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 |