Description

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.

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: Linear Thermistor Components are manufactured under U.S. Patent #3316765 and Canadian Patent #782790.

°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 |

E_{0} 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} |

E_{0} 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 |

E_{0} 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} |

E_{0} 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 |

E_{0} 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} |

E_{0} 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) |

† *All amounts shown in EUR*