03-06-2018 04:17 AM
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.
As I understand right I have got 2 outputs in quadrature and the output voltage = voltage apply -1. So, I will have to provide power source between 10V-28V. If I will go for 10V I would get 9V output voltage. Is it possible to use NI9215 or NI9375 to acquire and properly calibrate the signal?
Regards,
Gregorian7
03-07-2018 01:51 AM
Hi Gregorian,
This sounds like you are still figuring out the correct hardware configuration for your set-up.
In order to make a recommendation we would need to look much deeper into your application and specification (also think about channel count, accuracy, sampling frequency, do you need to expand in future etc.)
I believe our technical sales team would be the best address to help you and it is best if you give a call to your local NI office.
Andreas
03-09-2018 06:09 PM
Between the two modules you mentioned, the 9375 is the more appropriate choice since it's a mixed digital I/O module and not an analog input. I have never used an AI module for a flow meter application; I suppose it's possible, but it would seem mismatched, especially since analog sampling modules are typically a little more expensive.
The 9375's digital logic ON state is specified in the datasheet as >=10V, so 9V would not be within spec, and you would probably want it slightly higher than the 10V since the input impedance ratings are +/-5% tolerance resistances. I would find a way to increase the voltage or find a more flexible module, then start building your tick count algorithm from there.