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About Temperature Sensors
Temperature sensors are measurement devices that determine temperature by sensing some physical characteristic, such as electrical resistance, electromagnetic field (EMF), or thermal radiation. There are many different types of products. Examples include thermocouples, resistance temperature detectors (RTDs), thermistors and bimetal switches, temperature sensor kits, and temperature and liquid level sensor combination units. Temperature measurement range, accuracy and stability are the most important specifications to consider when selecting temperature sensors. Additional parameters include probe type, tip and termination style, and electrical output. Products with visual displays and audible alarms are commonly available.
Thermocouples are temperature sensors which consist of two wires, each made of a different metal. The wires are joined at one end to form a junction which is exposed to the medium under measurement. The other ends of the wires are terminated to form a reference junction. Thermocouple temperature sensors are divided into various types, and include devices made of Chromel and Constantan (Type E), iron and Constantan (Type J), Chromel and Alumel (Type K), and copper and Constantan (Type T). Chromel, Alumel and Constantan are registered trademarks of the Hoskin Manufacturing Company. Nobel metal thermocouples are also available from some temperature sensor suppliers.
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Part Numbers for Temperature Sensors
| Part # | Distributor | Manufacturer | Product Category | Description |
|---|---|---|---|---|
| MCP9801T-M/MS | Digi-Key | Microchip Technology | Sensors, Transducers | IC TEMP SNSR 12BIT 2WIRE 8-MSOP |
| ISL21400IU8Z | Digi-Key | Intersil | Sensors, Transducers | IC VREF PREC TEMP SLOPE 8-MSOP |
| ISL21400IU8Z-TK | Digi-Key | Intersil | Sensors, Transducers | IC VREF PREC TEMP SLOPE 8-MSOP |
| LM35DT/NOPB | Digi-Key | National Semiconductor | Sensors, Transducers | IC SENSOR PREC CENT TEMP TO-220 |
| WTA32-05+37 | Digi-Key | Onset Computer Corp | Sensors, Transducers | DATA LOGGER OPT STOWAWY TEMP 32K |
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