ELPLASTHK electrical components Germany ELPLASTHK model ELPLASTHK price

ELPLASTHK electrical components are sensor resistors whose resistance changes with temperature. Based on different temperature coefficients, they are classified into positive temperature coefficient (PTC) thermistors and negative temperature coefficient (NTC) thermistors. The resistance of PTC thermistors increases as temperature rises, while the resistance of NTC thermistors decreases as temperature rises; both belong to semiconductor devices.

ELPLASTHK electrical component characteristics

The main parameters characterizing resistor properties include nominal resistance and its tolerance, rated power, load characteristics, and temperature coefficient of resistance. Load characteristics: When the ambient operating temperature is below tR, the resistor must not exceed its rated power; when it exceeds tR, the load power must be derated. Each type of resistor has specified load characteristics. Additionally, allowable load is correspondingly reduced under low atmospheric pressure. Under pulse load conditions, the average pulse power is far lower than the rated power, and separate specifications generally apply. Within the specified ambient temperature range, the average relative change in resistance per 11 °C change in temperature is expressed in ppm/°C. In addition to the above parameters, other technical indicators include nonlinearity (degree of deviation of the current-voltage characteristic from a linear relationship), voltage coefficient (relative rate of change in resistance per volt change in applied voltage), current noise (ratio of the RMS value of the noise potential generated by current flow within the resistor body to the test voltage, expressed as the current noise index), high-frequency characteristics (curve showing the decrease in resistance with increasing operating frequency due to distributed capacitance and inductance within the resistor body), and long-term stability (process of irreversible change in resistance due to environmental conditions during long-term use or storage).

ELPLASTHK electrical component principle

Based on different application purposes, various types of thermometers have been designed and manufactured. The design principles include: the phenomenon of thermal expansion and contraction of solids, liquids, and gases under temperature influence; the change in pressure of gas (or vapor) at constant volume due to temperature differences; the thermoelectric effect; the variation of electrical resistance with temperature; and the influence of thermal radiation. 1. Gas thermometer: Hydrogen or helium is often used as the temperature-sensing medium because their liquefaction temperatures are very low, close to absolute zero, resulting in a wide measurement range. This type of thermometer offers high accuracy and is commonly used for precision measurements. 2. Resistance thermometer: Divided into metal resistance thermometers and semiconductor resistance thermometers, both are made based on the characteristic that electrical resistance changes with temperature. Metal thermometers mainly use pure metals such as platinum, gold, copper, and nickel, as well as rhodium-iron and phosphor bronze alloys; semiconductor thermometers primarily use carbon, germanium, etc. Resistance thermometers are convenient and reliable, and have been widely applied. 3. Thermocouple thermometer: A temperature-measuring instrument widely used in industry. It is made using the thermoelectric effect. Two different metal wires are welded together to form the measuring junction, while the other ends are connected to a measuring instrument to form a circuit. When the measuring junction is placed at the temperature to be measured, a difference in temperature between the measuring junction and the free end generates an electromotive force, causing current to flow through the loop. By measuring electrical quantities and knowing the temperature at one point, the temperature at another point can be determined. It is suitable for applications involving large temperature differences between two substances and is often used for high-temperature and low-temperature measurements. 4. Dial thermometer: A thermometer shaped like an instrument panel, also known as a room thermometer, used to measure ambient temperature. It is made based on the principle of thermal expansion and contraction of metals. It uses a bimetallic strip as the temperature-sensing element to control the pointer. The bimetallic strip is typically made by riveting a copper strip and an iron strip together, with the copper strip on the left and the iron strip on the right. Since copper exhibits significantly greater thermal expansion and contraction than iron, when the temperature rises, the copper strip pulls the iron strip to bend to the right, causing the pointer to deflect to the right (indicating high temperature); conversely, when the temperature drops, the pointer deflects to the left under the drive of the bimetallic strip. 5. Glass tube thermometer: Glass tube thermometers measure temperature based on the principle of thermal expansion and contraction. Due to differences in the expansion coefficients, boiling points, and freezing points of the sensing media, common glass tube thermometers mainly include kerosene thermometers, mercury thermometers, and red ink thermometers. Their advantages are simple structure, ease of use, relatively high measurement accuracy, and low cost. The disadvantages are that the measurement range and accuracy are limited by the quality of the glass and the properties of the sensing medium. Additionally, they cannot transmit signals over long distances and are fragile. 6. Pressure thermometer: Pressure thermometers use the volume expansion or pressure change of liquid, gas, or saturated vapor in a sealed container upon heating as the measurement signal. Its basic structure consists of three parts: a temperature bulb, a capillary tube, and an indicator gauge. The advantages of pressure thermometers are simple structure, high mechanical strength, and resistance to vibration. They are low-cost and do not require external power. The disadvantages are limited temperature measurement range, significant heat loss, and slow response time. 11. Mercury thermometer is a type of expansion thermometer and can only be used as a local monitoring instrument. Using it to measure temperature is not only simple and intuitive but also helps avoid errors associated with remote transmission thermometers.

ELPLASTHK electrical component principle

Hall voltage changes with magnetic field strength; the stronger the magnetic field, the higher the voltage, and the weaker the magnetic field, the lower the voltage. The Hall voltage value is very small, typically only a few millivolts, but after amplification by an amplifier in an integrated circuit, the voltage can be amplified enough to output a stronger signal. To make the Hall integrated circuit function as a sensor, mechanical methods are needed to change the magnetic field strength. A rotating impeller is used as a switch to control magnetic flux. When the impeller blades are in the air gap between the magnet and the Hall integrated circuit, the magnetic field deviates from the integrated chip, and the Hall voltage disappears. Thus, changes in the output voltage of the Hall integrated circuit can indicate a specific position of the impeller drive shaft. Using this working principle, the Hall integrated circuit chip can be used as an ignition timing sensor. Hall effect sensors belong to passive sensors; they require an external power supply to operate, which allows them to detect low-speed operation conditions.

Weidou Intelligent Technology specializes in selling German ELPLASTHK connectors, ELPLASTHK switches, ELPLASTHK relays, ELPLASTHK controllers, ELPLASTHK plugs, ELPLASTHK sensors, ELPLASTHK resistors, ELPLASTHK capacitors, ELPLASTHK buses, ELPLASTHK modules, ELPLASTHK cables, ELPLASTHK power supplies, ELPLASTHK interfaces, ELPLASTHK gateways, ELPLASTHK circuit breakers, ELPLASTHK original imports from Germany. Welcome customers to inquire and order.