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Chapter 7 - Temperature Measurement: Integrated-Circuit Temperature Sensors

By Thomas A. Hughes
From Measurement and Control Basics Fourth Edition

Integrated-circuit temperature transducers are available in both voltage
and current-output configurations (Figure 7-20). Both supply an output

EXAMPLE 7-8

Problem: A typical thermistor has the following coefficients for the Steinhart-Hart equation:

Calculate the temperature when the resistance is 4000 Ω.

Solution: Using Equation 7-11, we obtain the following:

Now convert from Kelvin to Celsius:

that is linearly proportional to absolute temperature. Typical values are
one microampere of current per one-degree temperature change in Kelvin
(1 μA/K) and ten millivolts per one-degree change in Kelvin (10 mv/K).

Except for the fact that these devices provide an output that is very linear
with temperature, they share all the disadvantages of thermistors. They
are semiconductor devices and thus have a limited temperature range.

Figure 7-20. Integrated-circuit temperature transducers

Integrated-circuit temperature sensors are normally only used in applications
that have a limited temperature range. One typical application is in
temperature data acquisition systems where they are used for thermocouple
compensation.

© 2007 ISA
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