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Sensors and limit switches

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Movement sensor complete Kanlux 08391 Black Screwed terminal Plastic

Movement sensor complete Kanlux 08391 Black Screwed terminal Plastic

Starting at
€7.71 +VAT
CZK 189.09
  • Manufacturer: Kanlux
  • Manufacturer Code: 08391
  • EAN: 5905339083913
  • Model: Movement sensor
  • Sensor type: Passive infrared
  • Mounting method: Surface mounted (plaster)
  • Connection type: Screwed terminal
  • Material: Plastic
Supplier:
LE
LED21 s.r.o.
verified supplier
Response time: usually up to 2 days
Movement sensor complete Kanlux 23452 White Screwed terminal Plastic

Movement sensor complete Kanlux 23452 White Screwed terminal Plastic

Starting at
€6.47 +VAT
CZK 158.68
  • Manufacturer: Kanlux
  • Manufacturer Code: 23452
  • EAN: 5905339234520
  • Model: Movement sensor
  • Sensor type: Passive infrared
  • Mounting method: Surface mounted (plaster)
  • Connection type: Screwed terminal
  • Material: Plastic
Supplier:
LE
LED21 s.r.o.
verified supplier
Response time: usually up to 2 days
Movement sensor complete Kanlux 08390 White Screwed terminal Plastic

Movement sensor complete Kanlux 08390 White Screwed terminal Plastic

Starting at
€7.76 +VAT
CZK 190.42
  • Manufacturer: Kanlux
  • Manufacturer Code: 08390
  • EAN: 5905339083906
  • Model: Movement sensor
  • Sensor type: Passive infrared
  • Mounting method: Surface mounted (plaster)
  • Connection type: Screwed terminal
  • Material: Plastic
Supplier:
LE
LED21 s.r.o.
verified supplier
Response time: usually up to 2 days
Movement sensor complete Kanlux 00464 White Screwed terminal Plastic

Movement sensor complete Kanlux 00464 White Screwed terminal Plastic

Starting at
€4.42 +VAT
CZK 108.43
  • Manufacturer: Kanlux
  • Manufacturer Code: 00464
  • EAN: 5905339004642
  • Model: Movement sensor
  • Sensor type: Passive infrared
  • Mounting method: Surface mounted (plaster)
  • Connection type: Screwed terminal
  • Material: Plastic
Supplier:
LE
LED21 s.r.o.
verified supplier
Response time: usually up to 2 days
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Sensors and limit switches

Limit switches are basic electromechanical devices. They can be found in industrial automation systems, machines, as well as in simpler constructions of building automation systems. They are used to achieve the extreme position by the moving element of the indicated device. This provides protection against excessive movement.

Sensors and limit switches: description of operation

Sensors and limit switches are essential for the creation of safe power networks. In addition, they serve to close the control circuit when a certain position is reached. This makes it possible to perform switching in electrical circuits under the influence of a change in the position of an object. To limit switch can operate flawlessly, it must be equipped with a wired sensor which is usually an inductive sensor. It allows you to detect changes in the field associated with the modification of the position of specific elements. However, you need to know that not all sensors will be compatible

with limit switches. Therefore, it is worth purchasing these elements from reputable manufacturers, buying them in sets. Then you can be sure that they will work very well, without the risk of any failure. This will be the effect of their maximum fitting. They will not have any problems performing switching in electrical circuits, which is their main function. You can also then expect them to last for many years.

The principle of operation of limit switches is based on electromechanical switching of the position of the movable contact. It occurs as a result of physical contact between an external object and an element that exerts pressure on the contact lever of a limit switch. When an actuator connected with a limit sensor is rotated or moved, a change in the position of the electrical contacts occurs. Limit sensors are distinguished by their long service life, impressive level of precision during switching and under unfavourable environmental conditions. In addition, this type of accessory has a high ability to switch electrical loads with high power. Inductive sensors are especially used in speed measurement. On the other hand, photoelectric sensors are necessary for counting. On farms, capacitive sensors are used, for example, for flour or feed. Their task is to signal the correct level of granules.

Limit switches are used as disposition transmitters for automatic controls, for positioning, and also for limit switching. Therefore, they are commonly used in machines such as tool machines or press, as well as in universal production centers, robots, and assembly and transport equipment. In the field of machine building and various devices such as disposition transmitters for automatic control limit switches prove to be irreplaceable. Their simple design, multiple switching modes and consistent monitoring guarantee consistent high quality and reliable operation in standard operation. The limit switches can even be used under harsh environmental conditions, as they are resistant to vibration, shock loads, temperature fluctuations, high accumulation of trimmings, or the use of aggressive cooling lubricants. They have protection degree IP67, so their reliable operation is guaranteed.

Sensors and limit switches: How do I choose them?

The main role of limit switches and sensors is to detect the desired position of a moving element and, in response to its achievement, to switch on or off the power supply. Extending this basic operation are additional functions of signaling or counting. Therefore, the selection of limit switches should be based on their specific type. Then they will be best selected for the expected application.

Electromechanical limit switches are most often used, because they have a simple structure and under standard conditions they work reliably. The detecting element in them is a movable mechanical lever, connected to an electric switch in the housing. There are also magnetic limit sensors, where instead of a moving lever a pair of magnets is used. As soon as they come close to each other, a current induction occurs, which is interpreted as the approach of an obstacle. Such sensors are described as maximally precise, although it is worth knowing that they may be susceptible to electromagnetic field disturbances. One can also point to optical limit sensors. In this type an optical system is used instead of a lever. The construction, as well as the operation of such a limit switch are more complicated. It should also be taken into account that this type of system must operate in clean conditions. If there would come to dusting of transmitter or receiver, it could activate protection mechanism, together with activation of switch. Optical limiters are mainly used in robotics, where maximum precision is expected along with flawless operation.

If someone wants to use limit switches for basic operation, it is enough to get a simple circuit. Its task will be to control the state of the circuit. Then, there is no need to signal reaching an obstacle or counting particular obstacles. On the other hand, when one expects to use limit switches for more extensive applications, then one should opt for limit switches equipped with counting of work cycles and with many other functionalities. Of course, care should be taken to ensure that, regardless of the operating conditions, the limit switches will indicate the absence of an obstruction at the expected location. Parameters to be considered when purchasing limit switches and sensors are also: limit of movement range, lever construction, type of contacts, frequency of operation, speed of operation, operating conditions, durability, purpose and voltage. Selection of a limit switch will be possible only after specifying these issues.