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 Razonar #81 Posted : 04 May 2022 07:20:04(UTC) Rank: Advanced MemberGroups: Registered Joined: 28/08/2014(UTC)Posts: 998Was thanked: 548 time(s) in 357 post(s) Originally Posted by: Jean Giraud Originally Posted by: Razonar a PT100 (which should have a resistance of 100 ohms at 0 Celsius)Pt100 is simply a designation from EIT90 with Ω as given 1 @ 0.01 °C.The instrument maintenance crew calibrates the XTR's reading fromexpensive secondary standard lab equipment accordingly to BIPM.Platinum wire is not infinitely ductible ... 100 times smaller cross area ?Of same cross area now 100 times longer ?Don't worry, those things work fine for so long.Cheers ... Jean.From your SMath file ( https://en.smath.com/for...rce.ashx?a=43693&b=2 ):andFrom the NIST ( https://nvlpubs.nist.gov...tions/NIST.SP.250-91.pdf at page 77)There you can see that Wr is dimensionless, and can read how to define it as a quotient between resistance's. What you get, 0.59493791 and 1.77363368 are not fake ohms, as you type. Are the relation between the Platinum electric resistance and the reference value for the water at 0.01 Celsius. It is very practical because it is very easy to obtain temperatures of 0 C and 100 C with enough accuracy in the work area inside the plant, without having to disassemble the instrument and take it to the workshop workbench. It is PT100 because 100 ohms, otherwise it would be called PT1. You can google it. Actually there are also PT1000, whose nominal resistance is 1000 ohms at 0 CBest regards.Alvaro.
 uni #83 Posted : 04 May 2022 11:05:09(UTC) Rank: Advanced MemberGroups: Registered, Advanced MemberJoined: 10/11/2010(UTC)Posts: 1,324Was thanked: 1157 time(s) in 668 post(s) To be clear, I don't have permission to ban users. Until now this has not been necessary, except for the usual spammers. Yes, I can ask Andrey about it personally, but only in extreme cases. The current case is borderline. I don't have time to follow everything that happens on the forum. I could delete all posts that are not related to the topic of the forum, but this is inefficient. Thus, if you want to change something, then you will have to jointly develop proposals, coordinate them with Jean and report the result to Andrey. I think this is a more civilized way. Russia ☭ forever Viacheslav N. Mezentsev
 fedeghi #84 Posted : 04 May 2022 11:11:43(UTC) Rank: Advanced MemberGroups: Registered Joined: 14/09/2013(UTC)Posts: 87Was thanked: 22 time(s) in 15 post(s) Yes Uni, I understand and agree with your statement, I also think it is a waste of time to "regulate" this at an admin level.On the other hand, since it is unlikely that we can change Jean's mind and way of thinking, I will personally stop interacting and simply ignore what happens.Nevertheless, it should be noted that the forum will keep getting polluted and the "search" feature (which would be a very important feature of any technical forum...) is impacted.
 Jean Giraud #85 Posted : 04 May 2022 15:39:22(UTC) Rank: GuestGroups: Registered Joined: 04/07/2015(UTC)Posts: 6,132Was thanked: 896 time(s) in 724 post(s) You are both right, Smath Community is on the decline of Poisson Distribution.@ fedeghi 0.25% statistics, little chance of productive whatever collaboration.Take care ...
 Jean Giraud #86 Posted : 04 May 2022 16:32:21(UTC) Rank: GuestGroups: Registered Joined: 04/07/2015(UTC)Posts: 6,132Was thanked: 896 time(s) in 724 post(s) Originally Posted by: Razonar Actually there are also PT1000, whose nominal resistance is 1000 ohms at 0 CThere are even more SPRT [25.5 Ω] ... others fit in mother board.TP water 0.01 °CPlease, make the attached as you think it should be.Publish for the benefit of the Smath Community.Take care Alvaro ... Jean. Inst_Type Pt100 BIPM Copy.sm (397kb) downloaded 3 time(s).