Capacitive sensors(Capacitive Proximity Switches)
sensor Capacitors are non-contact and non-electrically connected sensors that act against metals and often non-metals. These sensors are another type of proximity sensors that are very similar to induction sensors and are suitable for controlling surfaces in tanks that are filled with powder and liquid content. They can also be used as pulse generators to control the program status of machines for counters and to detect almost all metallic and non-metallic materials..
Characteristics of capacitive sensors
• Metal body
• Output protected against short circuit and overload
• NPN and PNP type
• Cable and socket
• Sensitivity distance adjustment by 20-round potentiometer
• Special type (self monitoring)
• This sensor has pulses added to the output Which is used to check the safety of the sensor. There are cases when the sensor cable is disconnected or the sensor is not able to react if there is a component in front of it due to failure. If there are pulses, it can indicate the failure of the sensor, which in some cases Occasionally prevents accidents.
Applications of capacitive sensors
- Check whether the soda glass is full or empty
- Liquid height control behind the glass tank
- Control the curvature of the bar
- Color frame filling control
Reflective light sensors (one-way)
Optical sensors are part of modern sensors that are based on
light sensor One-way reflective optics, which are among the cheapest and simplest sensors, have a receiver and a transmitter in one body.
The light sent from the transmitter is returned by the receiving object (without the use of a reflector), the transmitted light can be visible red – infrared or laser. There are also special types of fiber optic sensors.
But because in this Optical sensors, The received signal is weak, as a result, the amount of Excess-Gain is reduced, and we will have a shorter operating distance of up to two meters (the distance depends on the amount of reflection of the object).
Applications of one-way optical sensors
- Rail end control
- Control the length of the piece
- Automatic traffic control doors
- Detection of printed circuit fibers in the production line
Optoelectronic Through-beam Sensor
this sensor Are two-sided. On one side is the transmitter and on the other side is the receiver.
These sensors use visible-madon red and laser light. The generated waves are sent by the transmitter. The receiver is installed in front of the transmitter. When there is no barrier between the receiver and the transmitter, these waves reach the receiver. If there is an obstacle, these waves will no longer reach the receiver.
Applications of one-way optical sensors
- Material control on the conveyor
- Production height control
- Empty glass detection
- Car motion control (in car wash)