• the cylinders are securely located.
• the cylinders are fitted with a two-stage regulator.
• the cylinders contain the correct gas mixture for use.
• the cylinders are connected to the correct ‘entry’ on the Instrument.
• the cylinder's Output Pressure regulator is 'OFF'.
During use, check -
• the Instrument is 'ON'.
• the Sample Pump is 'ON'.
• the Output Pressure regulator is set for 0.2 Bar.
After use, check -
• the Output Pressure regulator is turned 'OFF'.
• the cylinder tap is turned 'OFF'.
• if the Instrument is in ‘Standby’, turn 'OFF' the Sample Pump.
Following a cylinder change, it is advisable to initiate a Span or Zero cycle a few minutes after
the supply is re-connected.
2.10.2 Gas Leaks
All external-piping connections must be checked for gas leaks, to ensure that no gases are
leaking to the local area (which may be a health hazard), and that no uncontrolled air or gas is
drawn into the Instrument (and so affect the measurement).
Applying water containing a mild soap solution can check connections under pressure. Do not
increase the pressure to check for leaks (or for any other reason), since this may damage the
Instrument.
Connections of pipes under nominally ambient pressure, such as the sample piping, are difficult
to check for leaks, but can be checked for tightness.
2.10.3 Exhausting & Ventilation
Because any gas is potentially toxic, and, some may be inflammable, the gas must be
exhausted to where it will be rapidly dispersed. For the same reasons, the Instrument and its
environment including the location of gas cylinders must be properly ventilated to minimise the
dangers of gas leaks.
If Span cylinders contain hazardous or inflammable gases, they must carry suitable warning
labels, and if inflammable, must be located in a suitable ‘Inflammable Store’ when in use or in
storage.
In all cases the local safety regulations must be consulted and followed.
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