H300P Temperature Humidity Chamber
Page 9
Chamber
Temperature °F
Max Humidity
70°F
100°F
45°F
120°F
95%RH
80%RH
60%RH
Figure 4: Maximum Chamber Humidity vs. Temperature
When operating the chamber below 70°F, small amount of condensation inside the chamber is possible
when the humidity inside the chamber is above 80%RH. As the chamber tries to increase humidity, it pumps
warm vapor into the chamber. At the same time, it tries to control the temperature, causing the
temperature control fins to cool and fall below the dew point. This causes condensation on the fins. Small
amount of condensation will not harm the chamber, but will prevent humidity increasing above the limits
shown in Figure 4. Any condensation can be wiped off with a paper towel.
Make sure not to touch the sensor assembly at the top of the chamber when wiping off condensation.
Watlow PM PLUS Controllers
The H300P unit uses the Watlow PM PLUS controllers. The controller User’s Manual has been provided with
the H300P chamber. In general you should not need to reference this manual, unless you are setting up a
profile.
The summary of the PM PLUS front panel controls are shown below
