THE CAL TEMPERATURE
This device is one of the most sophisticated controllers available. It is of the differential proportional type and will operate over a very wide range of operating parameters (sample time, differential temperature, etc). These parameters can be altered manually, but the CAL controller incorporates an 'Auto Tune' function. Once activated, the controller will measure the response of the cell and optimise the monitoring and control parameters. Depending on the cell type and its operating temperature, it is almost always possible to control Ventacon cells to within 0.5°C of the set value. In most cases +0.1°C is easily achieved.
The actual temperature of the cell is displayed on the screen. Depressing one button reveals the set temperature, which can, of course, be altered at will. The CAL controller is fitted with a computer control facility and this reads out to a connector on the rear face of the power supply.
A set of CALComm software is supplied on disk. Once
loaded on the computer and connected to the power supply, the computer
duplicates all functions available through the button controls on
the CAL unit itself. In addition, it provides ramping facilities and
also timed 'holds' enabling the user to define a thermal programme.
One further advantage of using the CALComm system is that all thermal
data is logged.