temperature sensors. Scheme, description

ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
Free library / Electrician

Sensors. temperature sensors. Encyclopedia of radio electronics and electrical engineering

Free technical library

Encyclopedia of radio electronics and electrical engineering / Electrician's Handbook

In modern industrial production, the most common are temperature measurement. Thus, at a medium-sized nuclear power plant there are about 1500 points where such a measurement is made, and at a large chemical industry enterprise there are more than 20 thousand such points.

A wide range of measured temperatures, a variety of conditions for the use of measuring instruments and requirements for them determine the variety of temperature measuring instruments used.

If we consider temperature sensors for industrial applications, we can distinguish them main classes:

silicon temperature sensors;
bimetallic sensors;
liquid and gas thermometers;
thermal indicators;
thermistors;
thermocouples;
resistance thermal converters;
infrared sensors.

silicon sensors temperatures use the dependence of the resistance of semiconductor silicon on temperature. Range of measured temperatures -50 °С... +150 °С. They are mainly used to measure the temperature inside electronic devices.

Bimetal sensor made of two dissimilar metal plates fastened together. Different metals have different thermal expansion coefficients. If the metals connected to the plate are heated or cooled, then it will bend, while closing (opening) the electrical contacts or moving the indicator arrow. Range of work of bimetallic sensors -40...+550 °C. Used to measure the surface of solids and the temperature of liquids. The main areas of application are the automotive industry, heating and water heating systems.

Thermal indicators - These are special substances that change their color under the influence of temperature. The color change may be reversible or irreversible. They are produced in the form of films.

Author: Koryakin-Chernyak S.L.

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The manufacturer calls the device "the most powerful laptop in the universe." In top configurations, it is allowed to install an Intel Core i7-4960X Extreme Edition processor (six cores, a clock frequency of 3,6-4,0 GHz) or a Xeon E5-2697 v2 server chip (twelve cores, a clock frequency of 2,7-3,5, 3 GHz). The amount of RAM DDR1600L-32 reaches XNUMX GB.

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