Thermistors are types of semiconductors whose resistance changes according to any changes in temperature in the system to which the thermistor is connected. They are typically composed of ceramic or polymer materials which tend to be more sensitive to changes in temperature, with the amount of resistance in a thermistor being increased or decreased according to an increase in temperature.
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Thermo Sensors CorporationGarland, TX 800-889-5478 Thermo Sensors Corporation is dedicated to a quality control program that sets us apart in the industry. You can always look to TS Corp for a great product- such as our excellent thermistors. Thermo Sensors can also provide technical design assistance specific to your application. Give us a call and one of our experienced and knowledgeable staff members will provide you with solutions.
Thermal DevicesMt. Airy, MD 800-282-9100 Thermal Devices extensive line of products include precision made and tested thermistors and a variety of other temperature regulating equipment. The good people at Thermal Devises make it their number one priority to deliver you the assistance you need, the customer service you deserve and the competitive prices you can afford. Call them now! You won't regret it!
Temperature Specialists, Inc.St. Francis, MN 800-272-5709 Temperature Specialists, Incorporated designs and manufactures their sensing equipment to your specifications. Their full staff of knowledgeable professionals is determined to deliver quality resolutions and is eager to be your partner in all of your sensing considerations. Call them for all of your thermistor needs and find out what it means to be a satisfied customer.
Thermal CorporationMadison, AL 800-633-2962 Thermal Corporation has over thirty years of experience manufacturing and designing quality thermocouples at competitive prices. We offer Type J thermocouples and thermistors that are always available for quick manufacturing and shipment. Each thermocouple is manufactured to your exact specifications whenever you need it. Visit our website to learn more about our products and services.
United Electric Controls Co.Watertown, MA 617-926-1000 UE, est. 1931, is the leader in pressure & temperature Threshold Detection and Switching™ technology for rugged, industrial environments. Design & engineering expertise ensures the right product each time. Extensive line of standard thermocouples, RTDs, thermistors & temperature sensitive ICs. Custom packages are routine too. ISO 9001:2000 certified with a continued emphasis on quality & service.
ARi Industries, Inc.Addison, IL 800-237-6725 Founded in 1952, ARi Industries is a premier supplier of high-quality thermocouple assemblies, custom thermocouples, temperature sensors and temperature controllers. We supply all our standard AerOpak® thermocouple cables with high-purity MgO insulation. To benefit our customers we are constantly exploring new technologies for heater thermodynamics and fabrication techniques.
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Because of their dependence on resistance and temperature, thermistors can be used as temperature sensors or heat sensors. Out of all of the types of temperature sensors, thermistors are the most sensitive and so are used in precision applications which rely on system adjustments based on even slight temperature changes. Industries such as automotive, residential heating and electronics, medical, pharmaceutical and food and beverage processing use thermistors because of their ability to read and adjust to even slight changes in temperature. While they have a higher accuracy than other types of thermocouples such as resistance temperature detectors and high temperature thermocouples, thermistors do have a limited working temperature range due to the sensitive nature of the materials typically used to construct them. Manufacturers are able to design thermistors according to the specific needs of a temperature control system and can adjust the required resistance of the thermistor itself.
Modern thermostats and incubation systems, automotive applications such as monitoring the temperature of engine coolant or oil, as well as basic residential processes like electrical circuit protection all employ a type of thermistor to monitor and control the system. There are two main types of thermistors which are chosen depending on their intended applications. The first type thermistors are called a positive temperature coefficient thermistor (PTC). In PTC thermistors, if the first-order temperature coefficient of resistance is positive, the resistance will increase when the temperature increases. This is seen in current limiting devices such as those used for circuit protection in place of fuses. The increase in resistance of the thermistor due to a rise in temperature results in lowering the voltage traveling to a device. In the second type of thermistors, called negative temperature coefficient (NTC) thermistors, resistance decreases as temperature increases. This occurs when the first-order temperature coefficient of resistance is negative. These types of thermistors can be used in a wide range of applications. PTC thermistors can take the place of fuses in current-limiting devices for circuit protection, while NTC thermistors can be used as resistance thermometers. The temperature of battery packs and digital thermostats can be observed with either type of thermistor.
