OPERATION
Page 3-9
SINGLE SET-POINT OPERATION - HUMIDITY
1. The Humidity system is turned ON/OFF through digital output #2. To
turn ON/OFF the humidity system:
Use the • • up and down arrow keys to navigate through the lower
display and place the arrow cursor on the digital out • eld.
a. Use the • right arrow key to enter the digital out • eld.
b. Use the • right arrow key to Event output 2.
b. Use the • • up and down arrow keys to select ON/OFF.
b. Use the • right arrow key to set the system ON/OFF.
c. Use the • left arrow keys to exit the digital out• eld and return to the
main page.
2. Use the arrow keys (up & down) to change the humidity set-point as
follows:
Use the • • up and down arrow keys to navigate through the lower
display and place the arrow cursor on setpoint 2.
a. Use the • right arrow key to enter the setpoint • eld.
b. Use the • • up and down arrow keys to change the setpoint.
c. Use the • • right or left arrow keys to exit the setpoint • eld.
3. When returning to temperature only operation, turn the humidity
system off. Failure to do this will result in the unit not reaching low
temperatures.
4. Verify that the demineralizer cartridge is fresh. The color of the cartridge
should be dark.
CHAMBER PERFORMANCE
The performance of your chamber is signi• cantly effected by the
characteristics of your test sample. Factors include size, material, shape,
weight and power dissipation if energized. The test sample should be
placed in the chamber in a manner that allows proper ventilation. Air fl ow
enters in the top left of the plenum and exits the top right.
Humidity performance will be
affected if live loads are placed
in the chamber when trying to
achieve certain humidity levels.
NOTE
When running at high humidity
levels for an extended period
of time, the tip of the humidity
sensor can become saturated,
resulting in erroneous readings.
To correct this condition, it is
recommended that the tip be
dried out by turning the humidity
system off and raising the
temperature to 250ºF/121°C for
10 minutes. The sensor accuracy
will be restored by evaporating
the water out of the porous
cover over the sensing element.
NOTE
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