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NTC
Thermistors
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CWF
Precision NTC Thermistor Probes for Temperature
Measurement
The CWF
series NTC Thermistors are supplied in 5 basic styles
of enclosures designed to facilitate installation
in a wide variety of applications. PVC leads are
applied to a precision, high-reliability NTC thermistor,
insulated with heat conductive water resistant materials
and potted into any of a wide variety of probe bodies.
CWF thermistors are also available with custom housings
or custom lead lengths for remote sensing and temperature
control in difficult conditions.
Also
see the Cantherm Thermistor
Probe section for additional models.
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Application
• Heating, Ventilation & Air Conditioning
• Temperature Regulation and Measurement
• Automotive Electronics
• Water Heaters
• Household Appliances such as refrigerators,
water coolers, dishwashers and many others
Characteristics
• Wide variety of installation fixtures and
probes are available to suit your needs.
• Small size and fast response (temperature
coefficient of resistance can reach- (2~5%/°C)
• Long-term Stability and Reliability (yearly
drift of ≤1%)
• Excellent Tolerance and Interchangeability
(the accuracy of R and B value can be ±1%)
• Double layer packaging provides excellent
insulation and high strength and impact resistance.
• Dissipation Constant type 1 package ≥2.0mW/°C,
type 2 package ≥4.0mW/°C
• Time Constant of ≤15S to 70S |
Dimensions (mm)
| Code |
A |
B |
C |
D |
| D |
3 |
5 |
6 |
7 |
| L1 |
5 |
10 |
15 |
15 |
| L2 |
Customer
Specified |
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CWF1 (Ethoxyline dipped)
Characteristics: Moisture resistant,
good insulation, high reliability, small time constant,
quick responses.
Applications: Household air-conditioning,
refrigeration and many others.
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| Code |
A |
B |
C |
D |
E |
F |
G |
| D |
3 |
5 |
5 |
5 |
6 |
6 |
6 |
| L1 |
20 |
20 |
25 |
30 |
20 |
25 |
30 |
| L2 |
Customer
Specified |
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CWF2 (Packaged
in aluminum, copper, or stainless steel probe body)
Characteristics: High resistance
to thermal shock, moisture resistant, strong and secure
structure, high dissipation coefficient, the test
current can be higher than that of the ethoxyline
resin-package.
Applications: All kinds of refrigeration,
air-conditioning, water heaters, drinking fountains,
and more. |
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| Code |
A |
B |
C |
D |
| D |
3 |
3.5 |
4 |
5 |
| L1 |
10 |
15 |
15 |
15 |
| L2 |
Customer
Specified |
| Code |
A |
B |
| D |
8 |
8 |
| L1 |
35 |
50 |
| L2 |
Customer
Specified |
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CWF3 (Plastic
body)
Characteristics: Good dimensional
tolerances, good heat resistance and moisture protection,
high voltage resistance.
Applications: All kinds of Air-conditioning,
refrigeration, and more.
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CWF4 (Sheet
metal attachment fixtures)
Characteristics: Wide variety of
fixtures, suitable for most applications.
Applications: Fan control, industrial
temperature controllers, and more.
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CWF5 (Special
probes)
Characteristics: Small time constant,
fast response, flexible and secure.
Applications: Water heaters, electronic
thermometers, and more.
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Specification
(1)
NTC Temp sensor
(2) Package Option
1- Dipped ethoxyline resin (ex.
1A)
2- Aluminum,copper, or stainless
steel housing (ex. 2B)
3- Plastic body (ex. 3AA)
4- Sheet metal attachment fixtures
(ex. 4B)
5- Special probes (ex. 5B)
(3) The Rated Resistance at 25ºC
Example:103=10x103=10000Ω=10KΩ
(4) The Precision Symbol of Rated
Resistance
F: ±1% G:±2%
H:±3% J:±5%
(5) B value (25/50ºC) B value example:
3380K
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Technical Specifications
| Part
No. |
Rated
Resistance R25 |
B
Value
(25/50°C) |
Dissi.Coef.
(mW/°C) |
Themal
time Constant (S) |
Operating
Temp.
(°C) |
| Range
(KΩ) |
Allowable
Tolerance
(%) |
(K) |
Allowable
Tolerance
(%) |
| CWF3100
CWF3270
CWF3380
CWF3470
CWF3600
CWF3950
CWF4000
CWF4050
CWF4150
CWF4300
CWF4500 |
0.1-20
0.2-20
0.5-50
0.5-50
1-100
5-100
5-100
5°-200
10-250
20-1000
20-1000 |
+/- 1
+/-
2
+/-
3
+/-
4 |
3100
3270
3380
3470
3600
3950
4000
4050
4150
4300
4500 |
+/-
1
+/- 2 |
To type 1 package ≥ 2.0
To type 2 package ≥ 4.0
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To type 1 package ≤ 15
To type 2 package ≤ 70
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-55
to +125 |
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Canadian Thermostats & Control Devices Ltd.