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Custom gas
In practice, some empirical modification is required; this helps to compensate
for the non-ideal performance of the meter. For example, the actual factor for
argon is 1.395, rather than the 1.401 estimated in the example. Please consult
AMETEK Process Instruments for assistance, before running gases that are not
listed in the menu on the 5830 Analyzer.
Gas Saver
PN 583054901, Rev YA
If you press the Custom Gas selection, you will be prompted to enter a
Gas K Factor. The Gas K Factor is a parameter used by the Mass Flow
Meter in the 5830 to adjust for the molar heat capacities of different gases.
Nitrogen is used as the Reference gas for the K factors, and its value is de-
fined as 1.000. To estimate the K factor for another gas, take the ratio of the
molar heat capacity (constant pressure) of nitrogen to that of the sample
gas. For example, the K factor of argon would be estimated as follows:
Molar heat capacity of nitrogen
Molar heat capacity of argon
K factor
K factor
Do not enter a K-factor less than 0.25. A K-factor less than 0.25 will
cause erroneous flow and Moisture Generator readings. Contact Am-
etek for support.
If a custom gas is entered, the conversion to units of dew point will be
based on an ideal gas model, without any enhancement factor.
In the default configuration the 5830 Analyzer runs with the internal by-
pass valve open, so that the total flow through the analyzer is greater than
1 SLPM. This high sample flow rate helps to improve the response speed
of the system. The gas-saver feature allows the user to control the state of
the bypass valve. The operation of the valve can be controlled by selecting
either Enable (to close the bypass valve) or Disable (to open the bypass
valve) for the gas-saver option.
= 29.12 JK-1mole-1
= 20.79 JK-1mole-1
= 29.12 JK-1mole-1/20.79 JK-1mole-1
= 1.401
Controller/Interface
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3-9
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