-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 > Thermocouples are not appropriate for that temperature range and > application, the cold junction compensation contribution will be > as much as the thermocouple, you may as well dump the thermocouple > and stick the compensator down the tube. I hope you don't mind too terribly much if I just disagree with you a bit there. The specifications for the Fluke 80TK thermocouple module seem to belie your opinion about where thermocouples can be used. Measurement Range: - -50=BAC to 1000=BAC (-58=BAF to 1832=BAF), depending on thermocouple pr= obe used. Accuracy: - -50=BAC to -20=BAC: 2.5% =B1 2=BAC - -58=BAF to -4.0=BAF: 2.5% =B1 3.6=BAF - -20=BAC to 350=BAC: 0.5% =B1 2=BAC - -40=BAF to 662=BAF: 0.5% =B1 3.6=BAF 350=BAC to 500=BAC: 1.75% =B1 2=BAC 662=BAF to 932=BAF: 1.75% =B1 3.6=BAF 500=BAC to 1000=BAC: 2% =B1 2=BAC 932=BAF to 1832=BAF: 2% =B1 3.6=BAF You will notice that the 10 to 30 degrees falls well within the optimum range of -20C to +350C (-40F to +662F) So, I will have to say that I am of completely the opposite opinion on this one. 10 to 30 degrees, be it C or F, falls well within the prime operating range of thermocouples. Well, Fluke ones, at least. With regards to the immersion probe which I mentioned, 80PK-2A K-type immersion probe Measurement range: -40 to 982=BAC (-40 to 1800=BAF) It looks like it fits too. Now, if you were to tell me that the problem was something along the lines of there being an issue with heat flow, I'd accept that, but, having read fluke specs before, "Thermocouples don't work in that range" just doesn't do it for me. Electrosonic shows the 80TK thermocouple module at $124 each, and the 80PK-2A immersion probe at $83 each. All in all, I think it's quite a viable solution. - --Brendan -----BEGIN PGP SIGNATURE----- Version: PGPfreeware 6.5.8 for non-commercial use iQA+AwUBPVqxQgVk8xtQuK+BEQLSogCfTOb3JYbiYSSNCfwUjVQpHV7El0gAlRtV KhGCB/uEInPUXErBDgG2kgA=3D =3D2mHK -----END PGP SIGNATURE----- -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu