Near Intersection of I-35 & I-90 Southern Mn. | Yes, you have an early Micro Trak sensor that just uses two wires. The newer one use 3 wires.
Yours does not use a circuit board so just use the ground (braid) and the signal wire. The power wire will not be used. Cap or protect it so that it doesn't short out to something.
The newer Micro Trak flow meter sensors use a Hall effect sensor which requires power so all three wires would be used.
Your flow meter has a turbine inside it that spins due to the flow. The turbine has magnets on it. These magnets pass close to a glass cylinder which houses the reed sensor. The sensor is utter simplicity. It consists of a pair of metal contacts which due to their springy nature do not touch each other. One is connected to ground and the other to the signal line which the controller is attempting to hold at 5VDC. When the magnet on the turbine passes closely by the capsule, the magnetic field pulls both of the metal reed contacts to the outside of the glass cylinder. They touch and the signal line is then pulled to ground. Once the turbine turns a bit further, the magnetic field no longer holds the reed together and they move apart from each other. The signal line is no longer connected to ground and returns to 5VDC. This creates a pulse.
The spray controller or monitor watches for these pulses and counts them. It uses a meter cal number that you enter to convert these pulses into familiar units such as gallons.
Remember to plumb the flow meter so that all the flow that goes through it gets to the ground. If you have any branches for agitation or control that send product back to the tank make certain that is done prior to the flow meter.
One might think that shorting the signal line to ground would cause damage but such is not the case since a pullup resistor is involved. It behaves much like the small spring on an old baler counter. Once the lever is pushed and released, the spring brings it back to its home position. Without the spring, the counter might or might not return to the home position.
Edited by tedbear 4/3/2025 12:15
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Question on wiring 2 wire Micro Trak Flow Meter to EZ-Boom
