Linear Thermistor Components, Probes, and Applications

Linear Thermistors

Description

Linear Response Components
For applications requiring thermistors with linear response to temperature change, OMEGA offers linear components. These unique devices consist of a thermistor composite for temperature sensing and an external resistor composite for linearizing.

Thermistor composites 44018 and 44019 each contain two thermistors packaged in a single sensor ( PDF Figures 1A & 1B). Thermistor composite 44020 contains three thermistors packaged in a single sensor (PDF Figure 1C).

Resistor composites for use with 44018 and 44019 thermistor composites consist of two metal film resistors of the size shown in Figure 2. Resistor composites for use with the 44020 thermistor composite consist of three of the same type metal film resistors.

Linear components are manufactured with different values for different temperatures ranges. When they are connected in networks shown in Figures 3 and 4, they produce a varying voltage or resistance which is linear with temperature.

One of the basic network manifestations is a voltage divider as in PDF Figure 3A for components other than #44212, and as shown in PDF Figure 3B for component #44212. The area within the dashed lines represents the thermistor composite. The network hookup for linear resistance versus temperature is shown in PDF Figure 4A for linear components except #44212, and in PDF Figure 4B for #44212.

Multiplexing
The 44018 thermistor composite is used in four of the linear components. The part that changes in each component is the resistor composite, which determines the temperature range. Therefore, the 44018 thermistor composite can be used over the entire -30 to 100°C temperature range by simply changing resistor composites. Its accuracy and interchangeability over the full range is ±0.15°C. It is not mandatory that OMEGA™ resistor composites be used with the 44018 thermistor composite. Any 0.1% resistors of the proper values and with a temperature coefficient of 30 PPM or less may be substituted. In other situations, it is frequently desirable to have thermistor composite temperature sensors at more than one location. When this is required, it is not necessary to have a separate resistor composite for each thermistor composite. It is possible to multiplex any number of thermistor composites through a single resistor composite for greater design flexibility.

PLEASE REVIEW pdf SPEC SHEET for complete product specifications and additional technical details.

	°C	°F	°C	°F
† Linear Components Kit Model No.	44201		44202
Range	0 to 100°C	32 to 212°F	-5 to 45°C	23 to 113°F
Thermistor Composite Model No.	44018		44018
Resistor Composite Model No.	44301		44302
Resistor Composite Values	R1 = 3200Ω R2 = 6250Ω		R1 = 5700Ω R2 = 12000Ω
Thermistor Accuracy & Interchangeability	±0.15°C -30 to 100°C	±0.27°F -22 to 212°F	±0.15°C -30 to 100°C	±0.27°F -22 to 212°F
E₀ Positive Slope	E_out= (+0.0053483 E_in) T +0.13493 E_in	E_out= (+0.00297127 E_in) T +0.03985 E_in	E_out= (+0.0056846 E_in) T +0.194142 E_in	E_out = (+0.00315851 E_in) T +0.093083 E_in
E₀ Negative Slope	E_out = (-0.0053483 E_in) T +0.86507 E_in	E_out = (-0.00297127 E_in) T +0.96015 E_in	E_out = (-0.0056846 E_in) T +0.805858 E_in	E_out = (-0.00315851 E_in) T +0.906917 E_in
Resistance Mode	R_t=(-17.115) T +2768.23	R_t= (-9.508) T +3072.48	R_t=(-32.402) T +4593.39	R_t = (-18,001) T +5169.42
*E_in MAX.	2.0 Volts		3.5 Volts 3.5 Volts
*IT MAX.	625 µA		615µA 615 µA
***Load Resistance Minimum R.L.	3 MΩ		10 MΩ 10 MΩ
Linearity Deviation	±0.216°C	±0.388°F	±0.065°C	±0.12°F

	°C	°F	°C	°F
† Linear Components Kit Model No.	44203		44204
Range	-30 to 50°C	-22 to 122°F	-2 to 38°C	+30 to 100°F
Thermistor Composite Model No.	44018		44018
Resistor Composite Model No.	44303		44304
Resistor Composite Values	R1 = 18,700Ω R2 = 35,250Ω		R1 = 5700Ω R2 = 12,400Ω
Thermistor Accuracy & Interchangeability	±0.15°C -30 to 100°C	±0.27°F -22 to +212°F	±0.15°C -2 to +38°C	±0.27°F -22 to +212°F
E₀ Positive Slope	E_out= 0.0067966 E_in) T +0.34893 E_in	Eo_out= (+0.00377588 E_in)T +0.228102 E_in	E_out= (+0.00563179 E_in) T +0.192439 E_in	E_out = (+0.0031289 E_in) T +0.09232 E_in
E₀ Negative Slope	E_out= 0.0067966 E_in) T +0.65107 E_in	E_out= (-0.00377588 E_in) T +0.771898 E_in	E_out= (-0.00563179 E_in) T +0.807563 E_in	E_out = (-0.0031289 E_in) T +0.90768 E_in
Resistance Mode	R_t = (-127.096) T +12175	R_t = (-70.608) T +14435	R_t = (-32.1012) T +4603.1	R_t = (-17,834) T +5173.8
*E_in MAX.	3.0 Volts		4 Volts
*IT MAX.	475 µA		685 µA
***Load Resistance Minimum R.L.	10 MΩ		10 MΩ
Linearity Deviation	±0.16°C	±0.29°F	±0.03°C	±0.055°F

