Oil and water accurate dosage
Oil and water accurate dosage
(OP)
Hello!!!!
For an emulsification process we are feeding oil and water into a nozzle using two different gear pumps .
We are settng the dosage using frequency drive by calculating flow and output equivalent frequency. But there seems to be some error.
Is there any method of achieving more accuracy and less error maybe using a PID controller or something like that? So that the error could be made nil everytime .
Thanks
For an emulsification process we are feeding oil and water into a nozzle using two different gear pumps .
We are settng the dosage using frequency drive by calculating flow and output equivalent frequency. But there seems to be some error.
Is there any method of achieving more accuracy and less error maybe using a PID controller or something like that? So that the error could be made nil everytime .
Thanks





RE: Oil and water accurate dosage
How big is the error?
How big do you want it to be?
Mike Halloran
Pembroke Pines, FL, USA
RE: Oil and water accurate dosage
Good luck,
Latexman
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RE: Oil and water accurate dosage
Some error is acceptable about 2% .
Another reason might be the wearing of gears of the gear pumps we are using but they are fine for the application.
We calculate the flow like this -
currently we are using a 100 LPM gear pump connected to a frequency drive .
The motor is 1440rpm and frequency is 50hertz.
So, I move the drive to 25 hertz to get an output of 50 LPM and so on.
But, this is not highly accurate.
Maybe the picture is clear now.
Please suggest a way not too expensive of bringing down the error and also minimising manual interference.
RE: Oil and water accurate dosage
I.e., if it's not going ~1500 rpm at 50Hz, maybe you could use a motor with less slip. ... or a tach or encoder on the motor. What you can do in that area depends on the specifics of the motor and the controller. Since you have revealed squat about either device, it will be hard to offer more help.
Mike Halloran
Pembroke Pines, FL, USA
RE: Oil and water accurate dosage
What I want to do is place a flowmeter ahead of the pump with a transmitter .
The flowmeter should signal the flow to a controller which should make the error nil maybe by controlling the frequency drive .
Is there any other possible way wherein we could digitally set the flowrate and be able to achieve it.
I have less idea about automation being a mixer designer.please help
RE: Oil and water accurate dosage
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: Oil and water accurate dosage
Anyways, I think this should work and nil my headache.
Thanks!
RE: Oil and water accurate dosage
For a better accuracy you would need a oil in water analyzer. If you are mixing in a pipe you can measure the content of oil in water and close the loop. If you are mixing in a tank this probably will be very diffucult or impossible.
I know a company that is specialist in this type of blenders (Jiskoot). They are really good (and not cheap) and only competitive for big systems. Anyway they approach the problem like I explained above.
REgards,