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CAUTION!
If the Dry Well Calibrator is not used for a long period, it is possible that moisture
penetrates into the heating elements due to the materials used (magnesium oxide).
After transportation or storage of the calibrator in humid environments, the heating
elements must be preheated slowly. During the drying process it is assumed that the
calibrator has not yet reached the required electrical isolation voltage for the stated
protection class.
6.6.
Viewing the current temperature and the set point temperature
Upper Display – PV – Process Value
The 4-digit red seven segment display shows the current temperature of the Dry Well Calibrator.
Lower Display – SV – Set Value
The 4-digit green seven segment display shows the Set Point temperature of the Dry Well
Calibrator. After reaching the set point temperature, the PID controller will maintain a stable
temperature in the Dry Well by delivering short pulses of heating or cooling energy to it.
LED Indicators
The red LED OUT 1 indicates the heating status. During the heating phase a constant LED OUT 1
“ON” indicates the continuous input of heat energy. A flashing LED means that the Set Point
temperature will be reached soon or has been reached and the controller is cycling power to the
heater by delivering short pulses of energy, in order to maintain stability.
The red LED OUT 2 indicates cooling status. A constant LED OUT 2 “ON” indicates the continuous
input of cooling energy. A flashing LED means that the Set Point temperature will be reached soon
or has been reached and the controller is cycling power to the cooler by delivering short pulses of
energy, in order to maintain stability.
To ensure proper temperature stability the cycle time of the controller is set to a low level and the
control output is activated with high frequency.
7.
Dry Well Calibrator temperature controller operation
7.1.
Temperature controller modes of operation
Calibration mode:
Normal operating mode. The calibrator will heat or cool until the set point
temperature is reached and then maintain it at the set temperature. When the temperature
stabilizes it will be ready for use.
Set Point Adjustment mode:
This mode allows editing of the set point temperature.
