German HESSE+CO sensor HESSE+CO model HESSE+CO price

HESSE+CO sensor is a device capable of detecting the proximity of objects. It utilizes the sensitivity of a displacement sensor to approaching objects to identify proximity and output corresponding switching signals; therefore, proximity sensors are often referred to as proximity switches. It is a general term for sensors designed to replace contact-based detection methods such as switches, with the aim of non-contact detection of the target object. It can detect movement and presence information of the object and convert it into electrical signals.

HESSE+CO sensor classification

1) Laser speed measurement: With the rise of modern precision manufacturing and the demand for cost savings, non-contact speed sensors will gradually replace contact speed sensors. Currently, the non-contact laser speed sensors with higher accuracy and most commonly used on the market are ZLS-Px aberration speed sensors. The aberration speed sensor has two ports: one transmitting port that emits a 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 moved by the measured object is determined, and combined with internal algorithms of the sensor, the speed of the measured object is output in real time. As shown in the figure, (1)LED light emission port, (2) camera reception port, (3), (4) terminal blocks, (5) mounting screw holes. (1)LED light emission port emits laser towards 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 through algorithms. ZLS-Px aberration speed sensors can simultaneously measure speed and length in two directions. They can not only detect whether the measured body has stopped, but also detect the direction of motion of the measured body. Fix the sensor on a stable bracket to ensure that the rotating process of the rotating object does not generate excessive vibration, thereby enabling the 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 speed measurement, traffic vehicle speed measurement, and golf ball speed measurement. Radar speed sensors can meet these requirements.

HESSE+CO sensor principle

A transmissive speed sensor consists of a slotted or apertured 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 slots. 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 slots on the disk, the rotational speed of the shaft under test can be measured. The number of holes or slots on the disk is usually set to sixty, so 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 specialized speed-measuring reflective paper tapes (adhesive tapes), aluminum foil or other reflective materials can also be used as substitutes, and 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 the corresponding electrical signal 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 the transmissive type, vibration reduces the service life of the light source, so it is not suitable for use in conditions with strong vibration. The reflective type has no mechanical connection with the measured shaft, making it easy to use.

HESSE+CO sensor industry applications

1) Modern automobiles 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 signals from sensors measuring vehicle running speed will have a significant impact on these control units. Automotive speed sensors mostly adopt Hall-effect structures. A Hall speed sensor is a magneto-electric sensor based on the Hall effect, featuring high sensitivity to magnetic fields, stable output signals, high frequency response, strong anti-electromagnetic interference capability, simple structure, and ease of use. It mainly consists of permanent magnets with specific pole pairs (generally 4 or 8 pairs), Hall elements, rotating mechanisms, 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 stable pulse voltage signals as the output of the speed sensor. Main electrical technical parameters of Hall-structure speed sensors include: output signal high voltage, low voltage, duty cycle, period, rise time, fall time, and number of pulses per cycle. To ensure product performance reliability, quantitative testing of these parameters must be performed 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. Based on cost considerations, 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 adopt 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. However, 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 70 century. After nearly several decades of research and development, it is now possible to produce Hall elements with various performances, such as ordinary type, high-sensitivity type, low temperature coefficient type, temperature/magnetic measurement type, and switch-type Hall elements. Due to the characteristics of Hall sensors, including high sensitivity, good linearity, high stability, small size, and high temperature resistance, they have been widely applied in various industrial fields such as non-electrical quantity measurement, automatic control, computer devices, and modern military technology.

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