Permanently Fixed Temperature Sensor Calibration

Probes, transmitters and other temperature sensors that are permanently mounted in freeze driers (lypohilizer), freezers, fridges, incubators, stability chambers, environmental chambers, ovens, dry heat sterilizers (depyrogentator) and warehouses can provide challenges when calibrating and verifying. Some sensors can be permanently fixed or difficult to remove, making calibrating with a single-point of verification the easiest choice. To ensure quality assurance, single-point verification is most effective when combined with other trends and information related to the process and equipment. To complete a single-point verification, use the Fluke Calibration 1523 or 1524 Reference Thermometer as the readout with a reference RTD or PRT (PRT are recommended) which will allow data logging to capture trends. Usually, the RTD or PRT is placed in thermal equilibrium next to the sensor, without removing it from the process. If applicable, wire the RTD and PRT through the door or gasket. Once it stabilizes, gather the readings to complete a single-point verification. Choosing the correct probe is important in this application, check out the selection guide below or reach out to one of our Fluke Experts for advice on your specific application.