What is one method to test a RTD sensor?

To test a Resistance Temperature Detector (RTD) sensor effectively, measuring the resistance with a digital multimeter and comparing the reading to a standard reference chart is the most accurate method. RTDs work on the principle that the resistance of metals changes predictably with temperature. By measuring the resistance at room temperature and then at various known temperatures, you can determine if the RTD is functioning properly by comparing your measurements to a predetermined resistance-temperature table.

This method allows for precise verification of the sensor's accuracy and integrity, as the resistance value can be directly related to temperature. If the resistance falls outside of the expected range for a corresponding temperature, it indicates that the sensor may be malfunctioning or outside its operational specification.

Using other methods to test an RTD may not provide the necessary accuracy or diagnostic capability. For instance, heating the sensor provides some indication of sensor performance but does not yield the precise relationship between resistance and temperature. Observing changes in output voltage is primarily applicable to other types of sensors and may not offer a reliable assessment for an RTD, which is designed to provide a resistance measurement rather than a voltage output. Checking for physical damage is a preliminary step and could help identify obvious issues but does not confirm the operational status of the RTD itself