In many applications, heating elements are employed to heat a product in an oven, furnace, or with jets of hot air. Conventional control devices using contact thermocouples measure and control the oven air temperature, IR heating element or air jet temperature, in an effort to maintain the correct product temperature and, therefore, quality. But often, the results are less than satisfactory.
Replacing the contact thermocouple (measuring, for example, oven temperature) with a non-contact IRt/c to measure the product temperature directly, will ensure that the correct temperature is maintained.
Some readjustment of the controller parameters may be required because of differences in sensor response times – an IRt/c is much faster. After installing the IRt/c and calibrating the controller reading using a Microscanner D-Series, initiate the self-tuning cycle of the controller and check to see that the control is stable and accurate. If it will not self-tune properly, manually adjust the control coefficients to achieve stable control. Because the product temperature is likely to change more slowly than that of the original sensor, start by slowly increasing the ‘D’ factor of the PID coefficients.
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