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NTC Thermistors

NTC & PTC Thermistors

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.

CWF

Applications

• 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 Max 4 5 6 7
L1Max 16 16 16 16
L2 Customer Specified

> CWF1 (Ethoxyline dipped)
Characteristics: Moisture resistant, good insulation, high reliability, small time constant, quick responses.
Available Wire Types: AWG 24#, 26#, 28#,30#, PVC
Applications: Household air-conditioning, refrigeration and many others.

Code A B C D E F G
D
(±0.2 mm)
4 5 5 5 6 6 6
L1
(±0.2 mm)
20 20 25 30 20 25 30
L2 Customer Specified

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.

Standard Wire Type: AWG 24#, 26#, 28#,30#, PVC
Applications: Refrigeration, air-conditioning, water heaters, drinking fountains, and more.

3A Code A B C D
D
(±0.2 mm)
3.5 4 5 6
L1
(±0.2 mm)
15 15 15 20
L2 Customer Specified
3B Code A B C
D
(±0.2 mm)
4 8 8
L1
(±0.2 mm)
10 35 50
L2 Customer Specified

> CWF3 (Plastic body)

Characteristics: Good dimensional tolerances, good heat resistance and moisture protection, high voltage resistance.
Available Wire Types: AWG 24#, 26#, 28#,30#, PVC
Applications: Air-conditioning, refrigeration, and more.

> CWF4 (Sheet metal attachment fixtures)

Characteristics: Wide variety of fixtures, suitable for most applications.
Applications: Fan control, industrial temperature controllers, and more.

> CWF5 (Special probes)

Characteristics: Small time constant, fast response, flexible and secure.
Applications: Water heaters, electronic thermometers, and more.

* Also refer to the Cantherm Custom NTC Thermistor Probes.

Specification

Technical Specifications

Part No. Rated Resistance R25 B Value
(25/50ƒC)
Dissi.Coef.
(mW/ƒC)
Themal time Constant (S) Operating Temp.
(ƒC)
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 +/- 5 3100
3270
3380
3470
3600
3950
4000
4050
4150
4300
4500
+/- 1

+/- 2

≥ 2.2 ≤ 70 -55 to 125