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Condensation Prevention
The Product has a condensation-prevention feature that minimizes the possibility
of condensation when certain user settings are called for. At high humidities,
when the chamber dew point is within 2 °C of the actual chamber temperature, a
CAUTION message shows on the lower right hand corner of the display and the
controller slows the rate of temperature and humidity change. If the CAUTION
message shows, do not set temperatures significantly below the actual
temperature without first setting the humidity to a lower level.
For example, a UUT has verification points at 23 °C 90 % RH followed by 10 °C
90 % RH. The first set point, 23 °C and 90 % RH has a dew point of 21.3, within
2 °C of the actual temperature. When the chamber actual conditions reach this
set point, CAUTION shows on the display. Before setting the chamber to 10 °C,
set the humidity to about 1/2 the Actual (45 %). When that humidity is reached,
then set the Product to 10 °C 90 % RH.
A better verification pattern to avoid condensation would be to set
the lower dew point condition first, in this case 10
followed by 23
If condensation forms inside the chamber, the check desiccant or check water
indicator may be on, and/or the actual humidity is far off from the set humidity
after the typical stabilization time. See Remove Condensation.
Note
°
C 90 % RH.
RHapid-Cal Humidity Generator
°
C 90 % RH
Operation
21
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