User guide

11
NOTE: The Ready status light will be red while the oven is changing temperature.
Once the oven temperature is within the control limits, the status indicator will
change to green.
Setting the Oven Temperature Limit
A mechanical thermostat is integrated with the temperature control circuit for
fail-safe temperature control to a limit set on the front panel. The thermostat
prevents accidental overheating of low temperature permeation devices or of
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. Do not install any permeation
devices yet.
3. Set the chamber temperature 5°C higher than the desired operating temperature,
and wait for the status indicator to change from red to green, indicating that
the chamber has equilibrated.
4. Once thermal equilibrium is achieved, slowly adjust the setting clockwise until
the touch screen displays a box indicating “PFAIL”. (You may hear a faint click.)
Initial Set-Up
Figure 5: Model 235 Manual screen
READY STATUS LIGHT
Figure 6: Model 235 PFAIL indication