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Old 07-01-2017, 12:17 PM   #1
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Timed Circuits

I have a few 12 volt circuits I would like to dummy proof by using a time delay type relay - I think its called a "INTERVAL ON" style - so meaning you flip the switch or press the button and the circuit is energized for a time period, perhaps one hour typically, then needs to be reset to turn back on.

I guess trying to simulate a building occupancy sensor (and maybe that's what I really should have)

but I am wondering specifically if anyone has any recommendations for these for a marine environment.
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Old 07-01-2017, 12:23 PM   #2
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Do you mean they need to be IP-rated to withstand saltwater splashing?

Or mounted inside, just robust?

How many amps continuous are the loads, if high may need a good relay as well?
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Old 07-01-2017, 12:27 PM   #3
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This claims to be waterproof, cheap enough to just try if it works carry spares

https://www.amazon.com/Timer-Delay-R.../dp/B00PD65UGA
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Old 07-01-2017, 12:31 PM   #4
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TE's AGASTAT 7000 series is a more serious bit of kit, with pricing to match.
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Old 07-01-2017, 12:37 PM   #5
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Quote:
Originally Posted by john61ct View Post
Do you mean they need to be IP-rated to withstand saltwater splashing?

Or mounted inside, just robust?

How many amps continuous are the loads, if high may need a good relay as well?
Interior.. 5 amps
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Old 07-01-2017, 12:56 PM   #6
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Square D / Schneider Electric 9050JCK46V36 series single shot style is what we use on our head. It energizes for up to 10 minutes. It is in our system as a safety in case of a seal failure, so the head doesn't run continuously.
There is a similar style that can be programmed several different ways. Check the Schneider site, or MSC and similar supply houses.
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Old 07-01-2017, 02:51 PM   #7
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Have you thought about using a mechanical timer? I use a one hour timer to control the 12V fuel pump to transfer fuel from a main tank to the day tank.
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Old 07-02-2017, 08:07 AM   #8
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Remember a unit that will open a DC circuit should be DC rated for the amps involved.
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Old 07-02-2017, 08:24 AM   #9
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Agastat is the industry standard. If you buy adjustable its more versatile.
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Old 07-02-2017, 08:54 AM   #10
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Remember a unit that will open a DC circuit should be DC rated for the amps involved.
Unless it is just used as a sensor, operating a more robust relay with the high-amps rating.

May be cheaper, but yes an additional point of failure.
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Old 07-02-2017, 10:18 AM   #11
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Unless it is just used as a sensor, operating a more robust relay with the high-amps rating.

May be cheaper, but yes an additional point of failure.
This is how ours is installed. It actuates an 80 amp solenoid to power the system.
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Old 07-02-2017, 01:07 PM   #12
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Quote:
Originally Posted by kev_rm View Post
I have a few 12 volt circuits I would like to dummy proof by using a time delay type relay - I think its called a "INTERVAL ON" style - so meaning you flip the switch or press the button and the circuit is energized for a time period, perhaps one hour typically, then needs to be reset to turn back on.



I guess trying to simulate a building occupancy sensor (and maybe that's what I really should have)



but I am wondering specifically if anyone has any recommendations for these for a marine environment.


A little while ago I used a cheap timer and relay to create a timer for my fuel transfer pump. Definitely not designed for a "wet" environment but I used it below the helm station inside my PH. A very dry environment. You can see what I did in this thread.

Yet another silly "upgrade". Fuel transfer relay
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