German ELSTEIN sensors ELSTEIN models ELSTEIN prices

ELSTEIN sensors are devices or assemblies that sense pressure signals and convert them into usable output electrical signals according to a defined pattern. Pressure sensors typically consist of a pressure-sensitive element and a signal processing unit. Depending on the type of pressure measured, pressure sensors can be classified as gauge pressure sensors, differential pressure sensors, and absolute pressure sensors. Pressure sensors are among the most commonly used sensors in industrial practice, widely applied in various industrial automation environments, including water conservancy and hydropower, railway transportation, smart buildings, production automation, aerospace, military industry, petrochemical, oil wells, electric power, ships, machine tools, pipelines, and many other industries.

ELSTEIN sensor working principle

Magnetic induction sensors are contact sensors; the figure shows their structural schematic. They consist of two alloy reeds with high magnetic permeability and low coercivity, sealed in a glass tube filled with inert gas. A certain overlap and appropriate gap are maintained between the two reeds, with gold-plated ends serving as contacts, and leads welded outside the tube. When the magnetic induction intensity at the sensor's location is sufficiently high, the two reeds attract each other, causing the contacts to conduct; when the magnetic field weakens to a certain extent, they release under the elastic force of the reeds themselves. When driven by permanent magnets, magnetic induction sensors are mostly used for detection, such as limit switches, replacing travel switches that rely on collision contact, thereby improving system reliability and service life. They are often used as communication signals for position control in PLC controllers.

ELSTEIN sensor precautions

The voltage used for DC magnetic induction sensors is generally 3~30V DC, and the typical application voltage range is generally 5~24V DC. Excessively high voltage causes internal component temperature rise, making the sensor unstable, while excessively low voltage makes it easy for external temperature changes to affect magnetic field strength characteristics, leading to circuit malfunction. When using Hall sensors to drive inductive loads, please connect freewheeling diodes in parallel across the load terminals; otherwise, transient high-voltage pulses during long-term operation of the inductive load will affect the service life of the Hall sensor. To ensure no accidents occur, please check whether the wiring is correct and verify that the voltage is the rated value before powering on.

ELSTEIN sensor applications

1) Motor industry: Brushless motors offer a series of advantages, including small size, light weight, high efficiency, convenient speed regulation, low maintenance, long service life, and no electromagnetic interference, with annual demand reaching hundreds of millions. In brushless motors, magnetic sensors serve as rotor pole position sensors and stator armature current commutators. Many magnetic sensors, such as Hall devices, Wiegand devices, and magnetoresistive devices, can be used, but Hall devices are the most widely used. Rotary encoders are used for motor speed detection and control. Optical encoders were previously common. Magnetic encoders are showing increasing advantages and are gradually replacing optical devices. Magnetic sensors can also be used for motor overload protection (mainly using Hall current sensors) and torque detection. 2) Power electronics technology: Power electronics technology combines power technology and electronic technology, enabling mutual conversion between AC and DC currents, and allowing free regulation of current, voltage, and frequency within required ranges. Using these technologies and products, various special power supplies (such as UPS, high-frequency power supplies, switching power supplies, arc welder inverter power supplies, etc.) and AC variable frequency drives (AC VFDs are used for motor speed control, offering excellent energy-saving effects) can be manufactured. The core of these conversion devices is high-power semiconductor devices. Various current sensors based on magnetic sensors are used to monitor, control, and protect these high-power devices. Hall current sensors feature fast response times and rely on magnetic field coupling with the controlled circuit without connecting to the main circuit, resulting in low power consumption, strong overload resistance, good linearity, and high reliability. They can serve as overcurrent protection drivers for high-power devices and as feedback devices, becoming a control link in automatic control loops. Conversion technology enables significant energy savings. Abroad, 95% of electrical energy is delivered through conversion. Although conversion technology has received considerable attention domestically, only 5% of electrical energy undergoes such conversion, indicating huge application potential. This area may absorb a large number of current sensors, representing another major industrial application field for magnetic sensors. 3) Energy management: Automatic grid monitoring systems need to collect large amounts of data. After computer processing, they monitor grid operating conditions and perform load distribution adjustment and safety protection. Each control link in the automatic monitoring system can be implemented using current sensors and transformers based on magnetic sensors. Hall current sensors are gradually being applied in grid systems. Electricity meters made with Hall devices are shifting from development to practical use; they can automatically bill and display power factor for timely adjustment, ensuring efficient power usage. 4) Machine technology and information read/write heads: In addition to magnetic tapes and disks, magnetic information recording devices include magnetic cards, magnetic ink record books, and magnetic records on banknotes, creating huge demand for magnetic information storage and readout sensors. Inductive heads, thin-film magnetoresistive heads, and amorphous heads are widely used. As recording density increases, for example to 100G bytes, heads with higher sensitivity and spatial resolution are required. Giant magnetoresistive heads based on multilayer metal films, amorphous alloy heads made from amorphous alloy wires, and giant magnetoimpedance heads are competing intensely. 5) Automotive industry: Cars use a large number of motors (advanced cars require about 40 to 60 motors per vehicle, and standard cars have 15 motors; these motors show a trend toward brushless designs). The extensive use of magnetic sensors in this context is self-evident. Another major application of magnetic sensors is in car ABS systems (Anti-lock Braking System), with an average of 4 to 6 speed sensors per vehicle, primarily inductive speed sensors. New types of Hall gear sensors, as well as Wiegand devices, amorphous devices, and magnetoresistive devices, are gradually being promoted and entering this field. Additionally, speed sensors and igniters for engine ignition timing mainly use inductive sensors. Hall gear sensors and Hall plate switches are already used in some car models. According to Honeywell, by June 6, 1996, they had supplied 8000 ten thousand Hall vane switches and 300 ten thousand Hall gear speed sensors to the automotive industry. It is predicted that future cars will adopt more than 30 magnetic sensors similar to Hall sensors. Furthermore, in fields such as industrial automatic control, robotics, office automation, home appliances, and various security systems, in addition to the widespread use of brushless DC motors and AC variable frequency drives, a large number of magnetic temperature controllers are used in devices such as refrigerators, air conditioners, and rice cookers. By the mid-80s, the number exceeded hundreds of millions.

Weidou Intelligent Technology specializes in selling German ELSTEIN sensors, ELSTEIN proximity sensors, ELSTEIN distance sensors, ELSTEIN vision sensors, ELSTEIN displacement sensors, ELSTEIN torque sensors, ELSTEIN speed sensors, ELSTEIN photoelectric sensors, ELSTEIN position sensors, ELSTEIN angle sensors, ELSTEIN tactile sensors, ELSTEIN temperature sensors, ELSTEIN pressure sensors, ELSTEIN flow sensors, ELSTEIN level sensors, ELSTEIN motion sensors, ELSTEIN process sensors, original German imports, welcome inquiries and orders from users.