Automated temperature monitoring and control ensure food safety

The basics don’t change much “’Sensing elements themselves are pretty stable in that they don’t tend to change,’ says Paul Gobeille, Stellar senior automation engineer. “For example, you’ll find that the theories behind thermocouples (T/Cs), RTDs (resistance temperature detectors), thermistors and infrared (IR) sensors presented in various sources are virtually the same as when they…

Mechanical Temperature Measuring Sensors

Mechanical (liquid-in-glass thermometers, bimetallic strips, bulb & capillary, pressure type etc.) Thermojunctive (thermocouples) Thermoresistive (RTDs and thermistors) Radiative (infrared and optical pyrometers) Mechanical Temperature Measuring devices Principle of Operation A change in temperature causes some kind of mechanical motion, typically due to the fact that most materials expand with a rise in temperature. Mechanical thermometers can be…

Components of RTD

Resistance Temperature Detector (RTD) is a temperature sensor which measures temperature using the principle that the resistance of a metal changes with temperature. In practice, an electrical current is transmitted through a piece of metal (the RTD element or resistor) located in proximity to the area where temperature is to be measured. The resistance value of…

Resistance Temperature Detectors (RTD) Construction

This particular design has a platinum element that is surrounded by a porcelain insulator. The insulator prevents a short circuit between the wire and the metal sheath. Inconel, a nickel-iron-chromium alloy, is normally used in manufacturing the RTD sheath because of its inherent corrosion resistance. When placed in a liquid or gas medium, the Inconel sheath quickly…

Types of Thermocouples with Temperature Ranges & Color Codes

Types of Thermocouples with Temperature Ranges & Color Codes Thermocouple can be defined as a sensor or device which is used for sensing or measuring temperature. The thermocouples are consisting of two metals or wires and the metals are known as legs. Both legs are welded together so as to create two junctions. Temperature is measured in these junctions…