When To Use NAMUR Standard In A Switch?

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Abiegay Participant Join Date: Mar 2014 Posts: 2	When To Use NAMUR Standard In A Switch? 03/03/2014 3:22 AM
	Good day! I'm currently working on a float switch data sheet. Our project requires NAMUR output for switch but the vendor cannot provide it. But as per vendor product data sheet, their float switch have an approval for explosion protection. Is it ok if the switch does not have a NAMUR output? Thanks!
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JohnDG Guru Join Date: May 2006 Location: Reading, Berkshire, UK. Going under cover. Posts: 9684 Good Answers: 468	#1 Re: When to use NAMUR standard in a switch? 03/03/2014 4:08 AM
	If your project requires NAMUR output (i.e. if it's written into a contract), then NAMUR you must provide. __________________ "Love justice, you who rule the world" - Dante Alighieri
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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	#2 Re: When To Use NAMUR Standard In A Switch? 03/03/2014 5:30 PM
	What class/type of explosion protection, please? __________________ "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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Abiegay Participant Join Date: Mar 2014 Posts: 2	#3 In reply to #2 Re: When To Use NAMUR Standard In A Switch? 03/03/2014 5:47 PM
	ATEX II2G (Gas Zone 1) Ex d
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SUBRAHMANIAN Active Contributor Join Date: Jan 2014 Posts: 12	#4 Re: When To Use NAMUR Standard In A Switch? 03/04/2014 1:03 PM
	Normally NAMUR switches are two-wire switches which are mainly used in explosive areas. They normally produce very low current out put, that is in either <1 mA or >2.2 They are mostly preferred in places we need intrinsic safety, where in these switches/Sensors will be connected to plc/DCS via barriers.
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instruguy72 Active Contributor Join Date: Feb 2012 Posts: 11 Good Answers: 1	#5 Re: When To Use NAMUR Standard In A Switch? 03/11/2014 12:26 PM
	If you are going to use NAMUR output ensure that you have an amplifier or input that is specifically designed for low level switching current. Most of the DCS /PLC can handle NAMUR inputs , but still check with vendor if you need amplifier. Now whether NAMUR is required or not , you need to check with your client. Is it only required for this particular switch or for all instruments that are located in hazardous area?
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