capacitance type level transmitter

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Anonymous Poster	capacitance type level transmitter 03/29/2009 1:42 PM
	hello friends , we have capacitance type tansmitter Mfgd : Endress & Houser which set to hi hi lvl trip past days, we have spurious trip initiation due to this transmitter when we open the chamber we found lot of carbon dust around the chamber and around the probe . as this is install on knockout drum of fuel gas we find clean service when look into the sight glass my question Does the carbon dust affect the measurement ? or is possible of probe vibration due to flow through chamber which touch the chamber side ? or any other way of tripping .
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jack of all trades Guru Join Date: Sep 2006 Location: Auckland, New Zealand Posts: 8777 Good Answers: 376	#1 Re: capacitance type level transmitter 03/29/2009 7:31 PM
	It sounds like you are getting carbon dust sticking or building up around the sensor head causing a capacitance change and therefore a false trip. Is the sensor head clean and flush with the surrounding surface? Do you have any cavities or overhanding surfaces on or near the sensor head where dust may be building up? Have you used the correct sensor for your application (is it designed to work in your application)? __________________ jack of all trades
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RHABE Guru Join Date: Dec 2006 Location: Germany 49° 26' N, 7° 46' O Posts: 1950 Good Answers: 109	#2 Re: capacitance type level transmitter 03/30/2009 2:20 AM
	This carbon dust will have a (limited) electrical resistance and if low enough then playing havoc with the very low currents used in capacitive transducers and the non-isokated electrodes of these. If resistance is really high, then the dielectric of carbon may play the same yoke to your sensor. RHABE
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EElectrician Power-User Join Date: Aug 2008 Location: KY, USA Posts: 367 Good Answers: 18	#3 Re: capacitance type level transmitter 03/30/2009 4:57 PM
	If you have a part number you can download a manual and find out if the sensor is listed as corrosion resistant. If you are looking for an alternative we use Endress & Hauser Liquiphant M FTL51C "vibration-type" level limit switches. These sensors are not analog, but they are very reliable and corrosion resistant. They are used at my facility in a process that handles chemicals like Boric acid. I have never had to replace one, and they get covered with all sorts of gooey nasty stuff in our liquid chemical waste systems. I do get a little "bounce" in the electrical signal (probably do to splashing liquids) which is easily resolved with a 0.75 second timer. __________________ The most valuable of all talents is that of never using two words when one will do. ~Thomas Jefferson
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SakthiND Participant Join Date: Oct 2011 Posts: 2	#4 In reply to #3 Re: capacitance type level transmitter 12/01/2011 7:41 AM
	HI, ivetel also having capacitance Type Level Transmitter and Capacitive Type Level Sensor/switch. For your problem go for vibration-type level limit switches. this one is very reliable and corrosion resistant. For more details Plz visit www.ivetel.com
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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	#5 Re: capacitance type level transmitter 11/11/2022 5:37 AM
	A1) yes. A2) yes. A3) the composition of the fluid has changed since the instrument was first commissioned. Changes in fluid composition affect the permittivity characteristic of the fluid, which in turn affects the capacitance that the instrument "sees" for the same level, which affects the signal that is transmitted from it. What does <... Endress & Houser...> have to say over the phone? __________________ "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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