Greeting all,
We have alot of magnetic flow meter from Rosmount.( Bad support after sales)
Really now have alot of issues on reading and malfunction on these instruments
Now we are looking for another technology and rectacrable option if there for example ultrasonic flowmeter
Kindly advise us on the best solution for our problem.
Thanks,

 

Fluid composition solids content, etc., installation, including pipe size.
Summary if issues encountered, and frequency of re-occurance.

Please explain why you are seeking a retractable design, since inline measurement are used in the original design.

 

We use Emerson magnetic flow meter on product line of RO UNITS
Because this very critical and to replace the device need to shutdown the unit
And we are facing issue on reading is not correct and some time not stable.
For that i am looking to another type retractable if there ,so can be replace the sensor with unot shutdown and also need to be the instument is accurate.

 

Is the RO treatment so good that the processed water does not have enough conductivity for the proper operation of the installed magmeter?

The Siemens mag flowmeter spec sheet on my desk states it needs a minimum 10uS/cm conductivity.

 

Is the RO treatment so good that the processed water does not have enough conductivity for the proper operation of the installed magmeter?

My thought as well, we have used mass flow meters in the past instead of mag flow to avoid this problem with very clean RO water

 

Our Ro water tge conductivity is above 10 , and no issue on that
Only our isdue with the reading and lining .
And if need to replace the sensor you need to shitdown the unit.
Also the replacment not easy .
So , i see many models of ultrasonic flow meter tube but i dont know can be possible replace the sensor ehen the unot is running without shutdown,
Also the chalange the accuracy.

 

Most RO I've run into has far less conductivity, 0.05-5uS, so you must be dealing with some 'dirty' water to start with. Is the 'dirty' water contributing to the lining problem. What is the lining problem?

Yes, there are insertion magmeters with an insertion/extraction valve assembly available.

I pulled up an ABB insertion magmeter (arbitrary choice). Minimum conductivity is 50uS/cm. My experience is that most major players have very similar specs, so be aware that insertion magmeters are not as sensitive as in-line mag meters.

My vague recollection is that the stated accuracy for insertion magmeters is not as good as in-line magmeters.

Flow profile counts more with an insertion meter than with an in-line flow meter.

 

A flow meter will be as accurate as its specification sheet, as long as it is installed as required. Piping before and after mag flow typically requires straight pipe for 5 pipe diameters upstream and 3 down. For insertion mag flow you need to check insertion length is correct. Ultrasonic is all external to the pipe so no lining to wear out, again needs to be installed as required and application needs to be suitable, no significant air bubbles or solids for time of flight ultrasonic.