HELIOSGROUP electrical components Germany HELIOSGROUP model HELIOSGROUP price

HELIOSGROUP electrical components are electrical control devices. When the change in the input quantity (excitation quantity) meets specified requirements, they cause a predetermined step change in the controlled quantity in the electrical output circuit. They have an interactive relationship between the control system (also known as the input circuit) and the controlled system (also known as the output circuit). Typically applied in automated control circuits, they are essentially "automatic switches" that use small currents to control the operation of large currents. Therefore, they play roles in automatic regulation, safety protection, and circuit switching in circuits. A relay is an electrical control device that, when given a specified input quantity for a sufficient duration, causes a predetermined step change in the controlled quantity in the electrical output circuit. When the input quantity drops to a certain level and remains there for a sufficient duration, it returns to its initial state.

HELIOSGROUP electrical component types

1. Rotating thermometers are made from a coiled bimetallic strip. One end of the bimetallic strip is fixed, and the other end is connected to a pointer. Because the two metal strips expand to different degrees, the degree of curling of the bimetallic strip varies at different temperatures, causing the pointer to indicate different positions on the dial. The temperature can be determined from the reading on the dial. 2. The resistance change in semiconductor thermometers differs from that in metals; as temperature increases, their resistance decreases, and the magnitude of change is relatively large. Therefore, even small temperature changes can cause significant changes in resistance, resulting in thermometers with high precision, often called thermal sensors. 3. Thermocouple thermometers consist of two different metals connected to a sensitive voltmeter. At different temperatures, the metal junctions produce different potential differences at the ends of the metals. Since the potential difference is very small, a sensitive voltmeter is required to measure it. The temperature can be determined from the voltmeter reading. 4. Optical pyrometers: When an object's temperature is high enough to emit a large amount of visible light, its temperature can be determined by measuring the amount of thermal radiation it emits; this type of thermometer is an optical pyrometer. This thermometer mainly consists of a telescope equipped with a red filter and a circuit containing a small lamp, a galvanometer, and a variable resistor. Before use, the relationship between the temperature corresponding to different filament brightness levels and the readings on the galvanometer is established. During use, align the telescope with the object to be measured and adjust the resistor until the brightness of the lamp matches that of the object. At this point, the temperature of the object can be read from the galvanometer. 5. Liquid crystal thermometers made with different formulations have different phase transition temperatures. When they undergo a phase transition, their optical properties change, causing the liquid crystal to appear to change color. If liquid crystals with different phase transition temperatures are coated on a sheet of paper, the temperature can be determined by the color change of the liquid crystal. The advantage of this thermometer is easy readability, while the disadvantage is insufficient accuracy. It is commonly used in ornamental fish tanks to indicate water temperature. 11. Digital thermometers use temperature sensors to convert (temperature) into digital signals, which are then displayed in numerical form on a display (such as LCD, seven-segment display, LED matrix, etc.). They can quickly and accurately measure the maximum human body temperature. Compared with traditional mercury thermometers, they offer advantages such as convenient digital reading, short measurement time, high measurement accuracy, memory function, and audible alerts. In particular, digital thermometers do not contain mercury, making them harmless to the human body and the surrounding environment, and thus particularly suitable for use in hospitals and homes.

HELIOSGROUP electrical component principles

NPN type bipolar transistors can be viewed as two diodes joined together with a common anode. In the normal operating state of a bipolar transistor, the base-emitter junction is forward-biased, while the base-collector junction is reverse-biased. Without external voltage, the electron concentration in the N region of the emitter junction is greater than that in the P region, so some electrons will diffuse into the P region. Similarly, some holes in the P region will diffuse into the N region. Thus, a space charge region forms at the emitter junction, generating an internal electric field directed from the N region to the P region. This field hinders further diffusion, achieving dynamic equilibrium. At this point, if a forward voltage is applied to the emitter junction, the dynamic balance between the carrier diffusion motion and the internal electric field in the depletion layer will be broken, causing thermally excited electrons to inject into the base region. In NPN type transistors, the base region is P type doped, where holes are the majority dopants, so electrons in this region are called "minority carriers." Electrons injected from the emitter into the base region partly recombine with the majority carrier holes there. On the other hand, because the base region has low doping levels, is physically thin, and the collector junction is reverse-biased, most electrons will reach the collector region via drift motion, forming the collector current. To minimize recombination of electrons before they reach the collector junction, the base region of the transistor must be made sufficiently thin so that the time required for carrier diffusion is shorter than the lifetime of semiconductor minority carriers, and the base thickness must be much smaller than the electron diffusion length. In modern bipolar transistors, the typical thickness of the base region is a few tenths of a micron. It should be noted that although both the collector and emitter are N type doped, their doping levels and physical properties are not identical. Therefore, a bipolar transistor must be distinguished from a configuration of two diodes connected in series in opposite directions.

HELIOSGROUP 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 quantity 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 quantity. Only when the change in the input quantity exceeds the resolution will the output change. Typically, the resolution at various points within the full-scale range of a sensor is not the same. Therefore, the maximum change in the input quantity within the full scale that causes a step change in the output is commonly used as the indicator for resolution. If the above indicator is expressed as a percentage of the full scale, it is called resolution. Resolution has a negative correlation with sensor stability.

Weidou Intelligent Technology professionally sells German HELIOSGROUP connectors, HELIOSGROUP switches, HELIOSGROUP relays, HELIOSGROUP controllers, HELIOSGROUP plugs, HELIOSGROUP sensors, HELIOSGROUP resistors, HELIOSGROUP capacitors, HELIOSGROUP buses, HELIOSGROUP modules, HELIOSGROUP cables, HELIOSGROUP power supplies, HELIOSGROUP interfaces, HELIOSGROUP gateways, HELIOSGROUP circuit breakers, HELIOSGROUP original imports from Germany. Customers are welcome to inquire and order.