Basic Type K Thermocouple Meter
Created: May 23, 2016
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A thermocouple is an electrical device for measuring temperature. It consists of two wires of different metals at two points. Thermocouples are based on the principle of seebeck effect in which two wires made of dissimilar materials connected will generate a potential between the two junctions that is proportional to the difference in temperature. One of the advantages of thermocouples among other temperature sensors is its rugged construction. Also, it covers a wide variety of temperature range, offers good reproducibility and has a high-speed response. Type "K" thermocouples are widely used for temperature measurement and control up to about 2000°F. They operate very well in oxidizing atmospheres.
This reference design is a basic type K thermocouple meter that uses PIC16F73 as the main controller. This design also utilizes LTC2485, which is a low power, 24-Bit delta-sigma analog-to-digital converter (ADC). As shown in the schematics, the ADC will convert the voltage measured by the thermocouple into a digital signal. The data will then be sent to the PIC16F73 via I2C interface. After the PIC16F73 processed the data received from the LTC2485, it will display the measured temperature to the 16x2 LCD display.
This design can measure temperatures within the range of −330 °F to +2460 °F. This is useful in a broad range of applications that include temperature monitoring. Type K thermocouples are used extensively in the steel and iron industries to monitor temperatures that helps in maintaining to operate safely.