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Pulse frequency Vortex meter

Hi everyone,

 

I am trying to read the output (4-20mA pulse) of a vortex meter system to regulate an air flow rate.

The old system is using a display 415A.10E from contrec and the reading is working fine.

I am trying to read this same pulse signal with NI modules but I am stuck, after trying different solution none gave me a stable signal. 

 

I have two module I tried to use, NI-9361 and NI-9401.

Since it is my first time trying to read a pulse signal via labview I turn to you for pointers !

 

Can someone help me? How to configure the Daqmx routine? is there some special conversion needed? 

 

Thanks for your help

Yann

 

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