Turbine flow meter calculations ?

[centurions123]

i am using an omega turbine flow meter in my experiment and i would like to know how i could convert the electrical signals produced by it(and acquired by DAQ) to useful readings in terms of flow rate.......since this is my first time using such meters any help would be appreciated

 

[BigInch]

Count the output pulses.
Those are proportional to the number of turns of the meter.
Multiply by volume of fluid passed per turn
Correct the standard density of the fluid for actual pressure and temperature
Result is mass of product moved through the meter.

**********************
"Pumping accounts for 20% of the world’s energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies)

http://virtualpipeline.spaces.live.com/

 

[ione]

centurions123,
You’ve already received a valid response from BigInch, and would like just to add that turbine meters are also quite sensitive to fluid viscosity. Being usually calibrated with water, you need particular care when dealing with fluids with higher viscosity, as this leads to less accuracy, if any measure is taken.

 

[centurions123]

I have uploaded the data that i collected using the flow meter.The problem is i do not know he density of the syngas that is produced in the experiment and i cant interpret the electrical output that the DAQ has acquired.

I dont quite get the idea how to measure the pulses and the volume flow thru per turn,since that is wat i want to measure.

 

[BigInch]

I assume you have something like the FTB700, so

http://www.omega.com/pptst/FTB700.html

See the K-factor in the manual.

http://www.omega.com/Manuals/manualpdf/M1966.pdf

You should probably contact the factory for detailed advice.



**********************
"Pumping accounts for 20% of the world’s energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies)

http://virtualpipeline.spaces.live.com/

 

[eadwine]

I agree with "Biginch" on this one. Check the manual and with Omega. Normally, on instrumentation loops, the breakdown is, Flowmeter (turbine in this case) with pulsed output, Flow Transmitter converts the pulsed output to an instrument signal (4-24ma or voltage/digital output) to the DCS system, Flow Indicator/totalizer output either on the board or is datalogged in the DCS with an output/outputs to various control elements within the Loop, Indication may also be just local without any control functions. Much of the time, the FT is integral to the Flowmeter and the manual or manufacturer will be able to tell you how to get this data into the DAQ so that it can be manipulated.

 

[nhliew]

BigInch is on the dot about flow measurement, but I suggest to refer to your project spec if the syngas need to be reported/displayed on mass basis. If it doesn't, you do not require the density.

By the way, did anybody notice that the FT readings come out below zero? That looks normal to you?

 

[BigInch]

I noticed, but didn't really want to get into data collection and if its spinning backwards, or are +/- terminals reversed, etc. ???

**********************
"Pumping accounts for 20% of the world’s energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies)

http://virtualpipeline.spaces.live.com/