# Analog / Digital Converters for Weight Measurement

J

#### John Kelley

Hi All,

I'm working on a project wherein a client needs to certify some parts based on oil flow rate through up to 16 orifices. All the oil is pressure injected from one port and flows (distributes) oil through the 16 different ports. They've built a jig that allows them to pressurize the part and weigh oil that flows
through each cavity.

They want to automate the process by using load cells (which they already own) to process a 0-10vdc signal and calculate oil flow (as a percentage of, say port 1,2,4,5). I think a A/D converter will work for this with some software
that will "snapshot" weights of oil on the loadcells during a particular interval.

Flow measurement may be a confusing way to describe it, however. What they really want to do is insure that, for example, port 1 recieves 2.67% while port 4 recieves 5.99% and that everything is proportional within spec.

Any suggestions of a good A/D package that will help or do I buy a standard A/D board and use VB or the like? They definitely want to use a PC to record this info for archival purposes, so it's the preferred platform.

Thanks,

John Kelley

G

#### Gary

The lowest cost route to this would be to use the LabJack U12 USB data acquisition unit at $99. It is an 8-channel unit, but you can use 2 to get your 16 channels. It comes with free data logging software, or you can use LabView. Even cheaper, and better still is the new DAQLAb software at$125. Relevant web addresses are "www.labjack.com":http://www.labjack.com , "www.daqlab.com":http://www.daqlab.com .

Gary

C

#### Chris

Hi john,
i've worked in the industrial control industry for about 14 years and have just stumbled across