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Community, I'm experimenting with a program where I need to convert a pulsed flow meter signal into GPM. No big deal, right?! Here's the catch: the turbine style flowmeter is calibrated at 1 pulse per gallon. The well flows right around 60 GPM 24/7. There is a self contained totalizer at the site now that is "jittery" in it's GPM indications. I already know all the ways I could count pulse or measure frequency and factor my way to GPM. With a range of 0 to 100 GPM at 1 pulse/gallon what is the best way? The shorter the sampling period the higher the multiplication factor and the poorer the instantaneous resolution becomes. A 1000mS sampling with about a pulse per second has a resolution of nearly plus/minus 60 GPM ? which is not so useful. Doubt that changing the flow meter to a unit with pulsed and 4 to 20 mA is in the cards. I have a feeling I have answered my own question already with the laws of physics. Any comments, ideas, or remarks are welcome. Sincerely, -HW
Hello, first please accept my apology for my bad english. I`m using SB 13, which should do a pulse everytime SB 3 rises (every second). I`m increasing value by INC function block by positive transition contact of SB 13. Works well for like a minute and then it starts increasing around 50 values per second. It lasts for around 5 seconds and then it goes back to normal. When I`m watching online test and this situation happen, the ---[P]--- of SB 13 starts flashing a lot. Joining my VisiLogic project. (there are unconnected nets and timers, please, don`t give it attention) Thanks in advance for quick reply. Best regards, Martin Půta V280-2016_15_5 (1).vlp