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Fisher Pierce photocontrols

Fisher Pierce photocontrols

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Weymouth, MA

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Album name:marvinsuggs / Photocontrols
Keywords:Miscellaneous
File Size:262 KB
Date added:Mar 12, 2018
Dimensions:2048 x 1536 pixels
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streetlight98
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Mike McCann


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Mar 13, 2018 at 03:38 PM Author: streetlight98
Awesome! I wonder if they still do this sort of stuff. With their current quality issues, I doubt it lol. I see they're even testing competitors' photocells. Would've loves to take care of all those SunSwitch PCs for them. Around what year was this? Looks like 1990s? If so I'm surprised to not see any DTL photocells since they were growing in size by the mid-90s, starting off in 1990.

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marvinsuggs
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Mar 13, 2018 at 07:10 PM Author: marvinsuggs
That was in 1997. I looked at Google earth pics of the Sun Tech facility and didn't see any kind of testing facility outside.
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Mar 14, 2018 at 12:47 AM Author: marvinsuggs
I think I see some DTLs mixed in there 🤔
streetlight98
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Mike McCann


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Mar 14, 2018 at 05:27 PM Author: streetlight98
Ah yep I looked closer and I do see a few DTLs. Must've been really cool to see these in person. Troughs and troughs of just photocells. Were they controlling anything, like indicator lights, to signify the photocell's functionality? Or did they just glove-test them weekly?

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marvinsuggs
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Mar 15, 2018 at 12:27 AM Author: marvinsuggs
I'm not really sure if they controlled anything.. , they were also seeing how the cases held up
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Apr 03, 2018 at 06:19 AM Author: Ugly1
One of the Fisher Pierce brochures has a chart of monthly burning hours of their photocontrols.It is titled"Typical Burning Hour Schedules For Various Operating Adjustments. This information,gathered over a 10 year period, is based on the operation of roof-mounted controls in the Boston,MA area.Slight variations from the total burning hour figures given above were caused by the weather: +/- 2 percent maximum to the lower adjustment,+/- 4 percent for the higher adjustment. In actual use, where each individual control is subject to different local lighting conditions,greater variation can be expected.
Turn on hours are at 1 footcandle, 5 footcandle, and 35 footcandles.
January- 436, 446, 485
February- 365, 373,453
March-360, 370, 411
April-306, 312, 367
May-277, 288, 334
June-249, 261, 295
July-265, 274, 306
August-299, 309, 338
September-334, 343, 379
October-389, 398, 433
November-416, 424, 468
December-444, 452, 496
Total burn hours- 4,140, 4,250, 4765
So I would assume that photo shows their rooftop test equipment,and that each photocontrol receptacle is connected to an elapsed time meter.
City Of New York astronomic time switches were adjusted to 4,050 burning hours in a regular year,with 4,062 hours and 16 minutes in a leap year. My own Tork astronomic time switches,(connected to elapsed time meters) with the dial adjusted to turn on about 20 minutes after sunset,and about 20 minutes before sunrise("civil twilight schedule") results in a burning time of about 4,070 hours.
streetlight98
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Apr 03, 2018 at 03:48 PM Author: streetlight98
The utility company here bills on the assumption that the lights turn on a half hour after sunset and turn off a half hour before sunrise. In reality that doesn't happen but I think they are conservative with the burn time of the lights because they're not metered, so they don't want to make the cities think they're overcharging.

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