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Join Date: Oct 2010
Posts: 4

Level Transmitter Location for Closed Loop Vessel Affect Calc?

10/05/2010 11:29 AM

I have a level transmitter with a small range of 641mm that corresponds to a level glass on a bridle. I need to mount the transmitter at grade and the taps (located on the bridle) will be mounted above it. Will I have to take the transmitter being below its taps in consideration or is this when auto zero on the transmitter comes into play? The vessel is a KO drum operating pressure of 68.2 psi. I have found conflicting information on the web.

See page 2. www2.emersonprocess.com/siteadmincenter/.../00816-0100-3206.pdf

On page 2 it says the transmitter should be mounted at or below it's taps. In their below calc there isn't any reference to a dimension if the transmitter is mounted below it's lower tap.

Also, when is Auto-Zero function to be used?

Thank you,

Ariel

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Participant

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Posts: 4
#1

Re: Level Transmitter Location for Closed Loop Vessel Affect Calc?

10/05/2010 11:36 AM

I'm not sure why the link I attached isn't working.

http://www2.emersonprocess.com/en-US/brands/rosemount/Documentation-and-Drawings/Technical-Notes/Pages/index.aspx

and then select

Level Measurement (Technology: Pressure)

DP Level00816-0100-3206BA90

then see page 2

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#2

Re: Level Transmitter Location for Closed Loop Vessel Affect Calc?

10/05/2010 11:37 AM

The site address you've given is incomplete, and will not work. What is the make & model number of the transmitter?

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#3
In reply to #2

Re: Level Transmitter Location for Closed Loop Vessel Affect Calc?

10/05/2010 11:50 AM

It is a Rosemount 3051CD

If you google Level Measurement 00816-0100-3206. It comes up as the 2nd item on the page. Or click 'Level Measurement (Technology:Pressure)' in my last post.

Thank you,

Ariel

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#4
In reply to #3

Re: Level Transmitter Location for Closed Loop Vessel Affect Calc?

10/05/2010 12:00 PM

For the sealed system (figure 3 on page 2 of the datasheet (link)) it doesn't matter if (or how far) the transmitter is below the taps - the only thing that matters is the difference between the two pressures.

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#5
In reply to #4

Re: Level Transmitter Location for Closed Loop Vessel Affect Calc?

10/05/2010 12:20 PM

Actually, it isn't sealed. The fill fluid for the L side is Glycerin and then I have hydrocarbon/water mixture on H side. I didn't realize that seals would matter? Thank you.

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#6
In reply to #5

Re: Level Transmitter Location for Closed Loop Vessel Affect Calc?

10/05/2010 1:19 PM

Friend Ahughes31,

I was checking the paper 00816-0100-3206 Level Measurement from Rosemount and It is talking about transmitters with Remote Seal.

Are you sure that your 3051CD has remote seal?

or

it is only using tubing in order to get connect to the process taps

I suppose that according your past notes you are talking about a 3051CD without remote seal, and also you will be measuring interface between HC/water <----very important point (Interface measurement).

According your notes, I reccomend to install the transmitter in the same point of the bottom tap or below this.

And, fill the L side with glycerin in order to avoid possible problems created by condensate

I will be waiting your response in order to give more information

Please, put the complete serial of the 3051CD

Regards
JP

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