Schneider Telemecanique switch German Schneider Telemecanique model Schneider Telemecanique price

Schneider Telemecanique switch is a switch that measures the operating speed of the measured object and converts it into an output signal. Speed measurement switches include linear speed measurement switches and rotational speed measurement switches. With the development of technology, traditional measuring equipment can no longer meet current needs and has gradually been phased out, while laser speed measurement switches have been widely used. They are of great significance in the product production process. By connecting to a computer, they can perform automated and intelligent measurement control on the measured object. This is the product of the combination of current measurement technology and computer technology.

Schneider Telemecanique switch principle

Photoelectric switches achieve control by converting changes in light intensity into changes in electrical signals. Generally, a photoelectric switch consists of three parts: transmitter, receiver, and detection circuit. The transmitter emits a light beam towards the target. The emitted light beam usually 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, the structural components of the photoelectric switch also include emitter plates and optical fibers.

Schneider Telemecanique switch classification

1) Slot-type photoelectric switch: A slot-type photoelectric switch 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 a control action. Due to limitations of the overall structure, the detection distance of slot-type switches is generally only a few centimeters. 2) Through-beam photoelectric switch: If the emitter and receiver are separated, the detection distance can be increased. A through-beam separated photoelectric switch consists of one emitter and one receiver, 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 and blocks the light path, the receiver acts and outputs a switching control signal. 3) Retro-reflective photoelectric switch: The emitter and receiver are housed in the same unit, with a reflector plate 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 plate 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 plate in front. Under normal conditions, the receiver cannot detect 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.

Schneider Telemecanique switch application cases

1) Application of photoelectric switches in laser weapons: Since photoelectric switches 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 switches themselves are highly susceptible to interference from thermal noise and electromagnetic noise generated by lasers, causing malfunction. The main ways laser weapons attack photoelectric switches on the battlefield include: using a laser beam of appropriate energy to "blind" the switch, making it unable to detect or continue tracking already detected targets. Or, if the switch is guiding a weapon towards a target, blinding will cause it to lose the target. In summary, since switches 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 switches in automatic meter reading systems: With the development of microelectronics, switch technology, computer technology, and modern communication technology, photoelectric switches 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 a photoelectric switch can convert the number of rotations of the aluminum disk into pulse counts. For example: partially blackening a rotating shiny aluminum disk, paired with a reflective photoelectric emitter-receiver pair, generates pulses at the blackened areas as 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 switches in monitoring smoke and dust pollution: A photoelectric switch is a small electronic device that can detect changes in the intensity of received light, achieving 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 switches are widely used in industrial automation devices and robots. We can utilize the characteristics of photoelectric switches to detect smoke and dust conditions, so the strength of the output signal from the photoelectric switch can reflect changes in flue gas turbidity. 4) Hygienic washdown-proof photoelectric switch: Washdown-proof switches provide extremely high reliability and comfort while minimizing operating costs. Equipped with IO-Link interface and the proTect+ sealing concept that significantly extends service life, these two new switches are suitable for harsh application environments and are an ideal solution for the food and beverage industry.

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