photoelectric relay

photoelectric relay

[¦fōd·ō·i′lek·trik ′rē‚lā]
(electronics)
A relay combined with a phototube and amplifier, arranged so changes in incident light on the phototube make the relay contacts open or close. Also known as light relay.
References in periodicals archive ?
And the rate at which new technologies such as adjustable speed drives and photoelectric relays were adapted into materials handling equipment was nothing short of phenomenal.
* Photoelectric relays find application in conveyor operations
makes photoelectric relays that will sound an alarm or operate a pilot when the turbidity exceeds a certain limit, permitting automatic increase of the coagulant feed.

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