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