Electrical Resistance Temperature Indicator

Electrical Resistance Temperature Indicators (ERTIs) are instruments used for measuring and indicating temperature using the principle of electrical resistance. They are part of the supply class Pressure, Temperature, and Humidity Measuring and Controlling Instruments, which falls under the supply group Instruments and Laboratory Equipment.

ERTIs typically consist of a temperature sensor, such as a platinum resistance thermometer (PRT) or a thermistor, and a display unit. The temperature sensor is designed to have a known and predictable change in electrical resistance with temperature. This resistance change is then measured and converted into a temperature reading by the indicator.

ERTIs are commonly used in various industries and applications where accurate temperature measurement is crucial. They are often found in laboratories, manufacturing plants, HVAC systems, and other environments where temperature control is important.

Some key features of ERTIs may include:

1. Accuracy: ERTIs are designed to provide precise temperature measurements with high accuracy.
2. Range: They can measure a wide range of temperatures, depending on the specific model and sensor used.
3. Display: ERTIs typically have a digital display that shows the temperature reading in degrees Celsius or Fahrenheit.
4. Calibration: Some ERTIs may require periodic calibration to ensure accurate temperature measurements.
5. Output: Some models may have additional output options, such as analog outputs or digital communication interfaces, for data logging or integration with other systems.

Overall, Electrical Resistance Temperature Indicators are essential instruments for temperature measurement and control in various industries and laboratory settings.