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Pressure switches
Where a predefined level of pressure or vacuum of
a fluid (air, water, oil etc.) in a system is to be
controlled a pressure switch can be used.

For monitoring of fixed thresholds both electromechanical and electronic types are available.

Where continuous control feedback is required within
a process electronic types are available, providing
4 – 20mA or 0 – 10Vd.c. outputs.

Limit switches
Used to detect the presence or absence of rigid objects, these devices serve to provide an input signal to a control system.

Available with metal or plastic cases, and a variety of actuators,
they are ideal for applications where direct contact will guarantee the object detection.

CENELEC conformity (EN 50041 or EN 50047) ensures mechanical interchangeability. Positive opening
(to IEC/EN 60947-5-1) versions guarantee operation of the normally closed contact in safety applications.

 
Proximity sensors
With their fast response and high operating rate proximity sensors are ideal for application which preclude the use of a limit switch. This includes fragile or freshly painted objects, where any contact may entail the possibility of physical damage to the object.

Able to sense objects at a distance of up to 60mm, with no physical contact, wear and tear is avoided ensuring a long service life. In addition their resin encapsulation provides excellent resistance to many of the contaminents encountered in industrial environments.

 
Photoelectric detectors
Suitable for the detection of any type of object (including opaque, transparent, reflective etc.) they may be used in a variety of industrial, commercial and domestic applications.

Five systems of detection are employed:

- Thru-beam, where the object breaks the beam between a transmitter and receiver.

- Reflex, where the beam to be broken is returned from a reflector with the transmitter and receiver are housed in the same casing.

- Polarised reflex, where the transmitted beam is horizontally polarised and the reflector rotates this by 90° for acceptance by the receiver.

- Diffuse, which detects the reflection of the beam from the object passing by.

- Diffuse with background suppression, where the sensitivity can be adjusted to prevent spurious detection where the background behind the object is also reflective.