RHapid-Cal Humidity Generator
Calibration
35
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A gas sample from the Sample Out port can be drawn with a chilled mirror
that has a pump, returning the gas into the Sample In port. A flow rate of
0.1 liters to 0.5 liters per minute is usually adequate. Ensure the chosen flow
rate does not cause excessive chamber temperature non-uniformity. Use
PTFE or stainless tubing for best results. See Figure 10.
Caution
When drawing gas out of the chamber in this method, the dew
point of the gas must be lower than ambient temperature,
otherwise heated tubes must be used to prevent the formation
of condensation in the tube.
ibw021.eps
Figure 10. Connections
