VICI 340 Dynacalibrator - Manual (Page 20)

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The front panel displays the current chamber temperature and the control status
of the instrument, indicated by the PNL and TMP lights. (Refer to Figure 4 on page 13.)
The chamber temperature can be set manually through the controls on the front
panel or remotely through RS-232 communication. (Refer to the chapter entitled
“Serial Port Communications” on page 20). After a temperature set point is entered
by either method, it is written to memory so that after a power failure the unit
will return to the condition previously established.
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 entitled
“Serial Port Communications” on page 20.)
Setting the Oven Temperature Limit
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:
1. Using a flat-tipped screw driver or the tool provided, adjust the setting 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 before the power is
turned back on.
Initial Power-Up