German MUHLE MESSZEUGE sensors, MUHLE MESSZEUGE models, MUHLE MESSZEUGE prices

MUHLE MESSZEUGE sensors are sensors that can sense temperature and convert it into usable output signals. Temperature sensors are the core component of temperature measuring instruments and come in a wide variety. They can be divided into two major categories based on measurement method: contact and non-contact. Based on sensor materials and electronic component characteristics, they are classified into two types: resistance thermometers and thermocouples.

MUHLE MESSZEUGE sensor working principle

Magnetic induction sensors are a type of contact sensor; 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 in PLC controllers as communication signals for position control.

MUHLE MESSZEUGE sensor precautions

The voltage used for DC magnetic induction sensors is generally 3~30V DC, with a typical application voltage range of 5~24V DC. Excessively high voltage causes internal component temperature rise, making the sensor unstable, while excessively low voltage makes the magnetic field strength characteristics susceptible to external temperature changes, 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 before powering on and verify that the voltage is the rated value.

MUHLE MESSZEUGE sensor applications

1) Electric Motor Industry: Brushless motors offer a series of advantages, including compact size, light weight, high efficiency, convenient speed regulation, low maintenance requirements, long service life, and no electromagnetic interference. The annual demand amounts to hundreds of millions. In brushless motors, magnetic sensors are used for rotor magnetic pole position sensing and stator armature current commutation. Many types of magnetic sensors, such as Hall devices, Wiegand devices, and magnetoresistive devices, can be used, but Hall devices are the most widely employed. Rotary encoders are used for motor speed detection and control; optical encoders were commonly used in the past. Magnetic encoders are showing increasing advantages and are gradually replacing optical components. Magnetic sensors can also be used for motor overload protection (primarily 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. By adopting these technologies and products, various special power supplies (such as UPS, high-frequency power supplies, switching power supplies, and inverter power supplies for arc welders) and AC variable frequency drives (VFDs) can be manufactured (AC VFDs are used for motor speed control and offer excellent energy-saving effects). 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 both as overcurrent protection drivers for high-power devices and as feedback components, becoming a control link in automatic control loops. The use of conversion technology can achieve significant energy savings; abroad, 95% of electrical energy is processed through conversion. Although conversion technology has received high attention domestically, only 5% of electrical energy undergoes this transformation, indicating huge application potential. This area, which may absorb a large number of current sensors, represents another major industrial application field for magnetic sensors. 3) Energy Management: Automatic grid monitoring systems need to collect large amounts of data, which, after computer processing, enables monitoring of grid operating conditions, 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 have shifted from development to practical application; they can automatically calculate billing and display power factor to allow timely adjustments, ensuring efficient electricity 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 sensors for magnetic information storage and readout. Inductive heads, thin-film magnetoresistive heads, and amorphous heads are extensively used. As recording density increases, for example to 100G bytes, heads with higher sensitivity and spatial resolution are required. Giant magnetoresistive (GMR) heads based on multilayer metal films, amorphous alloy heads made from amorphous alloy wires, and giant magnetoimpedance heads are competing intensely. 5) Automotive Industry: A large number of motors are used in automobiles (advanced cars require approximately 40 to 60 motors per vehicle, while standard cars have 15 motors, showing a trend toward brushless designs). The extensive use of magnetic sensors in these motors is self-evident. Another major application area for magnetic sensors is the automotive ABS system (Anti-lock Braking System), where each car uses an average of 4 to 6 speed sensors, primarily inductive speed sensors. New types of Hall gear sensors, which are gradually being promoted, along with Wiegand devices, amorphous devices, and magnetoresistive devices, are entering this field. Additionally, speed sensors and igniters for ignition timing in automobile engine systems mainly use inductive sensors. Hall gear sensors and Hall effect 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 in the future, more than 30 magnetic sensors similar to Hall sensors will be adopted in a single vehicle. 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 VFDs, a large number of magnetic temperature controllers are used in devices like refrigerators, air conditioners, and rice cookers. By the mid-80s, the quantity exceeded hundreds of millions.

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