In the conventional thermocouple based digital temperature indicator the millivolt signal obtained from a thermocouple is first amplified and then converted into a digital signal by using analog-to-digital converter (ADC). This digital signal is then indicated as digital display of temperature using digital counter circuit or microprocessor/microcontroller based circuitry. In the present paper a modified AD conversion technique along with opto-isolation is used to indicate digitally the temperature without using any conventional analog-to-digital converter. The theory and design of the measuring technique are described in the paper. The non-linearity of thermocouple is eliminated by using look-up table within software program. The performance of the circuit has been experimentally tested by using mV input signal instead of a thermocouple as well as using a K-type thermocouple. The experimental results are reported in the paper.

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ad conversion technique thermocouple based digital temperature indicator millivolt signal optoisolation analogtodigital converter lookup table within software digital counter circuit ktype microprocessormicrocontroller based circuitry nonlinearity of thermocouple

S. C. BERA,D. N. KOLE,.A Modified Design of a Thermocouple Based Digital Temperature Indicator with Opto-Isolation. 87 (1),.

S. C. BERA,D. N. KOLE,"A Modified Design of a Thermocouple Based Digital Temperature Indicator with Opto-Isolation" 87

S. C. BERA,D. N. KOLE,"A Modified Design of a Thermocouple Based Digital Temperature Indicator with Opto-Isolation"