Temperature monitoring system with remote calibration capability

This paper proposes a novel implementation of self-calibration in a temperature monitoring system that employs thermocouple as a temperature sensor for propellant and highly inflammable storage facilities where human frequent intervention for calibration of temperature sensors is not affordable. In the proposed design, we have implemented a comparison methodology for calibration of these thermocouples. To realize this, a Peltier heater has been used as a heat source whose temperature is controlled by a micro-controller through MOSFET. A pair of thermocouples with different accuracies is mounted on each Peltier heater and the temperature difference between them is measured subsequently in steps. Flexibility to access the system both in wireless mode (using ZigBee module) or wired mode (using ETHERNET module) has been provided. A graphical user interface has been developed in LabVIEW to monitor the temperature, calibrate the thermocouples and also to simultaneously store the data. A detailed description of the system and relevant test results have been presented in the paper.