Absolute Pressure Transmitter

9 comments

Rate

Anonymous Poster	Absolute Pressure Transmitter 02/18/2011 2:54 PM
	I wanted to calibrate a absolute pressure transmitter,0 to 1500 mbar range,in normal condition its showing 1015 mbar .if I add 485 the ammeter showing 20 ma. How I can calculate the ma for 1000 mbar,900 mbar,and 500 mbar. Please help me.
	Reply

Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.

Ace Boeringa Guru Join Date: Mar 2006 Location: Washington USA Posts: 566 Good Answers: 53	#1 Re: absolute pressure transmitter 02/18/2011 3:15 PM
	In this case a 1500 mbar range is proportional to a 16 ma range (4-20ma) so 1000 mbar divided by 1500 mbar is two thirds (or 0.6667) and 16 ma multiplied by two thirds is 10.67 add 4 which is the 16ma current ranges offset from zero and you can see that 1000 mbar in should give 14.67 ma output.
	Reply

Bud Power-User Join Date: Jul 2010 Posts: 136 Good Answers: 19	#2 Re: absolute pressure transmitter 02/18/2011 3:34 PM
	Ace's procedure in arithmetic: [(mbar value/1500) * 16ma] + 4mA = mA at that mbar value
	Reply

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	#3 Re: absolute pressure transmitter 02/18/2011 3:35 PM
	0mbara = 4mA or 0mA? Whichever, once it's known, it's a simple arithmetical interpolation exercise to calculate the remainder. __________________ "Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
	Reply

lyn Guru Join Date: Oct 2008 Posts: 42355 Good Answers: 1693	#4 Re: absolute pressure transmitter 02/18/2011 6:48 PM
	Let me guess. Your dog ate the operators manual.
	Reply

cwarner7_11 Guru Join Date: Dec 2006 Location: Panama Posts: 4273 Good Answers: 213	#5 Re: Absolute Pressure Transmitter 02/18/2011 11:15 PM
	And what, in the original query, clued you in to the fact that the transducer does, in fact, have a linear response?
	Reply Off Topic (Score 4)

reefdiver Power-User Join Date: Apr 2007 Posts: 196 Good Answers: 2	#6 Re: Absolute Pressure Transmitter 02/19/2011 9:19 AM
	is it even possible to calibrate a device over that range ?
	Reply Score 1 for Off Topic

Bud Power-User Join Date: Jul 2010 Posts: 136 Good Answers: 19	#7 Re: Absolute Pressure Transmitter 02/19/2011 10:02 AM
	It seems that about 97% of the people using the word 'calibrate' on this forum mean - setting the upper range or lower range value - checking the transmitter's output value against 'something else'. Whether you or I would consider the 'something else' a traceable standard is questionable; in part because there's rarely, if ever, any dialogue with the OP beyond an initial query by a Guest. The real issue comes out with the question inquiring what a pressure's corresponding mA output value is. Very close to homework.
	Reply

bharat instrumentation Participant Join Date: Feb 2011 Posts: 2	#8 Re: Absolute Pressure Transmitter 02/21/2011 9:19 AM
	first check absolute pressure how much and use this formula:-add this your value showing reading (actual reading) - lower range divided by upper range - lower range after multiply by 16 and add 4 = you will get correct answer and if suppose you will not get value and transitter make zero trim from hart communicator
	Reply Off Topic (Score 5)

Anonymous Poster	#9 In reply to #8 Re: Absolute Pressure Transmitter 02/22/2011 10:14 AM
	Hi, all if you try to calibrate the xmtr and you don't know were to start, call the snr technician and will be able to help you on this problem? Or dial the vendor number ask them to do the job for you and get your boss to pay the service?
	Reply Off Topic (Score 5)

Copy to Clipboard

Ace Boeringa (1); Anonymous Poster (1); bharat instrumentation (1); Bud (2); cwarner7_11 (1); lyn (1); PWSlack (1); reefdiver (1)

You might be interested in: Pressure Gauges, Pressure Sensors, Pressure Switches

	Got Something to Say?
	Ask a Question Start a Discussion

	Aerospace
	BioMech & BioMed
	Chemical & Material Science
	Civil Engineering
	Communications & Electronics
	Education and Engineering Careers
	Electrical Engineering
	General Discussion
	Instrumentation
	Manufacturing
	Mechanical Engineering
	New Technologies & Research
	Software & Programming
	Sustainable Engineering
	Transportation

	Site Directories
	Forum Directory Blog Directory User Group Directory RSS Feeds CR4 Rules of Conduct CR4 FAQ Site Glossary Who's Online (55 right now) Show Members