How to log the duty cycle of the valve in flow meter?

Fourth pin counting from the gauge side, if you turn the RJ connector over like you are plugging it into the controller that would be pin 5 on your drawing.

If you physically look into the RJ port on the controller and count 4 from the gauge side that's the one.

[5mall5nail5]

Ok I still don't really understand "gauge side" but if its pin 5, I can deal with that. I am going to wire the white/blue wire as the flow meter conditioned signal.

[Richard L]

Here is the correct signal for the flow sensor:

Pin #5 (blue/white) = calibrated flow sensor signal .........~0.5V to ~4.5V

[5mall5nail5]

Got it working Richard thanks! Although its somewhat of an arbitrary value to log, I can see that the W/I is turning on and going.

You can put the system in test for one minute and measure the fluid sprayed while logging the voltage. This will give you a correlation of voltage to flow. Depending on how ambitious you are, you can map a few points and then have some data of what is going on.

Just remember, if you change the SC position on the gauge you will need to re-calibrate.

[Richard L]

Originally Posted by 5mall5nail5

Got it working Richard thanks! Although its somewhat of an arbitrary value to log, I can see that the W/I is turning on and going.

The main aim of flow montoring is to detect flow anormalies rather to inform absolute flow. The SC allows users to normalise the flow across the 8 bars of display.

It works like a temperature gauge or tank level gauge on a dash board. The actual cc/min is not the primary objective. That said, Jeff suggested calibrating the sensor to display absolute flow if you want to construct your own failsafe strategy on your ECU.

It is posssible to extract the raw signal from the sensor pulse/sec and make your own "frequancy to voltage" decoder for your logger. This way you can have both.