valves.
b. Check sample pressure is within the range 0.3 to 20 psig (2 to 140kPa).
c. Open bypass needle valve (left hand flowmeter) to give desired flowrate.
d. Open cell flow needle valve to give a flowrate dependant on cell type as follows:
325 and 364 cells - approx 200ml/min
312 and 313 cells - approx 100ml/min
CAUTION
Too high a gas flowrate through the cell may permanently damage the cell.
When the density or viscosity of the sample gas differs significantly from air, the
calibration of the flowmeter will not indicate the same volume rates.
For example:
Sample gas: Air at 50ml/min is equivalent to:
Hydrogen 200ml/min
Ethylene 130ml/min
Argon 65ml/min
Helium 90ml/min
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