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Site Preparation
Assembling the gas plumbing
Carrier gas miser
A carrier gas miser reduces the use of carrier gas during off•hours.It
reduces two channels of carrier gas flow to a low purging rate during
off•hours,without disturbing the pressure regulator or flow controller
settings.
Carrier Gas Miser
Making pipe thread connections
Avoid pipe thread connections if possible. If they must be used, seal them
with Teflon tape. Do not use pipe dope to seal the threads; these
mixtures contain volatile materials that will contaminate the tubing.
Teflon tape is available in two grades. The less expensive hardware
store grade contains a small amount of volatile material. In most cases
this does no harm, but it will interfere strongly (noise, elevated baseline,
reduced sensitivity and linearity) with electron capture detectors. An
instrument grade (the name may vary) has had these volatiles removed.
The better grade tape is recommended for all chromatographic fittings.
16
CONSERVE
FLO
W
FULL
A
CONSERVE
FLO
W
B
FULL
5890
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