Proximity Sensors
Detects any material denser than air (as long as there is enough of it). Can be adjusted for sensitivity. Can be affected by dusty environments.
Capacitive Sensor
This product is designed to scan the piston position (of a magnet) in a pneumatic cylinder.
Inductive Magnetic Sensors
______________________________________consist of an electrical resonant circuit (1), a flip-flop (2) and an amplifier (3).
Inductive Proximity Sensors
However, instead of using a reflector, the _____________________ uses the reflective property of the object or work piece that enters its transmission range.
Optical - Diffuse Sensor
Not suitable for dirty environments
Optical - Diffuse Sensor
A reflector is located at a distance from the transmitter / receiver. The reflector reflects the light beam from the transmitter back to the receiver.
Optical - Retro - Reflective Sensor
Sensing distance : 1/2 to 1/3 of through-beam type
Optical - Retro - Reflective Sensor
Long sensing distance: up to 30 meters with some devices. Will detect all but very transparent materials. Must be accurately aligned.
Optical - Through-Beam Sensor
________________________________________ consists of separately assembled emitter and receiver
Optical - Through-Beam Sensor
Sensors with electronic switch outputs
Optical proximity sensors Inductive proximity sensors Capacitive proximity sensor
Generally two sensor designs are distinguished
PNP (positive switching) NPN (negative switching)
Optical sensors use ____________ or _________________ for the detection of objects. Each type of sensor basically consists of two main units: the _________________ and the _________________________.
Red; infrared light Emitter(Transmitter); Receiver
Therefore they should be never used to directly switch a solenoid valve.
Reed Switches
Sensors with mechanical switch contact
Reed switches
Inductive proximity sensors can be used to detect all materials with good electrical conductivity, for example, metals like:
mild steel; stainless steel; brass; aluminum; copper; graphite