GEYER electrical components Germany GEYER model GEYER price

GEYER electrical components refer to an electrical device that disconnects the circuit by melting the fusible element with the heat generated by itself when the current exceeds the specified value. A fuse is a current protection device made based on the principle that after the current exceeds the specified value for a period of time, the heat generated by itself melts the fusible element, thereby disconnecting the circuit. Fuses are widely used in high and low voltage distribution systems, control systems, and electrical equipment as short-circuit and overcurrent protectors, and are one of the most commonly used protective devices. Using a metal conductor as the fusible element connected in series in the circuit, when overload or short-circuit current passes through the fusible element, it melts due to its own heating, thereby disconnecting the circuit. The fuse has a simple structure and is easy to use, and is widely used in power systems, various electrical equipment, and household appliances as a protective device.

GEYER electrical component classification

Microphones can be divided into dynamic microphones and condenser microphones according to their transduction principles. Among them, dynamic types can be further subdivided into moving-coil microphones and ribbon microphones. Common commercial microphone types include condenser microphones, crystal microphones, carbon microphones, and dynamic microphones. The energy sources used by common condenser microphones are two types: DC bias power supply and electret film. Both of these condenser microphones and crystal microphones convert sound energy into electrical energy, generating a changing electric field. Carbon microphones use a DC voltage source, changing their resistance through sound vibration, thereby converting sound signals into electrical signals. Condenser, crystal, and carbon microphones all generate a voltage signal proportional to the displacement of the sensitive membrane, while dynamic microphones generate a voltage signal proportional to the vibration velocity of the sensitive membrane. Dynamic microphones use permanent magnets as the energy source, converting sound energy into electrical energy based on the inductive effect.

GEYER electrical component types

1. A rotating thermometer is made of a coiled bimetallic strip. One end of the bimetallic strip is fixed, and the other end is connected to a pointer. Due to different expansion degrees of the two metal strips, the coiling degree of the bimetallic strip varies at different temperatures, causing the pointer to point to different positions on the dial. The temperature can be known from the reading on the dial. 2. The resistance change of semiconductor thermometers is different from that of metals; when the temperature rises, their resistance decreases, and the magnitude of change is large. Therefore, even a small temperature change can cause a significant change in resistance, resulting in thermometers with high precision, often called thermal sensors. 3. A thermocouple thermometer consists of two different metals connected to a sensitive voltmeter. At different temperatures, the metal junctions produce different potential differences at the two ends of the metals. The potential difference is very small, so a sensitive voltmeter is required to measure it. The temperature can be determined from the reading of the voltmeter. 4. Optical pyrometer: When the temperature of an object is high enough to emit a large amount of visible light, its temperature can be determined by measuring the amount of its thermal radiation; this type of thermometer is an optical pyrometer. This thermometer is mainly composed of a telescope equipped with a red filter and a circuit with a small bulb, galvanometer, and variable resistor. Before use, establish the relationship between the temperature corresponding to different brightness levels of the filament and the readings on the galvanometer. During use, align the telescope with the object to be measured, adjust the resistance so that the brightness of the bulb matches that of the object, and then the temperature of the object can be read from the galvanometer. 5. Liquid crystal thermometers made with different formulas have different phase transition temperatures. When they undergo 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 piece of paper, the temperature can be determined by the color change of the liquid crystal. The advantage of this thermometer is easy reading, but the disadvantage is insufficient accuracy. It is often used in ornamental fish tanks to indicate water temperature. 8. A digital thermometer uses a temperature sensor to convert (temperature) into a digital signal, and then displays the temperature in digital form through a display (such as LCD, digital tube, LED matrix, etc.). It can quickly and accurately measure the maximum value of human body temperature. Compared with traditional mercury thermometers, it has the advantages of convenient digital reading, short measurement time, high measurement accuracy, memory function, and audible alert. In particular, digital thermometers do not contain mercury, are harmless to the human body and the surrounding environment, and are especially suitable for use in hospitals and homes.

GEYER electrical component classification

Thermosensitive materials are generally classified into three categories: semiconductor, metal, and alloy types: 1. Semiconductor thermistor materials include single-crystal semiconductors, polycrystalline semiconductors, glass semiconductors, organic semiconductors, and metal oxides. They all exhibit very large temperature coefficients of resistance and high resistivity, resulting in sensors with considerable sensitivity. Based on the temperature coefficient of resistance, they can also be divided into negative temperature coefficient (NTC) materials and positive temperature coefficient (PTC) materials. For example, barium titanate ceramic is an ideal PTC semiconductor material. Both types of materials are widely used in temperature measurement, temperature control, temperature compensation, switching circuits, overload protection, and time delay applications, such as in the manufacture of thermistor thermometers, thermistor switches, and thermistor delay relays. Due to the exponential relationship between resistance and temperature, these materials have a narrow temperature measurement range and poor uniformity. 2. Metal thermistor materials are widely used as resistance temperature detectors, current limiters, and automatic constant-temperature heating elements. Examples include platinum resistance thermometers, nickel resistance thermometers, and copper resistance thermometers. Among these, platinum temperature sensors demonstrate significant high precision and high stability characteristics in various media, including corrosive environments. However, their widespread application is somewhat limited by the scarcity and high cost of platinum. Copper temperature sensors are less expensive, but long-term use in corrosive media can lead to significant changes in static characteristics and resistance values. Nickel temperature sensors are extensively used abroad and are considered a relatively ideal material due to their high sensitivity, satisfactory reproducibility, and stability. 3. Alloy thermistor materials, also known as thermistor alloys, have relatively high resistivity and exhibit sensitive resistance changes with temperature, making them suitable for manufacturing temperature-sensitive sensors. The performance requirements for thermistor alloys used as temperature-sensitive sensors are as follows: (1) sufficiently high resistivity; (2) a relatively high temperature coefficient of resistance; (3) a linear expansion coefficient close to that of the experimental material; (4) a low strain sensitivity coefficient; (14) good repeatability of the resistance-temperature curve during heating and cooling within the operating temperature range.

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