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where to buy wire for pid

post #1 of 11
Thread Starter 
Where can I buy wire for a pid rated for -100c
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post #2 of 11
hey

What's the wire for?

Is it the probe wire you mean? Like is it a K probe and you just need to extend it?

K and J both do -100 easy, and if it's an RTD setup and has either PT100 or PT1000 probe on it, really any shielded wire will work to extend it, as long as you get a good solder on it (don't want to change the resistance or the temp reading will change) and reconnect the shield so it's still 'true'.

If you happen to need something I may have it, just need to know what you're after exactly, or can look up where you'll be able to grab some


Gray
post #3 of 11
Thread Starter 
It's the probe wire. I want to run another temp gauge. I have the thin yellow k type probe wire, but was unsure if it was sufficient for -100c


Quote:
Originally Posted by Gray Mole View Post
hey

What's the wire for?

Is it the probe wire you mean? Like is it a K probe and you just need to extend it?

K and J both do -100 easy, and if it's an RTD setup and has either PT100 or PT1000 probe on it, really any shielded wire will work to extend it, as long as you get a good solder on it (don't want to change the resistance or the temp reading will change) and reconnect the shield so it's still 'true'.

If you happen to need something I may have it, just need to know what you're after exactly, or can look up where you'll be able to grab some


Gray
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post #4 of 11
You can get it custom made like I do here:http://www.omega.com/Temperature/pdf/5TC.pdf

http://www.omega.com/

Super nice guys and they do quality work.
Edited by Sdumper - 12/30/10 at 5:01pm
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post #5 of 11
Ah right

Yeah, I'd recommend Ebay really, way way cheaper.

The yellow stuff (if it's a cheap 'came with the meter' kind probe) can be a bit awful at -100 reading. Depends on the rating and quality.

If it's rated for -50 or warmer then it's pretty bad at -100 but still 'tries hard'

If it's rated for -70 or colder, then it usually does pretty good.

I've been using some -70 rated braided stuff and it's as accurate to -100 as the -100 rated stuff I have that I keep for the meter.

Pretty much all the good electronics shops (Like RP or something) will have decent K wire, and they may even be able to weld to length too.

If you just want to buy a roll and make probes, you can twist, solder the end, and then chop the wire through the solder. not quite as accurate as a weld, but a couple degrees at most difference, if anything, from a true reading.

Ebay, you can usually find a 15' roll for 10 to 20 bucks. Then you can make up any you need, and add some for monitoring all the 'trouble spots' like condensing temps, discharge temps, etc.

Gray
post #6 of 11
That's actually not bad SD. Price including welds are good. At least you know the ratings for sure.

I've got a small welding setup for low power welds on them, so I just make 'em up as I go from the roll, but when I was looking for prewelded lengths, it got pricey.

Gray
post #7 of 11
Thread Starter 
Thanks, I think this is route I'll go

Quote:
Originally Posted by Sdumper View Post
You can get it custom made like I do here:http://www.omega.com/Temperature/pdf/5TC.pdf

http://www.omega.com/

Super nice guys and they do quality work.
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post #8 of 11
Thread Starter 
What gauge do you recommend?
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post #9 of 11
Don't see much on tech specs for different sizing.

Mixed bag. I like thinner for faster response, but thicker is a bit more durable.

As long as it's nickel-chromel it's supposed to be good to -200c but if there's any question on speed of response, or variation in accuracy for size, could be an idea to just call them and find out.

Though really, if you're only in need of -100c relative accuracy, I'm not sure it's that crucial.

But I'm a big fan of the thinner gauge. It's held up ok for me, but it does snap on occasion when I'm swapping again and again.

If it's a one time install, thin is ideal.

If you're planning to swap locations regularly and want a bit more durability, go thick.


Gray
post #10 of 11
Quote:
Originally Posted by closeracing View Post
What gauge do you recommend?
Give them a call but I believe 20 gauge is rated to -130c and they recommend 30 gauge for LN2.

I used 20 gauge on my 3 stage and it worked fine at -140c...
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