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Tractor Talk Discussion Forum

Re: How accurate?

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PJH

01-05-2013 17:14:29
50.40.238.40



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Store thermometers are interesting. I always just compare them and pick one that agrees with most of the others on the rack. There'll always be an oddball. Don't bring it home, ha. Now if you're into critical temps, you can swill your new thermometer around in a glass filled with crushed ice and water and it should read 32F. Or a pan of boiling water and it should read 212F. You'll have to pay for it first. I used thermometers a lot before I retired, and I'd periodically test mine (and adjust, if needed). Of course that was back in the dark ages. Now they probably have something that they point and it speaks the temp to you.

Tire guages? Never gave them much thought. Now you've got me wondering. I've got three or four and I'm gonna compare them, not that I'll know anything when I'm done.

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c.hess

01-05-2013 17:57:43
68.56.117.38



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 Re: How accurate? in reply to PJH, 01-05-2013 17:14:29  
To be sure of the accuracy by testing the therometer in boiling water you will first have to have a accurate barometer an know if the pressure is at 15.9psi. Any pressure other than that will cause boiling temperature to vary.



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Janicholson

01-05-2013 19:19:38
74.60.94.18



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 Re: How accurate? in reply to c.hess, 01-05-2013 17:57:43  
No flame just fact ---- the atmospheric pressure 760 mm Hg (torr), 29.92 in Hg, 14.696 psi. sea level! Jim



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c.hess

01-06-2013 07:42:22
68.56.117.38



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 Re: How accurate? in reply to Janicholson, 01-05-2013 19:19:38  
Opps i was thinking about my post later an realised i was incorect about pressure .I stand corrected!



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Ultradog MN

01-05-2013 17:48:42
184.100.109.75



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 Re: How accurate? in reply to PJH, 01-05-2013 17:14:29  
I'm curious what elevation you were at and what was the temp you adjusted your thermometer to.



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PJH

01-05-2013 19:19:18
50.40.238.40



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 Re: How accurate? in reply to Ultradog MN, 01-05-2013 17:48:42  
Well - it's 560 ft above sea level here in front of the kitchen stove. The temp I used was 212 degrees. They were Taylor stem thermometers that I used to check hot asphalt, and they had 10 degree incremental markings. The spec range was 250 - 350 degrees, so I only had to know that they were tolerably close. They kinda took a beating being repeatedly jammed into a load of asphalt.



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Ultradog MN

01-06-2013 03:32:59
184.100.109.75



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 Re: How accurate? in reply to PJH, 01-05-2013 19:19:18  
Ahh,
Hot asphalt - not such a big deal.
Now if you were making carmels for the grand kids you'd want to be more accurate :)



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PJH

01-05-2013 19:29:15
50.40.238.40



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 Re: How accurate? in reply to PJH, 01-05-2013 19:19:18  
By the way UD - thanks for the link. I bookmarked it.

Paul



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