Optical sensors can replace conventional limit switches

2nd October 2020
Mick Elliott

The OPB715Z – OPB718Z family of reflective optical sensors from TT Electronics – Optek is in stock at distributor TTI.

This sensor is targeted for medical and industrial process automation applications.

These reflective sensors consists of a GaALAs LED and a Photologic sensor enclosed in an IR transmissive housing.

The sensor is characterised to detect paper at 0.5-inch (12.7 mm).

It has a wide operating distance range and is capable of detecting reflective objects at other distances. The reflective distance depends on the reflectance materials.

These devices are designed to replace conventional mechanical limit switches where long life and reliability are critical.

The switches are designed to easily “snap mount” into a 0.036 inch (0.914 mm) 20 gauge thick material with a rectangular opening of 0.315-inch x 0.472 -inch (8.0 mm x 12.0 mm). The sensor’s panel-mount plastic housing shields stray light and is terminated with 18-inch (457 mm) UL approved 26 AWG wire leads.

The LED is current limited internally for design convenience.

Its output can be specified as either TTL Totem-Pole or TLL Open-Collector.

Inverted output options are available for either output configuration.

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