2.7 Gas Arrangements
2.7.1 The Gas Circuit
The gas connections within the instrument are shown on the gas circuit enclosed with this
manual. The gas circuit is quite specific to a particular instrument and shows how the gas is
routed from the inlets to individual analysis bench(s). Gas connections are via 'entries' that are
located on the rear panel.
All external connections are made with 6.35mm (1/4'') pipe fittings. The type of piping used is
recommended to be either polythene for general use or polytetraflurothalene (PTFE) or
stainless steel for corrosive gases.
All entries are fitted with in-line filters that are intended to stop any foreign matter entering the
instrument as a last resort. Unless the gas is perfectly clean and dry, particulate filters
and / or driers must be fitted externally. Contact ADC (Spares & Service) Ltd. or their
authorised local agents for advice.
The requirements for particular gases vary with the application and therefore these and the gas
circuit are specific to the delivered Instrument. Some guidelines follow, but it is the
responsibility of the installer to ensure that all safety and other requirements are met.
The Instrument Specification accompanying the Instrument defines the specific requirements
and this must be referred to during installation.
WARNING
• All Gases are potentially toxic and hazardous to health.
• All gas lines and connections must be leak-tight. Joints can be checked by
applying water containing some liquid soap and looking for bubbles.
• Exhaust lines must be properly vented and arranged to prevent blockage.
• Ventilate the enclosure to prevent a build-up of gas in the event of a leak.
2.7.2 The Sample Gas
The gas to be measured is the 'sample gas' labelled 'GAS IN'. After passing through the gas
circuit the measurement gases are exhausted at the entry labelled 'GAS OUT'. The analyser is
designed to receive sample gas at nominally atmospheric pressure, using the internal sample
pump to control the flow.
The Sample Gas supplied to the Instrument must be relatively clean, cool and of low moisture
content. Samples containing dust or particulates must be filtered externally and the filters
serviced at regular intervals.
Hot Samples with high moisture content should be passed through a water trap or dissector
after cooling.
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