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SERVOPRO CHROMA Gas Analyser
107
04400001A / Revision 7
6.3 Gas installation
WARNING
Do not pressurise the analyser carrier or sample inlet as this may
cause irreversible damage to the quartz cell in the plasma
detector. Before supplying gas to the analyser remove the caps on
the vent connections. To prevent contamination of the analyser
gas line it is recommended to leave the caps on gas connections
until the gas installation is completed and ready to purge.
WARNING
This analyser is not to be used with any sample gases that form a
flammable mixture.
CAUTION
To comply with EMC requirements the pipe work shall be bonded to local
EMC earth
6.3.1
Choosing the right materials for the sampling system
The gas sampling system is crucial to achieving optimum analyser performance.
The gas sampling system includes any pressure regulator, valve, line, fitting, filter,
purifier, etc. which is in contact with the sample or carrier gas to be introduced
into the analyser. Even small leaks can introduce external contaminants originally
not present in the system. In most applications, leaks are atmospheric inboard
leakage.
For all gas line connections (including calibration and sample), the use of 1/8"
stainless steel tubing
(minimum wall thickness 0.028”)
in full length and with no
fittings is recommended. The material should meet ASTM69 specifications as
lower quality tubes may have irregularities on their circumference that will cause
poor seals with compression tube fittings.
Where fittings are required, compression tube fittings will eliminate the venturi
aspiration of outside contaminants. VCR face seal fittings use a metal-to-metal
seal to ensure the best quality leak tight connection for ppb analysis. The seal on
a VCR fitting is made when the gasket is compressed by two beads during the
connector engagement. Pipe thread connections should be avoided as they are
usually sealed with Teflon tape.
Содержание SERVOPRO Chroma
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