The self-calibrating thermocouple is a thermocouple with a low melting point, high-purity metal encapsulated near but metallurgically isolated from its thermojunction. It is designed to provide a single-point calibration of the thermocouple at the melting point of the encapsulated metal because the time-temperature curve of the thermocouple will plateau at this temperature during heating or cooling. The calibration procedure consists of comparing the plateau temperature with the known melting point temperature of the encapsulated metal. The difference between these two values is the thermocouple error at the calibration point. The device is commercially available, but to be effective in industry it must be augmented with a data acquisition system with an algorithm that will automatically report the calibration error.
Presented at the Sensor's Expo 1989
- Pub Date:
- Error Analysis;
- Data Acquisition;
- Temperature Measurement;
- Instrumentation and Photography