flow measurement

[t29]

hi,

    iam working on a data aquisition project. so i have to measure flow rate of air , water and fuel(petrol) of an internal combustion engine. Can any one please tell me which daq device to use from these - ni 9219, ni 9234, ni 9403, ni cdaq 9172 ?

[Shreyas]

Can you tell what output you are getting from the flowmeters?

Also tell the specifications!