Category Archives: Temperature

Temperature switch

A temperature switch is one detecting the temperature of an object. Temperature switches often use bimetallic strips as the temperature-sensing element, the motion of which actuates one or more switch contacts. An alternative design uses a metal bulb filled with a fluid that expands with temperature, causing the switch mechanism to actuate based on the pressure this fluid… Read More »

Concentrating Pyrometers

A time-honored design for non-contact pyrometers is to concentrate incident light from a heated object onto a small temperature-sensing element. A rise in temperature at the sensor reveals the intensity of the infrared optical energy falling upon it, which as discussed previously is a function of the target object’s temperature (absolute temperature to the fourth power):… Read More »


RTDs are completely passive sensing elements, requiring the application of an externally-sourced  electric current in order to function as temperature sensors. Thermocouples, however, generate their own electric potential. In some ways, this makes thermocouple systems simpler because the device receiving the thermocouple’s signal does not have to supply electric power to the thermocouple. The self-powering nature of thermocouples… Read More »

RTD (Resistance Temperature Detector) & Thermistors

RTD and Thermistors are simplest device in these devices resistance is increase when temperature is increase or decrease. when temp. is increase , resistance is increase  is call positive temp coefficient and vise versa. Thermistors are devices made of metal oxide which either increase in resistance with increasing  temperature.RTDs are devices made of pure metal… Read More »