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 this principle, where the current exceeds the specified value for a period of time, causing the fusible element to melt due to the heat generated by itself, thereby disconnecting the circuit. Fuses are widely used in high and low voltage distribution systems, control systems, and electrical equipment as protectors against short circuits and overcurrent, making them one of the most commonly used protective devices. A metal conductor is used 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 breaking the circuit. The fuse has a simple structure and is easy to use, 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 based on their transduction principles. 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. Commonly used condenser microphones use two types of energy sources: DC bias power supply and electret film. Both 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 produce a voltage signal proportional to the displacement of the sensitive membrane, while dynamic microphones produce a voltage signal proportional to the vibration rate of the sensitive membrane. Dynamic microphones use permanent magnets as an energy source, converting sound energy into electrical energy based on the inductive effect.

GEYER electrical component types

1. A rotary 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 rates of the two metals, the degree of curling of the bimetallic strip varies at different temperatures, causing the pointer to point to different positions on the dial. The temperature can be determined from the reading on the dial. 2. The resistance change of semiconductor thermometers differs from that of metals; as temperature increases, their resistance decreases, and the magnitude of change is significant. Therefore, even small temperature changes can cause noticeable changes in resistance, resulting in thermometers with high precision, often referred to as thermal sensors. 3. A thermocouple thermometer consists of two different metals connected to a sensitive voltmeter. At different temperatures, the metal junctions generate different potential differences at the 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 voltmeter reading. 4. Optical pyrometer: 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. This type of thermometer is called an optical pyrometer. It mainly consists of a telescope equipped with a red filter and a circuit with a small bulb, ammeter, and variable resistor. Before use, establish the relationship between the brightness of the filament corresponding to different temperatures and the readings on the ammeter. During use, align the telescope with the object to be measured, adjust the resistor until the brightness of the bulb matches that of the object, and then read the temperature of the object from the ammeter. 5. Liquid crystal thermometers made with different formulations 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 commonly used in ornamental fish tanks to indicate water temperature. 8. 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 humans and the surrounding environment, especially suitable for use in hospitals and homes.

GEYER electrical component classification

Thermosensitive materials are generally divided into three categories: semiconductor, metal, and alloy: 1. Semiconductor thermistor materials include single-crystal semiconductors, polycrystalline semiconductors, glass semiconductors, organic semiconductors, and metal oxides. They all have very large temperature coefficients of resistance and high resistivity, resulting in sensors with high sensitivity. Based on the temperature coefficient of resistance, they can also be divided into negative temperature coefficient materials and positive temperature coefficient materials. For example, barium titanate ceramic is an ideal positive temperature coefficient 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, the temperature measurement range is narrow, and uniformity is poor. 2. Metal thermistor materials are widely used as thermal resistors for temperature measurement, current limiters, and automatic constant-temperature heating elements. Examples include platinum resistance thermometers, nickel resistance thermometers, and copper resistance thermometers. Among them, platinum temperature sensors exhibit high precision and high stability in various media (including corrosive media). However, their widespread application is limited due to the scarcity and high cost of platinum. Copper temperature sensors are cheaper, but long-term use in corrosive media can lead to significant changes in static characteristics and resistance values. Nickel temperature sensors are widely used abroad and are considered an ideal material due to their high sensitivity, satisfactory reproducibility, and stability. 3. Alloy thermistor materials, also known as thermistor alloys, have higher resistivity and are sensitive to temperature changes in resistance, making them good materials for manufacturing temperature-sensitive sensors. The performance requirements for thermistor alloys as temperature-sensitive sensors are as follows: (1) sufficiently high resistivity; (2) relatively high temperature coefficient of resistance; (3) linear expansion coefficient close to that of the experimental material; (4) 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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