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werit electrical components are a commonly used low-current master control device. They utilize the collision of moving parts of production machinery to actuate their contacts, thereby connecting or disconnecting the control circuit to achieve specific control objectives. Typically, such switches are used to limit the position or travel of mechanical motion, enabling the moving machinery to automatically stop, reverse, change speed, or perform automatic reciprocating motion at a specified position or travel. In electrical control systems, the role of position switches is to implement sequence control, positioning control, and detection of position status. They are used for controlling the travel of mechanical equipment and providing limit protection. Construction: Composed of an operating head, contact system, and housing. In actual production, limit switches are installed at predetermined positions. When a module mounted on the moving parts of the production machinery strikes the limit switch, the contacts of the limit switch actuate, achieving circuit switching. Therefore, a limit switch is an electrical device that switches circuits based on the travel position of moving parts, and its operating principle is similar to that of a pushbutton. Limit switches are widely used in various machine tools and lifting machinery to control their travel and provide terminal limit protection. In elevator control circuits, limit switches are also used to control the speed of opening and closing car doors, provide automatic door opening/closing limit protection, and provide upper and lower limit protection for the car.

werit electrical component classification

Thermosensitive materials are generally classified 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 possess very large resistance temperature coefficients and high resistivity, resulting in sensors made from them having relatively high sensitivity. Based on the resistance temperature coefficient, 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 semiconductor material with a positive temperature coefficient. 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 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 these, platinum temperature sensors exhibit significantly high precision and stability in various media (including corrosive media). However, their widespread application is somewhat 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 extensively used abroad and are considered a relatively ideal material because they offer high sensitivity, satisfactory reproducibility, and stability. 3. Alloy thermistor materials, also known as thermistor alloys. This type of alloy has relatively high resistivity, and its resistance value is sensitive to temperature changes, making it a good material 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 resistance temperature coefficient; (3) linear expansion coefficient close to that of the experimental material; (4) small strain sensitivity coefficient; (8) good repeatability of the resistance-temperature curve during heating and cooling within the operating temperature range.

werit electrical component principle

The absorption film irradiated by infrared rays is a thin film with low heat capacity, allowing its temperature to rise easily. A cavity structure is located directly below the center of the substrate, ensuring a temperature difference between the cold junction and the measuring junction. The thermocouple is composed of polysilicon and aluminum, connected in series. When the temperature at the measuring junction of each thermocouple rises, a thermoelectromotive force Vn is generated between the thermocouples, so the sum of their voltages can be obtained at the output terminal.

werit electrical component classification

Fiber optic connectors can be classified into common single-mode and multimode connectors for silica-based fibers based on the transmission medium, as well as other fiber optic connectors using plastic etc. as the transmission medium. Based on the connector structure, they can be divided into: FC, SC, ST, LC, D8, DIN, MU, MT, and various other forms. Among them, ST connectors are typically used at the cabling equipment end, such as fiber patch panels and fiber modules; while SC and MT connectors are typically used at the network equipment end. Based on the fiber end-face shape, they are classified into FC, PC (including SPC or UPC), and APC; based on the number of fiber cores, they are divided into single-core and multi-core (such as MT-RJ). Fiber optic connectors are widely used and come in many varieties. In practical applications, we generally distinguish them based on the different structures of the fiber optic connectors.

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