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STUDY OF TEMPERATURE TRANSDUCERS STT-01

Temperature controlled oven with digital display
Instrumentation amplifier with gain switching
Digital voltmeter
Interfacing circuits for common transducers

Introduction
Measurement of temperature is an important task in a large number of physical processes. A transducer in a device which converts the temperature information into an electrical signal, usually voltage, for an automated processing. A very wide variety of temperature transducers are commonly available which differ from each other with regards to there: a) Range of operation
b) Sensitivity and linearity
c) Accuracy, Stability and Repeatability
d) Speed of response
The present experiments has been designed to study the input-output characteristics of some common transducers like, thermistors (PTC and NTC), thermocouple, semiconductor sensors and may be extended to also study the temperature coefficients of resistances.
The main requirements for an experiment of this nature are, a) A precisely controlled from oven with a temperature display which is fast b) An adjustable gain instrumentation amplifier which may be used to amplify the different levels of signals from transducers
c) Interfacing circuits suitable for the transducers used

Description

Experiments
Temperature-output voltage characteristics of the following transducers in the temperature range of room temperature to 150o C and determination of their parameters
Chromel – Alumel thermocouple
Copper – Constantan thermocouple
Thermistors – Positive Temperature Coefficient – Negative Temperature Coefficient
Semiconductor sensor (type AD590), upto 90oC only

Features and Specifications
Temperature controlled oven upto 150oC with digital temperature display
Digital voltmeter on the panel for sensor output measurement
Built-in interfacing circuit and switched gain instrumentation amplifier
IC regulated power supplies and detailed manual

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