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6
TEMPERATURE MEASUREMENT
High sensitivity and low cost make NTC thermistors the most
common device used for temperature measurement.
Non-linearity of the R -T curve generally leads to the use of
a resistor network to linearize the signal. An example is
given in Figure 6.
More precise measurements and temperature display can
also be achieved with simple electronic equipment as
shown in Figure 7.
The choice of the model will particularly take into account
the small size (better response time) and the resistance
tolerance. Mounting conditions (dissipation), and input volt-
age (self-heating) will also be carefully defined to avoid serious
errors in temperature measurement.
TEMPERATURE CONTROL
AND ALARM
NTC thermistors can be used as a simple on-off control tem-
perature system or temperature alarm system. Figure 8 gives
an example of such a circuit.
When the temperature increases to a defined value, the
resistance of the thermistor decreases and the current
becomes sufficiently high to energize the relay and provide
temperature alarm or heating system turn-off.
The high sensitivity of thermistors (about 4% resistance
change for 1°C) allows the temperature to be controlled very
precisely.
TEMPERATURE COMPENSATION
As many electronic components (integrated circuits, ampli-
fiers,...) have a positive temperature coefficient of resistance,
NTC thermistors represent a cheap and interesting solution
to compensate for this effect and provide an improved
temperature stability for electronic equipment.
It is necessary to include the thermistor in a resistor network
(Figure 10) calculated in such a manner that the network
coefficient compensates exactly for the positive temperature
coefficient of the other component (Figure 9).
Common leaded discs or chip thermistors are well suited for
this application.
Figure 6
Figure 7
NTC Thermistors
Application Notes
R2
R1
R3
R
NTC
Thermistor
circuit
A/D
converter
Display T
°C
μ processor
with R/T
algorithm
Resistance
Temperature
RTotal
RNTC
RC
R
R
RNTC
RC
R1
R2
R3
RNTC
Figure 8
Figure 9
Figure 10


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