H300P Temperature Humidity Chamber
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Figure 3: Chamber Controls
Chamber Door
The chamber door needs to be sealed for the chamber to maintain proper humidity and temperature.
Tighten the three door nuts until the white rubber gaskets start to compress. Do not overtighten the nuts.
It is unnecessary and will decrease the life of the door rubber gaskets.
Humidity Control
The water in the water reservoir inside the H300P is heated by an internal heater. Depending on the
amount of water in the reservoir, it may take as much as 30 minutes for the water to reach its target
temperature. The H300P chamber can be used before the temperature reaches its target in most cases.
However, when trying to achieve high humidity (above 75%RH) at high temperatures (above 90°F, 32°C), you
may have to wait for the water in the reservoir to heat up.
Note that the water in the reservoir will warm up whenever the H300P is ON, even if the CONT switch is
turned to OFF.
Controlling High Humidity
When the chamber is controlling humidity above 80%RH, there is a limit on how high the humidity inside the
chamber can climb. This limit mostly depends on the temperature inside the chamber. Approximate
maximum humidity limits vs. chamber temperature are shown in Figure 4.
