Flow meters stop being read as they approach 500Hz

[kjkoster]

Dear All,

We have a few flow meters that run at 500Hz for full flow. From our experiments, flow is reported properly until we get close to the maximum 500Hz. Then, the counter stops incrementing although there is still flow.

We also have a U1000 flow meter, running up to 200Hz for 200l/min. That works fine across the whole range, adding to our suspicion that the communication between the DUK's and the RevPi breaks down as the frequency approaches the advertised maximum.

The flow meters are DUK-1xx8 and DUK-1xx9's. They are connected to pins on a RevPi DI module, which is set to counter mode (rising edge). The DI module's inputs are rated at 2000Hz, so I imagine a 500Hz input signal should not be a problem.

What can I do to also register the pulse count at frequencies closer to 500Hz?

Kees Jan

[kjkoster]

Dear All,

A quick check with an external power supply and an oscilloscope shows that this problem is with the flow meter, not with the Revolution Pi.

Kees Jan

[nicolaiB]

Thanks for the update, Kees!