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gt elektrotech electrical components are commonly used temperature-sensing elements in temperature measurement instruments. They directly measure temperature and convert the temperature signal into a thermoelectric EMF signal, which is then converted into the temperature of the measured medium by an electrical instrument (secondary instrument). The external shapes of various thermocouples often differ significantly depending on requirements, but their basic structures are largely similar, typically consisting of main parts such as hot electrodes, insulating sleeve protection tubes, and terminal blocks. They are usually used in conjunction with display instruments, recording instruments, and electronic regulators. In industrial production processes, temperature is one of the important parameters that need to be measured and controlled. In temperature measurement, thermocouples are widely used due to many advantages such as simple structure, ease of manufacturing, wide measurement range, high accuracy, low inertia, and output signals suitable for long-distance transmission. In addition, since a thermocouple is a passive sensor that does not require an external power supply during measurement, it is very convenient to use and is often used to measure the temperature of gases or liquids inside furnaces and pipelines, as well as the surface temperature of solids.

gt elektrotech electrical component applications

Light-emitting diodes are widely used in many fields. The following outlines their main applications: (1) Applications in electronic products: Light-emitting diodes are generally used as backlight sources for screens or for display and lighting purposes in electronic products. From large LCD TVs and computer monitors to media players MP3, MP4, and mobile phones, light-emitting diodes are used as screen backlights. (2) Applications in automobiles and heavy machinery: Light-emitting diodes are widely used in automobiles and heavy machinery. Turn signals, interior lighting, instrument panel lighting, headlights, indicator lights, brake lights, and tail lights in automobiles and heavy mechanical equipment all utilize light-emitting diodes. This is mainly because light-emitting diodes have fast response times and long service lives (generally, the lifespan of a light-emitting diode exceeds that of the automobile or heavy machinery itself). (3) Applications in coal mines: Due to characteristics such as high efficiency, low energy consumption, long lifespan, and high luminous intensity compared to ordinary light-emitting devices, light-emitting diodes are used in miner's lamps and underground lighting equipment. Although not yet fully popularized, they will soon see widespread application, and light-emitting diodes will replace ordinary light-emitting devices in coal mine applications. (6) Urban decorative lighting: In today's bustling commercial era, neon lights are an important symbol of urban prosperity, but they have many disadvantages, such as insufficient lifespan. Therefore, replacing neon lights with light-emitting diodes offers many advantages. Compared to neon lights, light-emitting diodes not only have a longer lifespan but also feature energy savings, simple drive and control, and maintenance-free operation. The replacement of neon lights with light-emitting diodes is an inevitable result of the development of lighting equipment.

gt elektrotech electrical component characteristics

Resolution refers to the ability of a sensor to detect the smallest change in the measured quantity. That is, if the input changes slowly from a non-zero value, the sensor's output will not change when the input change does not exceed a certain value, meaning the sensor cannot resolve this change in the input. Only when the change in the input exceeds the resolution will the output change. Typically, the resolution at different points within the full-scale range of a sensor is not the same. Therefore, the maximum change in input within the full scale that causes a step change in the output is commonly used as the indicator for measuring resolution. If the above indicator is expressed as a percentage of the full scale, it is called resolution. Resolution has a negative correlation with the stability of the sensor.

gt elektrotech electrical component classification

Classification by material: a, wirewound resistors are formed by winding resistance wire. They are made by winding high-resistance alloy wire around an insulating skeleton, coated with a heat-resistant glaze insulating layer or insulating varnish. Wirewound resistors have a low temperature coefficient, high resistance accuracy, good stability, heat resistance, and corrosion resistance. They are mainly used as precision high-power resistors. The disadvantages are poor high-frequency performance and a large time constant. b, carbon composition resistors are made by pressing carbon and synthetic plastic together. c, carbon film resistors are made by depositing a layer of carbon on a ceramic tube, specifically by depositing crystalline carbon onto a ceramic rod skeleton. Carbon film resistors are low-cost, stable in performance, have a wide resistance range, and feature low temperature and voltage coefficients. They are currently the most widely used resistors. d, metal film resistors are made by depositing a layer of metal on a ceramic tube, using vacuum evaporation to deposit alloy material onto the surface of a ceramic rod skeleton. Metal film resistors offer higher accuracy, better stability, lower noise, and a smaller temperature coefficient than carbon film resistors. They are extensively used in instruments and communication equipment. e, metal oxide film resistors are made by depositing a layer of tin oxide on a ceramic tube, specifically by depositing a layer of metal oxide on an insulating rod. Since the material itself is an oxide, it is stable at high temperatures, resistant to thermal shock, and has strong load capacity. Classified by application, types include general-purpose, precision, high-frequency, high-voltage, high-resistance, high-power, and resistor networks.

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