Tags: thermocouple

Thermistors, Thermocouples, and RTDs: Which Sensor is Best for You?

Thermistors, Thermocouples, and RTDs: Which Sensor is Best for You?

MEI 18/12/2024 0
Thermistors, Thermocouples, and RTDs: Which Sensor is Best for You?When it comes to temperature measurement, selecting the right sensor is critical for obtaining accurate, reliable data. As a data logger manufacturer, we understand that choosing the appropriate sensor for your application can directly impact the success of your temperature monitoring. Here, we’ll explore the key differences between thermistors, thermocouples, and resistance temperature detectors (RTDs), helping you choose the right data logger for your needs.Thermistors What is a Thermistor? A thermistor is a temperature-sensitive resistor that exhibits a significant change in resistance with temperature changes. Typically made from ceramic or polymer materials, thermistors are highly sensitive and accurate within a limited temperature range.Advantages:• High Sensitivity: Thermistors provide precise readings within their operational range.• Cost-Effective: They are affordable and easy to integrate into various systems.• Compact Size: Their small form factor allows for use in tight spaces. Limitations:• Limited Temperature Range: Generally, thermistors are effective within -50°C to 150°C.• Non-linear Response: The r...
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Basic Knowledge of Thermocouple

Basic Knowledge of Thermocouple

MEI 07/02/2018 0
What is thermocouple?A thermocouple is a junction between two different metals that produces a voltage related to a temperature difference. When two wires composed of dissimilar metals are joined at both ends and one of the ends is heated, there is a continuous current which flows in the thermoelectric circuit (the thermoelectric effect or Seebeck effect).Need for reference junction( cold junction):In thermocouples, voltage is developed due to flow of electric current. This current flow depends upon the difference in temperatures at the two ends of conducting wire. That is thermocouples always measure difference in temperatures and not absolute temperature.To measure the temperature of one junction, the other junction is kept at some reference temperature. As this is done by using ice bath, it is normally called at cold junction.Using ice bath for constant temperature is useful for laboratory calibration, but is not convenient for most measurement and control applications. Instead of ice bath, an effect of  cold junction is   added using a thermally sensitive device such as a thermistor or diode. This is also called as isothermal block. Special care is taken to minimize any tempera...
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