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Help with digital thermometer and thermocouples.

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Lochekey

Senior Pink Member
Joined
Sep 13, 2015
So I find myself in need of buying a thermometer and thermocouple so that I can try benching on ln2 at the end of July. I am looking for something cheap as I do not want to make a large investment due to the fact that it may be awhile before I can play with ln2 again.

So I have been shopping around and found some cheap units on eBay and Amazon but I do not know if they will be good enough to get me by until I can invest more heavily. See example below.

https://www.amazon.com/gp/aw/d/B014..._m=ATVPDKIKX0DER&pf_rd_r=EEXSMV95029CTGXNHV5Z

This unit claims it is good down to -200c but it does not come with the right probes for this temperature which leads to the second part of this post.

What type of thermocouple is best for ln2 benching and where can I source them. Once again would like to stay on the low end of the cost spectrum if possible.

I understand I will be giving up some accuracy and repeatability but I am willing to live with that for the current situation.

Unfortunately my background with thermocouples is limited to working on the high end for furnaces were we are more worried about if the thermocouple can withstand the temperature and if the cladding will withstand the hostile environment.


So I'm hoping someone can give me some suggestions for what to look for or just an outright product link that will get me what I need. I'm sure there are things I'm not considering do please educate me and I will try to send any questions as they arise.

Thanks in advance.
 
OP
Lochekey

Lochekey

Senior Pink Member
Joined
Sep 13, 2015
Does the thermocouple that come with this operate down to ln2 temps or did you have to source other ones.
 
OP
Lochekey

Lochekey

Senior Pink Member
Joined
Sep 13, 2015
Priller has his Fluke for sale here.

Edit: Temps are based on type. The K-type is good down to -200C. Source.

Thanks for the heads up on that fluke. Unfortunately it looks like he traded it already.

I thought the same thing about the k type thermocouple but when checking the spec sheets on the ones readily available online they list a lower temperature of -50, hence my confusion. See example below.

https://www.amazon.com/gp/aw/d/B0083T29PE?psc=1
 

Blaylock

"That Backfired" Senior Member
Joined
Jun 5, 2013
Location
Go Blue!
Something's up with them then. They don't fall in any of the catagories listed.

My guess is they're just listed incorrectly. They look exactly like mine.
 

EarthDog

Gulper Nozzle Co-Owner
Joined
Dec 15, 2008
Location
Buckeyes!
The ones I got with mine went all the way down
Yep, same here. I saw -190 or so.

remember, pinpoint accuracy isn't exactly a requirement (though nice and I certainly understand why you want it!!). If your unit says a CPU is CBB at -110C so long as you use that same device, that same CPU is going to CBB at the same temp regardless if a more expensive/accurate model says it does so with more accuracy at a different temp.
 
OP
Lochekey

Lochekey

Senior Pink Member
Joined
Sep 13, 2015
I agree with that Ed I'm not to concerned about accuracy as long as the repeatability is good. We run into this at work a lot. I am not to concerned with the actual temperature it is just a value As far as I'm concerned as long as it reads the same value each time.

I like the unit Janis listed but I'm worried about the delivery time in it. Might do some shipping and see if I can find something similar worth a better delivery time.

Might also pick up a few different thermocouples of of Amazon and hopefully at least one will respond as expected.
 

Janus67

Benching Team Leader
Joined
May 29, 2005
I agree with that Ed I'm not to concerned about accuracy as long as the repeatability is good. We run into this at work a lot. I am not to concerned with the actual temperature it is just a value As far as I'm concerned as long as it reads the same value each time.

I like the unit Janis listed but I'm worried about the delivery time in it. Might do some shipping and see if I can find something similar worth a better delivery time.

Might also pick up a few different thermocouples of of Amazon and hopefully at least one will respond as expected.

If you need to borrow one for the party (unfortunately I won't be attending) shoot me a PM and if you pay the shipping to/from me you can borrow it. Or if Joe plans to go still he can pick it up before driving out, whichever works.
 
OP
Lochekey

Lochekey

Senior Pink Member
Joined
Sep 13, 2015
Hey Janus thanks for the offer. I will let you know what I'm gonna do after a little more research. If I don't find one in the next week or so I will pm you so wet can work details out.