PIR Corridor Lighting

[gtownspark]

I've got a job to replace loads of lighting to all corridors in a few large nursing homes, the customer wants:

"all the lights to be controlled by PIR movement sensors, the movement senors are to be connected to and controlled by daylight senors, which are to be located to ensure that no areas are left in relative darkness"

How would you interpret that? I'm not quite sure what they're asking for, sorry in advance if I'm being thick!

 

[Robert Turnbull]

Put daylight sensors in the darkest area's on sunlight and pirs in the areas that are required I.e so they capture all entrances to the area. I'd take the switch line though the daylight sensors them to the pirs then to the fittings.

That's what I make of it

 

[gtownspark]

Put daylight sensors in the darkest area's on sunlight and pirs in the areas that are required I.e so they capture all entrances to the area. I'd take the switch line though the daylight sensors them to the pirs then to the fittings.

That's what I make of it

Thanks for your reply Robert, are you saying that if the darkest area becomes too dark (say below 100lux) then the PIR'S would then become active? or that the lights should just switch on without PIR's being activated so in effect they would be on from dusk til dawn regardless?

 

[gutterball]

i read it as they want the pir's to operate when the light levels fall below a certain level.

 

[yellowvanman]

i read it as they want the pir's to operate when the light levels fall below a certain level.

i think that was my first impression - where a photocell will turn on the PIRs which in turn, turn on the lights when someone enters.

 

[Robert Turnbull]

i read it as they want the pir's to operate when the light levels fall below a certain level.

i think that was my first impression - where a photocell will turn on the PIRs which in turn, turn on the lights when someone enters.

Yeah that's what I would do

 

[gtownspark]

Thanks guys, originally I thought they wanted the lights to dim down to say 100lux then turn up when a PIR is activated.

 

[HandySparks]

Most PIRs for lighting control will have a built-in light sensor anyway. Sounds like they're trying to make a simple requirement complicated.

Corridor PIR sensor:
http://www.tlc-direct.co.uk/Products/DNCEDR6PLR.html

 

[dim_bulb]

TLC is brilliant, gives you a picture a description and the cost great website

 

[HandySparks]

TLC is brilliant, gives you a picture a description and the cost great website

I'd agree. They're my "default" supplier because you generally know exactly what you're ordering and how much you'll pay. They do give a small additional discount for larger orders, but I don't rely on this for pricing. I think that suppliers who don't make it easy to order online are missing out big time.

 

[dim_bulb]

That's a good point they would make a killing if they caught on.
Always seem to get on their website when I'm quoting and need prices for things that aren't the norm

 

[Robert Turnbull]

The only thing about a pir with a light sensor is the dark places aren't likely to be the places you want to locate the pir. But if they are then it'll save time. Danlers make good sensors. Flush and surface and even one for a conduit box

 

[bugsy]

use marshalling boxes and interlinked pir/photocell

 

[Adam W]

The PIR sensors I have used have 2 pots which you adjust with a screwdriver -one for distance, one for light level. You can adjust the distance from the PIR to where someone will activate it and you can adjust the minimum light level before the lights will come on.