VICI 450 Dynacalibrator - Manual (Page 22)

18
Setting the Chamber Temperature Manually
To read the current set point: press and hold the button.
To read the chassis environment temperature: press and hold the button.
1. To set the desired temperature, simultaneously press the and buttons,
then release them. The PNL light will start flashing, indicating the controller is
in the temperature set mode.
2. Use the and buttons to reach the desired temperature set point.
NOTE: Maximum temperature set point is 110°C; minimum is 30°C.
3. To enter or register the desired temperature set point, simultaneously press
the and buttons, then release them. The PNL light will stop flashing. If
the set point is not entered, after two minutes the controller will ignore the
temperature in Step 2 and revert to its previous status.
To prevent the set point from being accidentally changed, the front panel
controls can be disabled with a serial command. Refer to the section titled
“Serial Port Communications” on page 20.
Setting the Chamber Temperature Limit Switch
A mechanical thermostat is integrated with the temperature control circuit
for fail-safe temperature control. This thermostat should be used to prevent
accidental overheating of low temperature permeation devices or permeation
devices containing toxic or hazardous chemicals. Overheating can rupture the
device or cause an unintended release of chemicals.
The temperature markings on the front panel are approximate (±10°C). For a
more accurate setting:
Remove all permeation devices from the permeation cham-
ber before beginning this procedure. (If necessary, refer to
the next page for instructions on opening the permeation
chamber.)
1. Using a flat-tipped screw driver or the tool provided, turn the limit switch all
the way clockwise.
2. Turn on the Dynacalibrator main power and heater power. Do not install any
permeation devices yet.
3. Set the chamber temperature 5°C higher than the desired operating
temperature, and wait for temperature equilibrium.
4. After equilibrium, slowly rotate the limit switch counterclockwise until the
display reads “PFAIL”. (You may hear a faint click.)
5. Turn off the heater power switch and wait 15-20 minutes for the chamber to
cool.
6. Turn on the heater power switch and set the chamber operating temperature.
When PFAIL occurs, the Dynacalibrator must be turned off
long enough for the chamber to cool below the desired
PFAIL set point to reset the PFAIL error. Turning the unit
on too early will indicate another PFAIL error, and require
another power off/on cycle to reset the error.
Initial Power-Up