Temperature Design Standard DIN -43763

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Kruti Associate Join Date: Oct 2014 Posts: 25	Temperature Design Standard DIN -43763 06/25/2015 2:40 AM
	CAN ANY ONE PLS. SHARE THE STANDARD DIN 43763 (IN ENGLISH). I NEED TO VERIFY IF THE STANDARD PROVIDES ACCURACY OF +/-0.01 OHMS. VENDOR IS OFFERING TEMPERATURE DESIGN STANDARD IEC - 751 FOR RTDS WHERE THE ACCURACY PROVIDED IS 'CLASS A' I.E +/- 0.06 OHMS IS IT POSSIBLE TO HAVE +/-0.01 OHMS OF ACCURACY FOR RTD'S?
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Tornado Guru Join Date: May 2009 Location: Richland, WA, USA Posts: 21017 Good Answers: 795	#1 Re: TEMPERATURE DESIGN STANDARD DIN -43763 06/25/2015 3:32 AM
	Shouting does not help. __________________ In vino veritas; in cervisia carmen; in aqua E. coli.
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Randall Guru Join Date: Aug 2005 Location: Hemel Hempstead, UK Posts: 5826 Good Answers: 322	#2 Re: TEMPERATURE DESIGN STANDARD DIN -43763 06/25/2015 6:33 AM
	Most RTDs have a nominal resistance of between about 100Ω and 1KΩ, and have accuracies from about ±0.1% to ±5%. Surely it's the % accuracy rather than the absolute accuracy which is relevant. What are you trying to do? __________________ If you spend all your time looking for people and things to complain about: trust me, you will find plenty to complain about.
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Kruti Associate Join Date: Oct 2014 Posts: 25	#3 In reply to #2 Re: TEMPERATURE DESIGN STANDARD DIN -43763 06/25/2015 6:51 AM
	It is 0.01 ohms. Vendor is providing accuracy of CLASS -A for RTD's according inline to standard IEC as i mentioned earlier. whereas client is asking for 0.01 ohm accuracy, i guess this accuracy shall be as per DIN 43763 which i need to check if the same is possible for RTD's
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PWSlack Guru Join Date: Jan 2007 Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on. Posts: 32175 Good Answers: 839	#4 In reply to #3 Re: TEMPERATURE DESIGN STANDARD DIN -43763 06/25/2015 12:46 PM
	Google DIN 43763. There are so many copies out there that some people will be selling them just to get rid of them. Bootleg copies just expose the originator to the wrath of copyright laws, so don't ask again. Do turn off the Caps Lock. Lower case writing with correct capitalisation is far more exact, and nowhere near as rude. __________________ "Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
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Randall Guru Join Date: Aug 2005 Location: Hemel Hempstead, UK Posts: 5826 Good Answers: 322	#5 In reply to #3 Re: TEMPERATURE DESIGN STANDARD DIN -43763 06/25/2015 2:51 PM
	There is what looks to me like quite a good guide to specifying RTDs here http://www.smartsensors.com/specrtds.pdf Does the vendors part have a part code and/or data sheet. I'm still a bit perplexed by a demand for 0.01Ω accuracy: you could put a hundred 100Ω RTDs with 0.1% accuracy in parallel and beat that easily, but, what would it achieve? __________________ If you spend all your time looking for people and things to complain about: trust me, you will find plenty to complain about.
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Iris Guru Join Date: Jul 2010 Posts: 669 Good Answers: 176	#6 Re: TEMPERATURE DESIGN STANDARD DIN -43763 06/25/2015 10:55 PM
	The ±0.01 ohms is known as 1/10B or sometimes 1/10 DIN tolerance class. I don't know whether that IEC standard covers that tolerance class or not. To some extent, it doesn't matter, what matters is what you can source for your customer and these 'high accuracy' RTDs are not every day production items. So you need to contact your RTD vendor and see what they can do. The once or twice I've run into this, a discussion revealed that the customer had no idea of the limited temperature range over which the 1/10B tolerance covered (0-100°C) and eventually opted for an AA tolerance band with a transmitter loaded with the specific response characteristics of that particular RTD. But it depends on what your vendor can offer. Find out, get a ball park price and delivery, then go back to the specifier and say, "is this what you really expected?"
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Iris Guru Join Date: Jul 2010 Posts: 669 Good Answers: 176	#7 Re: TEMPERATURE DESIGN STANDARD DIN -43763 06/26/2015 8:13 AM
	The use of tolerance classes has confused lots of people. The use a percentage number leads people to believe that the number is "uncertainty percent full span" (it isn't; it's percent resistance error at base resistance only) or that it is temperature uncertainty. Reotemp has a very good tutorial/explanation of tolerance classes and their relationship to accuracy. www.reotemp.com/pdf/TBRTDTOL-0614RTDToleranceClasses.pdf
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