Dear NAdeem,
OK now there is some clarity.
You have a pneumatic valve in a 1" pipeline handling 120 cu.lit of air ( per sec ? per min ? per hour ? ...) .
You want to remotely control the opening of this valve from your mobile phone.
If the above is correct then following options exist:
(Since this is a project to demonstrate the remote regulation with a WAP, you can just ignore aspects like response time, hysterisis, PID and such.)
1. Buy a standard proportional flow control valve + matched amplifier capable of handling your flowrate.
2. Install the valve in the pipe line.
3. Power up the matched amplifier card / or the built in electronics on the valve if that is the case.
4. Set up your NI card and link the AOT channel to the command input of the valve control electronics.
5. Send command to the PC from your mobile to control the valve.
This set up will be completely open loop. You just send the command to open by say 25% and hope that it happens. Don't worry, if there are no fundamental flaws, will work quite well. And will be adequate to prove your goal of remote opening of a valve.
Now if you want to make it closed loop ?
1. The basic setup is the same as above.
2. You need some feedback to know the flow rate. And for this you need a flow sensor.
3. COnfigure one more AIN channel like you did for pressure already.
4. Read this sensor output on your mobile.
5. You can then dynamically adjust the command TILL you get the required flow.
Just to give an idea how these proportional valves look, download a typical data sheet from here :
http://www.clippard.com/downloads/general/PDF_Documents/EVP_Proportional_Valve_Data_Sheet.pdf
Now you can search for similiar ones for your flow rate. keywords : pneumatic proportional flow controls
Hope that helped.
Raghunathan
Raghunathan
LabVIEW to Automate Hydraulic Test rigs.
