German Comat sensors, Comat models, Comat prices

Comat sensors are devices that convert magnetic signals into electrical signals. By leveraging the transformation relationship between magnetic quantities and other physical quantities, using a magnetic field as the medium, they can also convert signals of other non-electrical physical quantities into electrical signals. There are two driving methods: one uses a permanent magnet, and the other uses an electromagnetic coil. The former is mostly used for detection; for example, if a moving part is made of a magnet, it will attract and emit a signal once it approaches the magnetic induction sensor. The latter is mostly used for control; if the electromagnetic coil is energized, the contacts will attract. Using magnetic induction sensors to replace limit switches that rely on collision contact can improve system reliability and service life; therefore, they are often used in programmable logic controllers as signaling devices for position arrival.

Comat sensor classification

1) Laser speed measurement: With the rise of modern precision manufacturing and the demand for cost savings, non-contact speed sensors are gradually replacing contact speed sensors. Currently, the most accurate and commonly used non-contact laser speed sensor on the market is the ZLS-Px aberration speed sensor. The aberration speed sensor has two ports: one emission port that emits LED light source; and one high-speed photography port that achieves CCD area high-speed imaging comparison. By comparing images at two points in time within an extremely short period, the distance the measured object moves is determined, and combined with the algorithm inside the sensor, the speed of the measured object is output in real time. As shown in the figure, (1) is the LED light emission port, (2) is the camera reception port, (3) and (4) are terminal blocks, and (5) are fixing screw holes. (1) The LED light emission port emits laser light toward the measured object, which reflects to the (2) camera reception port. After receiving the signal, it is transmitted to the signal processor, which calculates the speed via an algorithm. The ZLS-Px aberration speed sensor can simultaneously measure speed and length in two directions. It can not only detect whether the measured body has stopped but also detect its direction of motion. Fix the sensor on a stable bracket to ensure that the rotating object does not generate excessive vibration during rotation, thereby allowing measurement of the rotation angle and rotational speed of the rotating measured body. 2) Radar speed measurement: Traditional speed measurement mostly involves rotary motion speed measurement and linear motion speed measurement. However, there are many irregular speed measurements in industrial automation, such as athlete motion speed measurement, traffic vehicle speed measurement, and golf ball speed measurement. Radar speed sensors can meet these requirements.

Comat sensor principle

A transmissive speed sensor consists of a slotted or notched disk, a light source, and a phototube. When the disk rotates with the shaft under test, light can only reach the phototube through the holes or notches. When the phototube is illuminated, its reverse resistance is very low, thus outputting an electrical pulse signal. When the light source is blocked by the disk, the reverse resistance of the phototube is very high, and there is no signal output at the output terminal. In this way, based on the number of holes or notches on the disk, the rotational speed of the shaft under test can be measured. The number of holes or notches on the disk is usually set to sixty, so that for each revolution of the shaft under test, the photoelectric converter outputs 60 pulse signals. If the time base signal of the electronic counter is set to 1s, the rotational speed of the shaft under test can be read directly. The principle of a reflective speed sensor is the same as that of a transmissive one; it converts changes in received light into changes in electrical signals via a phototube, but it obtains pulse signals through light reflection, typically by adhering reflective material to the measurement area of the shaft under test to form a reflective surface. Commonly used reflective materials are special speed-measuring reflective paper tapes (adhesive tapes); aluminum foil or other reflective materials can also be used as substitutes; sometimes white paint can be applied to the measurement area to serve as a reflective surface. The emitter and the reflective surface must be properly configured, typically, the distance between them is 5-15M. When the measured shaft rotates, the photoelectric element receives pulsating light, and outputs corresponding electrical signals to the electronic counter, thereby measuring the rotational speed of the measured shaft. The waveform of the output signal from the photoelectric speed sensor is relatively regular, close to a standard square wave, with almost no interference signals generated. However, for transmissive types, vibration reduces the service life of the light source, so they are not suitable for use under conditions with strong vibration. Reflective types have no mechanical connection with the measured shaft, making them convenient to use.

Comat sensor industry applications

1) Modern vehicles are generally equipped with engine control, autonomous driving, ABS, TRC, automatic door locking, active suspension, guidance systems, electronic instruments, and other devices, all of which require vehicle speed signals. Therefore, the accuracy and stability of the output signal from the speed sensor measuring vehicle operation will greatly affect these control units. Automotive speed sensors mostly adopt a Hall-effect structure. A Hall speed sensor is a magneto-electric sensor based on the Hall effect, characterized by high sensitivity to magnetic fields, stable output signal, high frequency response, strong anti-electromagnetic interference capability, simple structure, and ease of use. It mainly consists of a permanent magnet with a specific number of magnetic pole pairs (generally 4 or 8 pairs), a Hall element, a rotating mechanism, and input/output connectors. Its working principle is that when the sensor's rotating mechanism rotates under external drive, it drives the permanent magnet to rotate, causing periodic changes in the magnetic field passing through the Hall element. This causes changes in the output voltage of the Hall element, which is processed by subsequent circuits to form a stable pulse voltage signal as the output of the speed sensor. Key electrical technical parameters of Hall-structure speed sensors include: output signal high voltage, low voltage, duty cycle, period, rise time, fall time, and pulses per cycle. To ensure product performance and reliability, these parameters must be quantitatively tested before factory shipment. Test systems featuring integration and intelligence, efficient automatic measurement, software calculation, and graphical or tabular display of test results are increasingly favored by automotive speed sensor manufacturers. A comprehensive testing device developed for performance measurement of commonly used Hall-effect vehicle speed sensors. Considering cost, the high-speed counter port of a microprocessor is used for data acquisition from the vehicle speed sensor, and software control is used to calculate and graphically display the acquired data. The completed testing device offers advantages such as high testing accuracy, reliable data communication, a user-friendly graphical interface, strong anti-interference capability, simple and intuitive testing process, and low system development cost. It has good market promotion potential, so speed sensors will have huge application prospects in vehicle speed detection. 2) Speed sensors for belt conveyors use Hall sensors, which are sensors that utilize the Hall effect to achieve magneto-electric conversion. The Hall effect was discovered in 1879 and has a development history of over 100 years, but its application gained attention and widespread adoption in the 50s of this century due to the rapid development of microelectronics, leading to the continuous development of various Hall elements. China began increasing research on Hall elements in the 20s of the 70th century. After nearly several decades of research and development, it is now possible to produce Hall elements with various performances, such as standard type, high sensitivity type, low temperature coefficient type, temperature/magnetic measurement type, and switch-type Hall elements. Due to the characteristics of Hall sensors, such as high sensitivity, good linearity, high stability, small size, and high temperature resistance, they are widely used in various industrial fields including non-electrical quantity measurement, automatic control, computer devices, and modern military technology.

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