Previous in Forum: Level transmitter calibration range   Next in Forum: Partial Discharge Meter - Problem
Close

Comments Format:






Change Mode
Close

Subscribe to Discussion:

CR4 allows you to "subscribe" to a discussion
so that you can be notified of new comments to
the discussion via email.

Close

Rating Vote:







Add Vote
6 comments
Rate Comments: Nested
sanjiv77
Participant

Join Date: Oct 2008
Posts: 2

level measurement

10/20/2008 12:03 AM

I got a batch reactor (cc 1500 mmWC) which operates under vacuum and 4 kg/cm2 conditions for a chemical.

But the transmitter manufacturers recommond for DP level remote seal transmitters but of 80NB why is it so 40 NB sized flange d DPT should work what's your suggessions?

Regards,

sanjiv Patil.
Register to Reply
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.
PWSlack
Guru
United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

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
#1

Re: level measurement

10/20/2008 3:42 AM

On the basis of diaphragm area, an 80ø connection will be more accurate and therefore more easily available than a 40ø one.

__________________
 "Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
Register to Reply
Anonymous Poster
#2
In reply to #1

Re: level measurement

10/21/2008 12:42 AM

by how much? 40NB they mention accuracy around 0.07% and for 80NB 0.067% does it really matters?
Register to Reply
andrew_ward
Commentator

Join Date: Jun 2008
Location: Brick, NJ
Posts: 71
Good Answers: 8
#3
In reply to #2

Re: level measurement

10/21/2008 5:38 AM

You aren't as interested in the instrument accuracy as you are about the measurement accuracy. 1500 mmWC is around 2 psi and is a small measurement. A larger face will give you a more accurate measurement. Since pressure is a function of area, a larger area will multiply the force and gives the amplifier a better signal to noise ratio.

__________________
 Do this. Don't do that. Can't you redesign?
Register to Reply
sanjiv77
Participant

Join Date: Oct 2008
Posts: 2
#4
In reply to #3

Re: level measurement

10/21/2008 7:41 AM

when we are using DPT without Extended flange then same sensor has less accuracy that what you mean to say?

regards,

sanjiv
Register to Reply
andrew_ward
Commentator

Join Date: Jun 2008
Location: Brick, NJ
Posts: 71
Good Answers: 8
#5
In reply to #4

Re: level measurement

10/21/2008 6:22 PM

Yes, exactly. A larger surface area is more sensitive to small differences in pressure.

__________________
 Do this. Don't do that. Can't you redesign?
Register to Reply
Anonymous Poster
#6
In reply to #5

Re: level measurement

10/22/2008 12:11 AM

thanks

Regards,

sanjiv
Register to Reply
Register to Reply
Have a Different Question?
6 comments
Copy to Clipboard

Users who posted comments:

andrew_ward (2); Anonymous Poster (2); PWSlack (1); sanjiv77 (1)

Previous in Forum: Level transmitter calibration range   Next in Forum: Partial Discharge Meter - Problem

Advertisement

Got Something to Say?
Ask a Question
Start a Discussion

Search this Forum
Instrumentation:
Go

CR4 Sections
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 (87 right now)
Show Members
Advertisement