Datec photo amplifier, Transmitter & reciver
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Datec 1 and 2 channels with time delay adjustment 0-10 sec
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1 Channel Usually the relay and the transistor will activate, when
transmitter and receiver are able to see each other,
and fall off when the infrared light beam is
disconnected.
Here is Datec Transmitter & receiver
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2 channel amplifier for photocells.
From 2 switches marked “light” and “dark” it is
possible to chose output function for each of the 2
channels.
Here is Datec transmitter & reciver
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Transmitters and receivers “compact”
These units connect to 10-30VDC and operate without an external amplifier

Datec transmitter and receiver to Datec amplifier for photocells.
RS and TS units: Stainless steel
Other types: Black NORYL