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Anonymous Poster #1

Rosemount 5300 Level Transmitter

08/16/2015 5:48 AM

Good afternoon guys,

We have installed some rosemount 5301/5302 guided wave level transmitters in our dew point control unit of gas processing plant. The issue is these level transmitters are mismatching with the lavel gauges which one installed at the level transmitters premises and some times the transmitters value is drifting and going beyond the setpoint level and this cause some unwanted tripping of the unit. Also one KTek (MW05XX) level transmitter also placed in this unit and that also giving same problem.

Anyone can explain that why this happening and what is the mitigation plan for this?

Advance thanks for your valuable feedback.

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#1

Re: Rosemount 5300 level transmitter

08/16/2015 7:24 AM

No, you should be the one explaining to us the problem. So, how was it now?

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#2
In reply to #1

Re: Rosemount 5300 level transmitter

08/16/2015 7:30 AM

Yes it is working normal at this time, this drifting problem is happening some times only.

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#3
In reply to #2

Re: Rosemount 5300 level transmitter

08/16/2015 8:03 AM

Oops, you bust your cover garuda777- you forgot to click "post anonymously

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#4

Re: Rosemount 5300 Level Transmitter

08/16/2015 3:14 PM

>Also one KTek (MW05XX) level transmitter also placed in this unit and that also giving same problem.

You don't provide the technology that the Ktek uses (bouyancy float? magnetostrictive? mechanical?) but I assume that it is not guided wave radar (GWR).

When two different technologies provide the same level reading, it is highly likely that the level is in fact doing what the level instruments say is happening - some sort of process upset is changing the level.

Why do you think that both level indicators are faulty, both showing the same change, in the same direction?

>his drifting problem is happening some times only.

And what process events are occurring (maybe upstream) at the same time as the drift that could cause a change in level?

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#5
In reply to #4

Re: Rosemount 5300 Level Transmitter

08/16/2015 5:07 PM

GA. And Good Questions.

It is a bit hard to understand his post, but I take it that he is comparing against some "lavel level gauges", which are usually liquid filled to provide hydraulic dampening. It may be the process needs some work, or he may just need to electrically/programatically dampen the transmitters.

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#6

Re: Rosemount 5300 Level Transmitter

08/17/2015 8:35 AM

I've quite a bit of experience with tank level measurement as nearly every process skid I do control for has at least one tank. Now I need a lot more information. Tell me about the tank. Flat bottom, dished, whatever. Straight wall length, material of construction and so on. At what point is the glitch occurring. Always at the same level. /at various times and levels. What is the liquid you are measuring? Where are the sensors installed in relation to the side wall. Is there a mixer involved? MORE DETAILS - please.

The fact you have 2 sensors, both of which appear on a quick check to be guided wave, I suspect the environment, not the sensors.

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Anonymous Poster #1
#9
In reply to #6

Re: Rosemount 5300 Level Transmitter

08/28/2015 12:59 PM

Phys could you send your contact email then i will send documents and trends.

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#10
In reply to #9

Re: Rosemount 5300 Level Transmitter

08/28/2015 1:01 PM

No. We'll discuss the topic right here - or not discuss at all.

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#11
In reply to #6

Re: Rosemount 5300 Level Transmitter

09/14/2015 5:25 AM

Dear Phys,

Better we can go one by one. Two float type level transmitters are connected on the Glycol / condensate separator vessel's boot portion. These transmitters are not matching with the level gauge. some error is always there.

I tried to attaced some drwings but I couldn't. The tank body is carbon steel.

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#12
In reply to #11

Re: Rosemount 5300 Level Transmitter

10/27/2015 2:36 PM

Floats and radars use two different methods for level measurement. Floats are density based and radars are not. Radars send down a microwave signal and get a bounce back from the surface. The float may or may not be floating at the top of the surface as it depends on the design of the float and what specific gravity it was designed to float at. I would suspect that the float is not quite accurate and the radar is more so. If there is a consistent difference between the readings, you could put in a offset so that they match. If the differences vary, I would suspect that you may have density variations in your process.

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#7

Re: Rosemount 5300 Level Transmitter

08/17/2015 9:44 AM

Not sure what type of level gauge the application is using.

If they are standard pressure gauge systems do not forget to factor the specific gravity of tank fluid into the level readings.

As for deviation in the guided wave transmitters: Reflection from fluid disturbances such as agitation, bubbles, and/or introduction of more fluid near the guided wave sensor will cause issues.

I suggest you contact Emerson-Rosemount Technical Support and have them analyze the application.

Your Rosemount sales representative should be more than willing to help solve the issue.

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#8

Re: Rosemount 5300 Level Transmitter

08/17/2015 10:51 AM

Haha! I used to build these for Rosemount...

Also one KTek (MW05XX) level transmitter also placed in this unit and that also giving same problem.

Have you replaced the level gauges to see if that solves your mismatch issue?

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#13

Re: Rosemount 5300 Level Transmitter

01/02/2025 2:50 PM

Not without knowing about the fluid, its temperature, pressure, and what's in the vapour space above the liquid level, no.

Not without knowing something about the size of the vessel, its inlet and outlet connections, no.

Not without knowing something about the vessel's internal structures and fittings, no.

The best thing to do is arrange site visits from the local <...rosemount...> and <...KTEK...> representatives.

The telephone is the quickest method of approach.

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