Flow Meter - programming.

[gregorian7]

Hi,

I'd like to read value from gear flow meter  (attached specifications - model type V2). I have never done it before that why I'm asking what is the best approach to program the code for this type of meters.

Thanks,

Gregorian7

[deceased]

Looks like 2 outputs in quadrature (so flow direction is known).

You can force the output to a certain voltage level by changing the supply voltage.

Easiest in my mind is to give 6V supply so the output is TTL level.

There are lots of hardware options for counting TTL level quadrature signals.

Edit: Sorry it looks like I misread the sheet, only 10V-28V available. With that in mind I would aim for 25V supply as 24V quadrature signals are also quite common.

Cant comment on the software until you pick the hardware.

0xDEAD

[gregorian7]

Hi,

I am still quite new to the LabVIEW.

I was planning to use NI 9375 and NI 9215.

Thanks,

gregorian7

[deceased]

Are you intending to use a cDAQ or CRIO?

I dont think you can use a 9375 as a counter input with a compact DAQ... So if thats the plan, best check that with NI before you buy.

It might be earier to buy/make some electronics to shift the level from HTL to TTL then use something like a 9401 to count with.

0xDEAD

[ikaiser]

Yes, asking NI directly is a good idea.

However, judging from the little information I read here I'd go for a NI-9421 or NI-9422 (24V Sinking/Sourcing Digital Input). It supports counters (did not check for quadrature but most likely it has) and works with CompactDAQ as well.