MAX300-RTG: Installation Manual Hardware Installation
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of a component limits the pressure in the cylinder, a larger cylinder may be required
to increase the cylinder lifetime.
In general, three different classes of mixtures are used in calibration. The following
are Extrel CMS' recommendations for purity and grade:
1. Pure gases: Should be at least 99.999% pure, where the gas contains no
more than 10 ppm total impurities. For multiplier detector applications, the
gas should be 99.9999% pure.
2. Binary mixtures: These two gas mixtures should be at least 99.999% pure.
The accuracy of the reported concentrations is not critical unless the binary
is also to be used for sensitivity calibration. This would occur primarily when
a particular component is not stable in the multiblend mixture. If this is the
case, the sensitivity calibration for that component may be performed in the
binary gas instead.
3. Multiblend mixtures: Are intended to simulate the process stream.
Consequently, they should be as free of impurities as possible and be
certified to at least +/-2% relative accuracy.
Vent Lines
A “Flow By” configuration is when the sampling valve is plumbed for continuous
flow on all sample lines; this is so a fresh sample is delivered to the instrument for
analyzing (see Figures 13 - 16). The streams being analyzed have a separate vent;
1/4” compression fitting, connection.
The vacuum system vent has a 3/8” compression fitting. The vacuum system
exhaust may contain small amounts of vacuum pump oil as well as sample (See
Figures 1 - 6).
Note: Sample vent lines must be direct atmospheric pressure vents.
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