RHapid-Cal Humidity Generator
Calibration
33
Using a Chilled Mirror Probe
There are different ways to use a chilled mirror with the Product. The subsequent
sections outline several of them:
•
You can draw a gas sample from the chamber as shown in Figure 8. The
tube to extract the sample is inserted into one of the ports. The chilled mirror
sensor needs its own pump to draw the sample from the chamber.
Experiment with the pump speed to draw enough gas for the chilled mirror to
work, but not so much that the Product performance is adversely affected. A
flow range of 0.1 liters to 0.5 liters per minute is usually adequate. Use PTFE
or stainless tubing for best results.
Caution
When drawing gas out of the chamber in this method, the dew
point of the gas must be lower than ambient temperature,
otherwise a heated tube must be used to prevent the formation
of condensation in the tube.
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Figure 8. Chilled Mirror with Pump Connections
