German essa sensor essa model essa price

essa sensor precisely measures the actual displacement of the detected product by detecting the absolute position of the movable magnetic ring through internal non-contact measurement and control technology; the high precision and high reliability of this sensor have been widely applied in thousands of practical cases. Since the movable magnetic ring for position determination and the sensitive element are not in direct contact, the sensor can be used in extremely harsh industrial environments and is not easily affected by oil stains, solutions, dust, or other contaminants. In addition, the sensor uses high-tech materials and advanced electronic processing technology, so it can be used in high-temperature, high-pressure, and high-vibration environments. The sensor output signal is an absolute displacement value; even if the power is interrupted and reconnected, data will not be lost, and there is no need to re-zero. Since the sensitive element is non-contact, even with continuous repeated detection, it will not cause any wear to the sensor, which can greatly improve detection reliability and service life.

essa sensor principle

Photoelectric sensors achieve control by converting changes in light intensity into changes in electrical signals. Generally, a photoelectric sensor consists of three parts: a transmitter, a receiver, and a detection circuit. The transmitter emits a light beam toward the target. The emitted light beam generally comes from semiconductor light sources, such as light-emitting diodes (LED), laser diodes, and infrared emitting diodes. The light beam is emitted continuously, or the pulse width is changed. The receiver consists of photodiodes, phototransistors, and photocells. Optical components such as lenses and apertures are installed in front of the receiver. Behind it is the detection circuit, which filters out valid signals and applies them. In addition, structural components of photoelectric switches include emitter plates and optical fibers.

essa sensor classification

1) Slot-type photoelectric sensor: A slot-type photoelectric sensor is formed by mounting a light emitter and a receiver face-to-face on both sides of a slot. The emitter can emit infrared or visible light, and the light receiver can receive the light when there is no obstruction. However, when the detected object passes through the slot, the light is blocked, the photoelectric switch acts, outputs a switching control signal, cuts off or connects the load current, thereby completing one control action. The detection distance of slot-type switches is generally only a few centimeters due to limitations of the overall structure. 2) Through-beam photoelectric sensor: If the emitter and receiver are separated, the detection distance can be increased. An emitter and a receiver form a through-beam separated photoelectric switch, referred to as a through-beam photoelectric switch. The detection distance of through-beam photoelectric switches can reach several meters or even tens of meters. When using a through-beam photoelectric switch, install the emitter and receiver on both sides of the path through which the detected object passes. When the detected object passes, it blocks the light path, and the receiver acts to output a switching control signal. 3) Retro-reflective photoelectric switch: The emitter and receiver are installed in the same device, and a reflector is installed in front. It utilizes the reflection principle to achieve photoelectric control, known as a retro-reflective (or mirror-reflective) photoelectric switch. Under normal conditions, the light source emitted by the emitter is reflected back by the reflector and received by the receiver; once the detected object blocks the light path and the receiver does not receive light, the photoelectric switch acts and outputs a switching control signal. 4) Diffuse-reflective photoelectric switch: The detection head of a diffuse-reflective photoelectric switch also contains an emitter and a receiver, but there is no reflector in front of the diffuse-reflective photoelectric switch. Under normal conditions, the receiver cannot find the light emitted by the emitter. During detection, when the detected object passes, it blocks the light and reflects part of it back; the receiver then receives the light signal and outputs a switching signal.

essa sensor application cases

1) Application of photoelectric sensors in laser weapons: Since photoelectric sensors are particularly sensitive to infrared radiation, visible light, or both, they are more likely to become targets of laser attacks. In addition, electronic systems and the sensors themselves are highly susceptible to interference from thermal noise and electromagnetic noise generated by lasers, preventing normal operation. The main ways laser weapons attack photoelectric sensors on the battlefield include: "blinding" the sensor with a laser beam of appropriate energy, making it unable to detect or continue tracking already detected targets. Or, if the sensor is guiding a weapon toward a target, blinding will cause it to lose the target. In summary, since sensors play an increasingly important role on the battlefield and are vulnerable to laser attacks, they have become the preferred target for low-energy laser weapons. 2) Application of photoelectric sensors in automatic meter reading systems: With the development of microelectronics, sensor technology, computer technology, and modern communication technology, photoelectric sensors can be used to develop automatic meter reading systems. The aluminum disk of the electricity meter rotates driven by torque generated under the action of eddy currents and magnetic fields. Using photoelectric sensors, the number of rotations of the aluminum disk can be converted into pulse counts. For example: partially blackening the rotating shiny aluminum disk and pairing it with a reflective photoelectric emitter-receiver pair generates pulses at the blackened areas when the disk rotates. The number of rotations of the aluminum disk is sampled and converted into corresponding pulse counts, and sent via an optocoupler isolation circuit to the T0 port of the CPU for counting processing. Using optocoupler isolators can effectively prevent interference signals from entering the microcomputer. Combined with other transmission methods, an automatic meter reading system can be formed. 3) Application of photoelectric sensors in monitoring smoke and dust pollution: A photoelectric sensor is a small electronic device that can detect changes in received light intensity and achieve control functions by converting changes in light intensity into changes in electrical signals. Due to characteristics such as non-contact operation, fast response, and reliable performance, photoelectric sensors are widely used in industrial automation devices and robots. We can use the characteristics of photoelectric sensors to detect smoke and dust conditions, so the strength of the photoelectric sensor output signal can reflect changes in flue gas turbidity. 4) Hygienic washdown-resistant photoelectric sensors: Washdown-resistant sensors provide extremely high reliability and comfort while minimizing operating costs. Equipped with IO-Link interfaces and the proTect+ sealing concept that significantly extends service life, these two new sensors are suitable for demanding application environments and are an ideal solution for the food and beverage industry.

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