Labview flow meter display

[Aquaman89]

Hi all, 

I have an aquamaster S flow meter with its programming cable, meaning I could change the max. frequency, number of pulses/unit, FSD % etc. I tried writing a program where the labview would take the voltage and convert it to a flow rate. I'm not sure what I'm doing wrong but I could never get the flow rates to match. I tried playing around with the pulses/unit and max frequencies and somehow manage to get a fairly close number but the minute I change the flow rate through the system the flow rate in labview goes all over the place. The range of voltages I get from the meter are 1.5V to 5V. The maximum flow rate I'm expecting in my system is 2.6lpm. 

Please help !

Here is the link to the flow meters program menu in case anyone wants to check it out: 

http://www05.abb.com/global/scot/scot203.nsf/veritydisplay/70da9c6555f9305580256f020025d79d/$File/IM_AMS_QRG_5.pdf

[StephanieA]

How are you trying to convert the voltage to a flow rate? Can you post your code so we can take a look at it?

[Ben]

---

@Aquaman89 wrote:

Hi all, 

I have an aquamaster S flow meter with its programming cable, meaning I could change the max. frequency, number of pulses/unit, FSD % etc. I tried writing a program where the labview would take the voltage and convert it to a flow rate. I'm not sure what I'm doing wrong but I could never get the flow rates to match. I tried playing around with the pulses/unit and max frequencies and somehow manage to get a fairly close number but the minute I change the flow rate through the system the flow rate in labview goes all over the place. The range of voltages I get from the meter are 1.5V to 5V. The maximum flow rate I'm expecting in my system is 2.6lpm. 

Please help !

Here is the link to the flow meters program menu in case anyone wants to check it out: 

http://www05.abb.com/global/scot/scot203.nsf/veritydisplay/70da9c6555f9305580256f020025d79d/$File/IM_AMS_QRG_5.pdf

---

Are you sure you widget is giving you an analog signal?

Many of the flow meters I have worked with gave me pulses* that I counted to track the flow rate.

Ben

* the interanal cap at the input of a instrumentation amp could be filtering the pulses but because the cap discahrges non-linearly, when you change freq the scaling will be off.

[Aquaman89]

A colleague of mine was assigned to initially work on developing the labview program. I think he tried using multipliers to somehow adjust the flow rate in lab view but that didn't work.

Thank you for your time : )