Zhuoxin

The LH8-E16-A1 proximity sensor is used in various types of sensors, and there is a type of sensor that can be used for objects approaching it; Perception; Components of Ability& mdash; Displacement sensor. This type of sensor does not need to come into contact with the object being detected. When an object moves towards the displacement sensor and approaches a certain distance, the displacement sensor will have a "; Perception;, Usually, this distance is called "&quo;"; Detect distance;. The proximity switch is made by utilizing the sensitivity of displacement sensors to approaching objects. Overview: Different sensors have different detection distances. Sometimes the object being tested moves one after another at a certain time interval and leaves one after another, repeating this process continuously. Different sensor components have different response capabilities to the detected object. This response characteristic is referred to as&quo; Response frequency& nbsp; Feature 1: Non contact detection avoids damage to the sensor itself and the target object. 2. No contact output, long operating life. 3. Stable detection even in harsh environments with water or oil splashes. 4. Reaction speed. 5. Small sensing head, flexible installation. The classification of sensors is because displacement sensors can be made according to different principles and methods, and different displacement sensors have different effects on objects; Perception; The methods are also different, so there are several common sensors: inductive sensors, also known as eddy current sensors, which are composed of three main parts: oscillator, switch circuit, and amplifier output circuit. The oscillator generates an alternating magnetic field. When the metal target approaches this magnetic field and reaches the sensing distance, eddy currents are generated within the metal target, causing oscillation attenuation and even stopping. The oscillation and stop changes of the oscillator are processed by the subsequent amplification circuit and converted into switch signals, triggering the driving control device to achieve non-contact detection purposes. It can be seen that the object that can be detected by this proximity switch must be a conductive body. The measurement of capacitive sensors is usually achieved by forming one electrode plate of the capacitor at the fixed position of the sensor, and the other electrode plate is usually grounded or connected to the equipment casing during the measurement process. When an object moves towards the sensor, regardless of whether it is a conductor or not, its proximity will always cause a change in the dielectric constant between the two plates of the capacitor, resulting in a change in the capacitance of the capacitor and a change in the state of the circuit connected to the measuring head. Therefore, non-contact detection can be achieved. The objects detected by this proximity switch are not limited to conductors, liquids or powders that can be insulated. When a metal or semiconductor sheet with current is placed vertically in a magnetic field, a potential difference occurs between the two ends of the sheet, which is called the Hall effect. The difference in potential between the two ends is called the Hall potential U, which is expressed as U=K· I·B/d， Among them, K is the Hall coefficient, I is the current passing through the thin film, B is the magnetic induction intensity of the external magnetic field (Lorentz force), and d is the thickness of the thin film. It can be seen that the sensitivity of the Hall effect is directly proportional to the magnetic induction intensity of the applied magnetic field. Hall elements belong to this type of active magneto electric converter device and are a type of magnetic sensitive element. It is made on the basis of the Hall effect principle, using integrated packaging and assembly technology. It can conveniently convert magnetic input signals into electrical signals in practical applications, while also meeting the requirements of easy operation and reliability in industrial applications. Hall switches are made using the characteristics of Hall elements, and their input terminals are characterized by magnetic induction intensity B. When the value of B reaches a certain level (such as B1), the trigger inside the Hall switch flips, and the output level state of the Hall switch also flips. The output terminal generally uses transistor output, similar to other sensors, including NPN, PNP, normally open, normally closed, latch type (bipolar), and dual signal output. The Hall switch has characteristics such as no electric shock, power consumption, long service life, and response frequency. It is internally sealed with epoxy resin and integrated, so it can work reliably in various harsh environments. When a magnetic object moves close to a Hall switch, the Hall element on the detection surface of the switch produces a Hall effect, causing a change in the internal circuit state of the switch, thereby identifying the presence of a nearby magnetic object and controlling the on or off of the switch. The detection object of this proximity switch must be a magnetic object. Optoelectronic sensors utilize the photoelectric effect. Install the light-emitting device and photoelectric device in the same detection head in a certain direction. When a reflective surface (the object being detected) approaches, the photoelectric device receives the reflected light and outputs the signal, which can be used to; Perception; There is an object approaching. The photoelectric proximity switch made using photoelectric sensors can detect various substances, but the detection error for fluids is relatively large. Pyroelectric sensor can sense temperature changes. The pyroelectric device is installed on the detection surface of the switch. When an object with a different ambient temperature approaches, the output signal of the pyroelectric sensor changes. By converting the output signal of the sensor, the proximity of the object can be detected. Linear proximity sensor is a linear device belonging to metal induction. After power is turned on, an alternating magnetic field is generated on the sensing surface of the sensor. When a metal object approaches this sensing surface, eddy currents are generated in the metal and absorb the energy of the oscillator, causing the output amplitude of the oscillator to decay linearlyThen, based on the changes in attenuation, the goal of non-contact object detection is achieved. The proximity sensor has sliding contacts and is not affected by non-metallic factors such as dust during operation. It also has power consumption and long lifespan, and can be used in various harsh conditions. Linear sensors are mainly used for intelligent control of analog quantities in automated equipment lines. Appendix: Attenuation Coefficient of Some Common Materials Material Attenuation Coefficient Steel 1 Stainless Steel 0.85 Brass 0.3 Copper 0Other types of sensors. When the observer or system changes the distance to the wave source, the frequency of the approaching wave will shift, which is called the Doppler effect. Sonar and radar are made using the principle of this effect. Doppler effect can be used to make ultrasonic sensor components, microwave sensor components, etc. When an object approaches, the reflected signal received by the sensor will generate a Doppler frequency shift, which can identify whether an object is approaching. These proximity switch sensors are widely used in aviation, aerospace technology, and industry; In daily life, such as hotels, restaurants, and garages, automatic doors and automatic hot air fans are all used; In terms of anti-theft, important places such as data archives, accounting, finance, museums, and vaults are usually equipped with anti-theft devices composed of various proximity switches. In measurement techniques, such as length and position measurement; In control technology, measurement and control of displacement, velocity, and acceleration are also widely used. The usual way to use it is to make it into a proximity switch. Application Case LH8-E16-A1 Proximity Sensor Application: Proximity Switch Sensor Application: With the rapid development of the subway industry and the frequent occurrence of subway traffic accidents, subway screen doors will be increasingly used by subway platforms. Sensors, as excellent instruments for automated and intelligent equipment, will be widely used in the technology application of platform screen doors, and subway accidents will be reduced in the application of sensors. Proximity switch sensors are commonly used in many shield door systems to detect the opening and closing of doors. Generally, two proximity switches are used to detect the opening and closing of doors. In addition, photoelectric switches are also widely used in the system, and all shield door technologies will apply more sensor technologies. It is not difficult to see who is the strong player in the market who applies sensor technology more. Intelligence and automation will be closely linked by sensors. LH8-E16-A1 proximity sensor detects distance from Pingnan cement proximity switch-LH8-E16-A1 two wire normally open_20-250VAC position control switch PROXITYLJC30-3410GK position control switch PROXITYHQA667386BD/99K proximity switch E2A-M30LN30-M1-B1IP66 two-stage deviation switch XTD-PK-10-45 proximity switch TCA-2050AIP54 pull switch XTD-LS-2 sound and light alarm BC-3BF-Y38 sound and light alarm T220-B voltage 220VA sound and light alarm TBJ-150CLH8-E16-A1 proximity sensor detects distance