Which Type of Mass Flow Meter Should I Buy?

Paresh,

The material that you are measuring will determine the type of flowmeter that is best for your application. Is it a liquid or gas and is it corrosive or abrasive. What accuracy will you require? The accuracy will affect the flowmeter cost by orders of magnitude for a small change. If you can live with +/- 1%, don't pay for +/- 0.1%. Also decide whether you are interested in accuracy or repeatability. Accuracy is a property of the meter from the factory. Repeatability is from on site calibration at a particular flow rate.

Dave

What is the fluid in the flowmeter?

I am going to use helium gas from 8 bar to 22 bar pressure in pipe size either with 1/4" or 3/8" with flow temperature range from 10 degree C to 40 degree C. Typical mass flow range expected to measure is 0.5 gm/sec to 2 gm/sec.

Paresh,

Wonderfully benign material!

This is the darling of flow metering. There is nothing you couldn't use.

What accuracy or repeatability do you require? You could go from a very cheap differential pressure type to a very expensive positive displacement type, with many possibilities in between.

Dave

I would tend towards one of the coriolis effect meters that are available from many manufacturers.

Thanks, I am also thinking about the same. Thank for clearing my doubts. Can you tell me how much it costs?

I am unsure on cost, but for that small could be between US$3000 and $10000.

You asked for a specific recommendation.

Siemens FC Mass 2100, specifically designed for metering low mass flow rates.
7.2Kg/ hour is well within its limits.
It's available world-wide.

This is the sensor that is plumbed into the pipe, it requires a separate converter/transmitter for the data signal outputs

A spec sheet available here:

http://www.automation.siemens.com/mcms/infocenter/dokumentencenter/sc/pi/Documentsu20Catalogs/sitransf_fcmass2100di15_fi01en.pdf