PT100

Thermal Calibration

Verification of these sensors requires the application of a known thermal bath to measure the output against a certified reference. Calibration labs record the resistance deviation across several fixed points to calculate the specific drift of a production unit. Discrepancies between the sensor response and the standard curve provide the basis for the adjustment factors programmed into the host controller.

Systematic testing ensures the component accuracy remains within the defined tolerance class during prolonged field duty.

System Integration

Integration of the device involves connecting the sensing leads to a signal conditioning circuit that converts the variable resistance into a standardized digital or analog output. A three wire configuration compensates for the resistance inherent in the lead wires by providing a separate path to measure the cable contribution. Four wire setups offer the highest level of precision by eliminating lead resistance effects through the use of independent excitation and sense circuits.

Proper shielding prevents electrical noise from distorting the small resistance changes detected at the sensor junction.

Mechanical Specification

Mounting the probe into an industrial thermowell protects the delicate platinum winding from corrosive process media or high mechanical stress. The assembly depth must reach the center of the flow stream to avoid heat conduction errors from the external piping walls. Stainless steel sheaths provide the rigidity required for insertion into pressurized vessels while maintaining a fast response time to thermal variations.

Robust housing protects the electrical contacts from environmental contaminants found in heavy machinery environments.