Thermistors

What are thermistors?

Thermistors are available in two types: Negative Temperature Coefficients (NTC thermistors) and Positive Temperature Coefficients (PTC thermistors). NTC thermistors’ resistance decreases as their temperature increases, while PTC thermistors’ resistance increases as their temperature increases. NTC’s are the most commonly used in temperature measurement.

Thermistor characteristics are defined based on the composition of materials with known resistance. As the temperature increases, an NTC thermistor’s resistance will increase in a non-linear fashion, following a particular “curve.” The shape of this resistance vs. temperature curve is determined by the properties of the materials that make up the thermistor.  Thermistors are accurate to approximately ± 0.2°C within their specified temperature range. They’re generally durable, long-lasting, and inexpensive. They are typically epoxy coated to provide the optimum performance in heavy duty environments. Thermistors and especially NTC’s are mainly applied in a temperature range from -50°C to +150°C with typical resistance values between 2,000Ω and 10,000Ω.

Common applications:
In Senmatic NTC thermistors are primarily used for low temperature application within the refrigerated cargo industry, also know as reefer containers. They are either used to measure and monitor the refrigeration unit or as a cargo temperature probe, commonly known as USDA probes.

 

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Below you can find all thermistors divided into groups

DIN-standardized RTD Marine classified Wire sensors All thermistors
DIN-standardized RTD
Temperature sensor type PTE

Type PTE - Wire sensor - straight thermometer

For mouting in immerrsion wells, in gases and Machinery e.g. bearings

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Marine classified
Temperature sensor type PTE

Type PTE - Wire sensor - straight thermometer

For mouting in immerrsion wells, in gases and Machinery e.g. bearings

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Wire sensors
Temperature sensor type PTE

Type PTE - Wire sensor - straight thermometer

For mouting in immerrsion wells, in gases and Machinery e.g. bearings

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Temperature sensor type PTI

Type PTI - insertion thermometer - Classified

For measurement of temperatures in e.g. meat and fruit

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Type USDA - For insertion in meat / vegetables

To monitor and control the temperature during transportation

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All thermistors
Temperature sensor type PTE

Type PTE - Wire sensor - straight thermometer

For mouting in immerrsion wells, in gases and Machinery e.g. bearings

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Temperature sensor type PTI

Type PTI - insertion thermometer - Classified

For measurement of temperatures in e.g. meat and fruit

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Temperature sensor type PTI

Type USDA - for insertion - refrigerated rooms

For monitoring of temperatures in e.g. meat and fruit during transportation

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