Introduction

The Optical Proximity Switches are a reliable solution for automation where other Proximity Switches have limitations

These are Infra-red type sensors incorporating advance and reliable technology.

These switches have a distinct advantage of higher sensing distance over Inductive and Capacitive type of switches.

These can work more reliably in a noisy electromagnetic radiation environment. As an infra-red wavelength is used, it is immune to visible light interference.

Applications

These switches are very useful for counting and position sensing applications in Pharma, Food, paper, plastic & automobile industry. They also work effectively in level sensing applications for solids, grains, sand, ice and other non-metallic bulk material. Some typical applications are:

• Component positioning sensing in Electronic Industry.
• Counting of bottles, jars, Containers etc.
• Glass sheet position sensing.
• For security & safety in Machine tools, presses etc.
• PColor sensing applications.

Principle of Operation

These switches incorporate an infra-red transmitter & receiver device housed in a single enclosure or separate enclosures. The precision pulsed transmitter beam is interrupted or reflected by the object. The advanced electronic circuit generates an effective output signal when the object is sensed.

Thru-Beam

(TB) type switches have separate transmitter & receiver. The object is sensed when the beam is interrupted.

Diffuse Scan

(DS) type switches have both transmitter & receiver in the same enclosure. The closely focussed beam is reflected back by the object.

Retro-Reflective

(RR) type switches use a special reflector to reflect back the beam. When an object interrupts the beam, an output signal is generated. These models have grater sensing distance compared to DS type. The receiver does not consider the reflection from the object.

Explanation of Technical Terms

Standard Object

The sensing distance specified for DS switch is considered with a white object having minimum 90% reflectivity.

Sensing Distance

This is the maximum specified range of a sensor measured at 25°C using a standard object.

Construction

These switches are offered in tabular metallic, acrylic & plastic enclosures. Standards models are available with integrated 2-meter long cable. Switches with built-in (Male) connectors (International M8 / M12 size) for quick connections are also available.

Switches with Optical Fibre

Special model of Optical Switches are available with an integrated Optical Fibre cable for flexible mounting and for sensing miniature objects / high temperature objects. This switch is of through-beam type and is available in H type enclosures.

Tubular / Rectangular / Slot type Enclosures

Ordering Codes for Standard Switches

Type	Ordering Code	Supply	Mounting	Dimensions	Sensing Distance
Optical	SW 6051 PO D1 B12 DS SW 6051 PO D1 B18 DS SW 6051 PO D1 B30 DS SW 6051 PO D1 B18 RR SW 6051 PO D6 B30 RR SW 6055 PO A2 B18 TB SW 6055 PO A3 B30 TB	10-30 V DC 10-30 V DC 10-30 V DC 10-30 V DC 24 V DC 110 V DC 240 V DC	- - - - - - -	M12 * 85 M18 * 85 M30 * 85 M18 * 85 M30 * 85 M18 * 85 M30 * 85	50 mm 200 mm 1 meter 1 meter 3 meter 2 meter 10 meter