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Old 03-24-2019, 11:13 AM   #1
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Default pir sensor positioning

I would like to know some guidelines about placing a pir sensor in a office and meeting room setup.

There is a meeting room to which there are three entries. the sensor should be able to detect the motion from all these three entries and should be able to switch on the lights. Please advice me. Drawing attached.

Lighting area of interest: Meeting room

Entry points:
1) From president office
2) From office
3) From waiting room.

Attached also the pir sensor detection range picture.
Attached Thumbnails
pir sensor positioning-img_20190324_203744.jpg  

Attached Files
File Type: pdf FALSE CEING LAYOUT_MP.pdf (175.0 KB, 8 views)
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Old 03-24-2019, 11:27 AM   #2
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You can have multiple sensors in parallel. If they overlap coverage area that's fine. You need to detect not only people entering the room, but the people while they are in the room, so the lights don't shut off on them while they're using the room. If you place one in each back corner facing the entry points as well as the meeting space you should be fine. You need to draw it out to verify.

I did not open your attachment so I have no idea how big the room is. It may need more sensors.
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Old 03-24-2019, 11:55 AM   #3
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The meeting room dimensions are 5.5 meters X 4.5 meters
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Old 03-24-2019, 12:04 PM   #4
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Put as many up as possible. Nothing is more annoying than having to walk back and around, or wave your arms for lighting that was on a second ago.
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Old 03-26-2019, 08:08 AM   #5
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If this is for lighting, I think they've made a poor choice.
Look at the traffic patterns in the room. PIRs are most sensitive to motion across their field of view. Probably one near each door.
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Old 03-26-2019, 11:57 AM   #6
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when they don't specify sensors and i have a choice i use

Leviton OSC15-I0W

they have a 20' radius at 8' high....you can put 3 on 1 power relay

They are cheapest ones i can find that are not a no-name brand.

I pay 49$ us for them and power relays cost 22$ us
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Old 03-26-2019, 11:58 AM   #7
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when they don't specify sensors and i have a choice i use

Leviton OSC15-I0W

they have a 20' radius at 8' high....you can put 3 on 1 power relay

They are cheapest ones i can find that are not a no-name brand.

I pay 49$ us for them and power relays cost 22$ us
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Old 03-26-2019, 12:37 PM   #8
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Quote:
Originally Posted by GrayHair View Post
If this is for lighting, I think they've made a poor choice.
Look at the traffic patterns in the room. PIRs are most sensitive to motion across their field of view. Probably one near each door.
I agree with this, one in each location where you'd normally have a switch adjacent to an entry point that covers the room and possibly an additional ceiling mounted sensor over the conference table if the room size dictates.

The Leviton sensor Tonedeaflisted is a great choice for those normal switch locations.
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