Vici 450 Dynacalibrator Manual de usuario descargar pdf (Pagina 22)

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

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Vici 450 Dynacalibrator Manual de usuario Pagina 22

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