	°C	°F	°C	°F
† Linear Components Kit Model No.	44211A		44212
Range	-55 to 85°C	-67 to 185°F	-50 to 50°C	-58 to 122°F
Thermistor Composite Model No.	44019		44020
Resistor Composite Model No.	44311A		44312
Resistor Composite Values	R1 = 3550Ω R2 = 6025Ω		R1 = 23,100Ω R2 = 88,200Ω R3 = 38,000Ω
Thermistor Accuracy & Interchangeability	±0.4°C, 0 to 85°C ±0.8°C, -55 to 0°C	±0.72, 32 to 185°F,br>±1.44, -67 to 32°F	±0.1°C -50 to 50°C	±0.18°F - 58 to 122°F
E₀ Positive Slope	E_out= (+0.005068 E_in) T +0.3411 E_in	E_out= (+0.002816 E_in) T +0.2510 E_in	E_out= (+0.00559149 E_in) T +0.40700 E_in	E_out = (+0.00310638 E_in) T +0.30760 E_in
E₀ Negative Slope	E_out= (-0.005068 E_in) T +0.6589 E_in	E_out= (-0.002816 E_in) T +0.7490 E_in	E_out= (-0.00559149 E_in) T +0.59300 E_in	E_out = (-0.00310638 E_in) T +0.69240 E_in
Resistance Mode	R_t = (-17.99) T +2339	R_t = (-9.994) T +2658.8	R_t = (-129.163) T +13698.23	R_t = (-71.757) T +15994.5
*E_in MAX.	2.0 Volts		3.5 Volts
*IT MAX.	833 µA		700 µA
***Load Resistance Minimum R.L.	10 MΩ		10 MΩ
Linearity Deviation	±1.1°C	±2°F	0.15°C (condition A) 0.08°C (condition B)	±0.27°F (A) ±0.15°F (B)

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Part Number/ Desc.

Qty

Description

Linear Kit Model Numbers

44201

AUD119.00

Availability: 1 week

Linear thermistor kit with 0 to 100°C (32 to 212°F) temperature range

44202

Consult Sales

Availability:

Linear thermistor kit with -5 to 45°C (23 to 113°F) temperature range

44203

Consult Sales

Availability:

Linear thermistor kit with -30 to 50°C (-22 to 122°F) temperature range

44204

AUD122.00

Availability: 1 week

Linear thermistor kit with -2 to 38°C (30 to 100°F) temperature range

44211A

Consult Sales

Availability:

Linear thermistor kit with -55 to 85°C (-67 to 185°F) temperature range

44212

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Availability:

Linear thermistor kit with -50 to 50°C (-58 to 122°F) temperature range

Thermistor Composite Model Numbers

44018

AUD106.00

Availability: 1 week

Thermistor Composite Temperature Range Dependent on Resistor Composite (See pdf Spec Sheet)

44019

Consult Sales

Availability:

Thermistor Composite with -55 to 85°C (-67 to 185°F) temperature range

44020

Consult Sales

Availability:

Thermistor Composite with -50 to 50°C (-58 to 122°F) temperature range

Resistor Composite Model Numbers

44301

Consult Sales

Availability:

Resistor Composite Model with 0 to 100°C (32 to 212°F) temperature range

44302

AUD41.50

Availability: 1 week

Resistor Composite Model with -5 to 45°C (23 to 113°F) temperature range

44303

AUD41.50

Availability: 13 weeks

Resistor Composite Model with -30 to 50°C ( -22 to 122°F) temperature range

44304

AUD53.00

Availability: 1 week

Resistor Composite Model with -2 to 38°C ( +30 to 100°F) temperature range

44311A

Consult Sales

Availability:

Resistor Composite Model with -55 to 85°C (-67 to 185°F) temperature range

44312

AUD64.00

Availability: 1 week

Resistor Composite Model with -50 to 50°C (-58 to 122°F) temperature range

† All amounts shown in AUD
Ordering Example: (1) 44204 Linear thermistor kit with -2 to 38°C (30 to 100°F) temperature range, AUD122.00