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Old 12-22-2009, 08:33 AM   #1
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Longer On Time for Occupancy Sensor?


Hi;
I have a RAB LOS 8000i/120 occupancy sensor on a fluorescent fixture.
The max on time after no occupancy is 15 minutes. I would like to increase that to between 30 and 60 minutes.

I have not seen a sensor that will allow for such a long on time, so I was considering making a mod to the one I have.
Problem is, that if I open the switch, it is no longer UL or any type approved, and I believe that would violate NEC to re-install.

Does anyone know of a switch with a longer on time?

I don't want to just leave the light on all day because it's 2x40w tubes, so that's a lot of power to be wasting. The room gets used relatively infrequently, but sometimes people come and go within a short time, and the light is being cycled a lot.

Thanks

FW

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Old 12-22-2009, 11:39 AM   #2
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Longer On Time for Occupancy Sensor?


Might want to contact Leviton and ask...
http://www.leviton.com/OA_HTML/ibeCC...&section=13743

Otherwise this would be a simple thing for an electronic type person to design. You could maybe go to a university electrical engineering department and hire some broke student to design what you want.

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Old 12-22-2009, 12:33 PM   #3
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Longer On Time for Occupancy Sensor?


Leviton makes a commercial grade sensor that can be adjusted for 30 min. You would have to go to an electrical supply store to purchase. This is not something that Lowes/Home Depot would have on the shelf
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Old 12-22-2009, 01:57 PM   #4
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Longer On Time for Occupancy Sensor?


Quote:
Originally Posted by Billy_Bob View Post
Might want to contact Leviton and ask...
http://www.leviton.com/OA_HTML/ibeCC...&section=13743

Otherwise this would be a simple thing for an electronic type person to design. You could maybe go to a university electrical engineering department and hire some broke student to design what you want.
Actually, I do have the knowledge/education to make something like this myself, but I am hesitant to open the thing up, since most of these devices are not "hacker" friendly.
Once I remove it from service, I will take a look at it. If it looks like I can open and modify without damaging anything, I might give it a try.
I think I can make a determination as to whether or not it is safe to make a mod.

FW
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Old 12-22-2009, 02:09 PM   #5
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Longer On Time for Occupancy Sensor?


Quote:
Originally Posted by HIVOLT View Post
Leviton makes a commercial grade sensor that can be adjusted for 30 min. You would have to go to an electrical supply store to purchase. This is not something that Lowes/Home Depot would have on the shelf
I checked out the site, but I think the commercial grade requires a relay, as it operates on low voltage. Besides that, I think that's out of my price range.

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Old 12-22-2009, 02:19 PM   #6
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Longer On Time for Occupancy Sensor?


Well the trick would be to use low voltage devices for the occupancy detection, then use that to feed an "approved" contactor (relay) enclosed in an approved electrical box.

And of course mount your low voltage stuff in a large well ventilated box as well.

Security systems commonly use low voltage motion sensors (12vdc). And you could get a U.L. approved low voltage power supply, etc.

And you could get off the shelf "delay relays".

Delay relays...
http://www.google.com/#hl=en&source=...c9c32d20fe6232

Security system motion detectors...
http://www.google.com/#hl=en&q=Secur...c9c32d20fe6232
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Old 12-22-2009, 07:14 PM   #7
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Longer On Time for Occupancy Sensor?


Leviton makes a 120v sensor. Another company to check is Watt Stopper. I install these all the time and they are not cheap.
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Old 12-22-2009, 09:03 PM   #8
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Longer On Time for Occupancy Sensor?


If they use a 555 or similar timer IC, all you'd need to do is put a capacitor in parallel with the existing timing cap.

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