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Old 07-12-2012, 01:14 PM   #1
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Photo Electric Switch


I'm trying to have an outdoor fountain automatically turn off when it gets dark out and back on at daylight. This is directly opposite of how my photoelectric(PE) switch operates my flagpole light. So... How do I get the typical PE switch to work in reverse?

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Old 07-12-2012, 02:17 PM   #2
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Originally Posted by MNova View Post
So... How do I get the typical PE (NC) switch to work in reverse?
I don't think you can.

You'll need a different switch...
either double throw or NO (vs standard NC).

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Old 07-12-2012, 03:10 PM   #3
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I'm sure they probably make a low voltage inverter for signal wires but its probably ten times more expensive than a new cell. You could use a relay and wire it to the normally closed contact so when the cell goes off the relay opens the contact.
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Old 07-12-2012, 04:38 PM   #4
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I'd use a relay with normally closed contacts.
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Old 07-12-2012, 06:34 PM   #5
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Photo Electric Switch


Use a relay, oh wait, that was suggested... I'd still use a relay.
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Old 07-12-2012, 07:16 PM   #6
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Hosfelt has suitable relays with 120v coils for cheap. The relay contacts have to be suitable for your load so post your fountain pump specs.

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