Chapter 3 – Operation
Page 3-6
TestEquity 1016H & 1027H Temperature/Humidity Chamber
Humidity Operation
Humidity Mode Enable
The Humidity mode is enabled through Event 2 on the F4 Controller or the Humidity button on
the F4T Controller. This mode should only be ON if you are performing a controlled humidity
test within the temperature humidity range of the chamber as shown in the chart below.
Standard Humidity Range
This chamber is capable of controlling humidity from 10% RH to 95% RH over the temperature
range of +10
°
C to +85
°
C. The lowest possible humidity in the Standard Range varies depending
on the temperature, and is limited to a 6
°
C dew point. For example, +45
°
C is the lowest
temperature that 10% RH can be achieved. Below is a chart that shows the achievable range of
humidity as compared to temperature. Achieving low humidity levels require you to start with a
clean, dry chamber. For extended low humidity range below 6
°
C a dew point condition, see
“Purge Option” which follows.
The F4T/F4 will automatically disable the humidity system below +7
°
C and above +90
°
C to
protect the chamber.
Figure 3-2 – Achievable Range of Temperature/Humidity Conditions
Humidity Mode Considerations
The chamber workspace must be b7
°
C and +90
°
C. If the chamber is outside this
temperature range, the chamber will operate as though the Humidity Enable was OFF.
It takes several minutes for the humidifier to fill to the correct level after the water supply is
initially connected to an empty system. The humidifier function is disabled until the water level
is correct.
If you are running a high humidity condition, it can take approximately 5 minutes until the
humidifier heats up from an initial “cold start”. During most of that time, it might appear that
“nothing is happening” because there is little increase in the humidity reading. Be patient – if the
Humidity Light is ON, the humidity will eventually begin to rise after this initial heat-up period.
