What is the coldest temperature your scanner operates

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pbashiri
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What is the coldest temperature your scanner operates

Post by pbashiri » Sat Jan 26, 2019 9:50 am

Hello,

I was wondering what was the coldest temperature your scanner works. I recently manage to use my ZF 5016 in -15 centigrade. It was 5 degree colder than what the manufacturer data sheet indicates.
By the way the C2C registration result of the 119+ scans was 4.7mm

Thanks
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Re: What is the coldest temperature your scanner operates

Post by Tookie » Sat Jan 26, 2019 8:28 pm

IMG-20180228-WA0000.jpg
Only -5 no problems with the scanner although I had to warm the total station up before it would work..
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Re: What is the coldest temperature your scanner operates

Post by JeffT » Sun Jan 27, 2019 1:04 am

I've used a Leica C-10 in -15F outdoors. I used the same scanner in -25F in a cold storage warehouse.

It works for about 6-7 scans, then you can see the mirror start to slow down and finally it will stop and error out. You have to go warm it up before you can continue. I think the grease in the bearings just freezes up.

It's hard to warm that thing back up too. There's like a 10lb block of aluminum in the center that takes a while.

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Re: What is the coldest temperature your scanner operates

Post by bdawood » Sun Jan 27, 2019 5:53 pm

I used my S70 in -20C, with -30C windshield, unlike my S120, I did not have to warm it up after every scan.

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Re: What is the coldest temperature your scanner operates

Post by Felix_the_Cat » Mon Jan 28, 2019 9:45 pm

I used a pair of 330s and a 130 to scan for two weeks straight outside with temps never getting above 20F. Most of the time it was colder. A LOT colder. That job was where I learned about how floppy the stock gitzo tripod is, as I sat and watched the thing sway in the wind on the first day. Three cheers for clunky surveying tripods indeed!

After learning how to turn the fans off we had no major problems at all. I'm calling bs on the whole hand warmer thing next to the vents; given the likely heat capacity of the materials in the scanner there is no way the weeny little heat pads produce enough btu to keep up with the thermal losses in cold temps. Plus having that temp gradient across the scanner makes me worry about internal condensation. Yikes!

Anecdotal impressions: when it was really really cold we had some minor issues. But I never went back to investigate thoroughly, so I can't quantify them properly.

These were my impressions-

First issue - range. They seem to lose quite a bit of range. Like 25%.

Second - it's always a problem when the sun is visible behind what you are scanning, regardless of temp. It makes the whole scan come out too small. In the cold, this was exacerbated dramatically. Any scan with this condition in it was worthless.

So that my $0.02, just about right in terms of value.


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