TEMPERATURE - THERMISTORS
TEMPERATURE - THERMISTORS
Temperature Sensors -
Thermistors
Thermistors change resistance with a change in temperature. They do
not amplify, rectify, polarize or generate a signal. The thermistor
temperature may be changed by the surrounding temperature or by
self-heating the thermistor by passing a current through it.
Most applications such as temperature measurement and control or
copper coil compensation require that the power dispersed in a
thermistor be kept to a minimum so as not to perceptibly self-heat the
thermistor. Other applications depend entirely on the self-heating effect.
When the surrounding temperature is fixed, the resistance of a thermistor
is largely a function of power being dispersed within it, raising its
temperature above its environment. Under these operating conditions,
the temperature may rise 100 °C to 200 °C [121 °F to 392 °F] and the
resistance may be lowered to 1/1000
th
of its original value at low current.
This self-heating characteristic provides a whole field of uses for the
thermistor. In the self-heat state it is thermally sensitive (its resistance will
be changed) to any condition, changing the rate at which heat is
conducted away from it. If the rate of heat removal is ideally fixed, then
the thermistor is sensitive to power input and suited for use in voltage or
power level control applications.
Glass Encapsulated Chip (GEC)
Thermistors
The GECs are high-quality, hermetically-sealed, glass-encapsulated chip
thermistors in an axial lead package. They cover the full temperature
range of -60 °C to 300 °C [-76 °F to 572 °F]. These rugged sensors are
designed for applications which demand reliability at low cost. The
uniform dimensions are ideally suited for automated assembly.
Operating temperature:
-60 °C to 300 °C [-76 °F to 572 °F]
Encapsulation:
DO-35 glass
Lead material:
Tinned copper-clad steel
Dissipation constant (DC):
2.5 mW/°C in still air min.
Time constant (TC):
4 s in still air max.
Resistance range at 25 °C [77 °F]:
1 kOhm to 1 MOhm
OPTIONS
At 25 °C [77 °F]
OHM
1,000
2,000
3,000
5,000
5,000
10,000
10,000
10,000
20,000
30,000
50,000
50,000
100,000
100,000
200,000
500,000
1M
% TOLERANCE
10
10
10
5
10
5
10
5
10
10
5
10
5
10
10
10
10
R/T CURVE
10A
10
10
10
10
10
16
16
16
16
16
16
16
16
1
1
1
REFERENCE
135-102DAG-J01
135-202FAG-J01
135-302FAG-J01
135-502FAF-J01
135-502FAG-J01
135-103FAF-J01
135-103FAG-J01
135-103LAF-J01
135-203LAG-J01
135-303KAG-J01
135-503LAF-J01
135-503LAG-J01
135-104LAF-J01
135-104LAG-J01
135-204QAG-J01
135-504QAG-J01
135-105QAG-J01
CHIP
THERMISTOR
GLASS
ENCAPSULATION
28,6
[1.125]
2,0 DIA.
[0.08]
Interchangeable R/T curve matched
±1 °C from 0 °C to 100 °C [32 °F to 212 °F]
OHM
10,000
20,000
30,000
50,000
100,000
R/T CURVE
16
16
16
16
16
REFERENCE
135-103LFW-J01
135-203LFW-J01
135-303LFW-J01
135-503LFW-J01
135-104LFW-J01
4,6
[0.81]
0,51 DIA. TINNED COPPER CLAD STEEL
[0.020]
18
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