By Tony Fischer-Cripps
Tony Fischer-Cripps is a venture chief within the department of Telecommunications and commercial Physics of the CSIRO (Commonwealth clinical & business learn Organisation), Australia. He was once formerly lecturer, collage of expertise, Sydney (UTS), Australia, and has additionally labored for the nationwide Institute of criteria and know-how, united states (NIST, previously nationwide Bureau of criteria - NBS).
*The crucial pocket reference for engineers and students
*Interfacing in motion: desktops, PLCs, transducers and instrumentation in a single book
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Extra resources for Newnes Interfacing Companion: Computers, Transducers, Instrumentation and Signal Processing
Out To To A third terminal on the device allows the output to be calibrated against adj a known reference temperature. 2 Temperature 31 Now, the thermocouple output voltage is determined by the temperature difference between the hot and cold junctions and the relative thermoelectric sensitivity of the metals. 0 Copper/constantan T Iron/constantan J Chromel/alumel K The voltage output from the LM335 has to be matched with the voltage range of the thermocouple material and this can be done using a simple voltage divider resistor network.
Let us work with the range 0 to 100 oC. 1 mV. A convenient voltage gain required would thus be about 1000 to give an analog input of around 4 V to the ADC. The overall aims of the project activity in this book are to: 1. Design, build and test a thermocouple circuit which employs cold junction compensation. The output of the circuit is to be a differential voltage which is proportional to the temperature of the hot junction of the thermocouple over the range 0−100 oC. 2. Construct an instrumentation amplifier which will take in the voltage levels from a cold-compensated thermocouple circuit and provide a 0−5 V output voltage which is proportional to the temperature of the hot junction of the thermocouple (oC).
This can be achieved by keeping the voltage across the standard resistor a constant using the rheostat. The change in voltage on the measuring potentiometer is thus due to a change in temperature only. 0 Ω at 0 °C. The change in resistance over a temperature range of 0 to 100 oC is called the fundamental interval and fixes the sensitivity of the device. 5 Ω is specified in BS1904 for temperature ranges up to 600 oC. 000 Ω. 1 MΩ to avoid selfheating. 5 Liquid-in-glass thermometer A common thermometer in industry is the liquid-in-glass type which might contain either mercury or alcohol.