UroBoros
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This part I understood. Please Suggest few vendors, links or models suitable for this purpose.sensor+controller+rs485 interface ---the reqd units.
Pulse counter method is cheapest then use signal conditioning to filter out noise into parallel ports or latch the pulse and clear it when selected by MUX for as many as you need as fast as required.
In short form> characterise pulse width> design matched filter for best EMI impulse rejection with Transient suppression.> drive edge sensitive FF or dual NAND gates on each pulse and clear when pulse is read in to PISO register. (parallel in , serial out) then Mux data. Use a check pulse on last channel that toggles or has some Serial data for MUX integrity check.
How would you use air ultrasonic transducers to measure water flow in a tube?Why not use Ultrasonic sensors like US-020 which can detect 700 cm (7 meters)
can you refer some links for this M Bus Enabled options?In Europe, you would most likely refer to M-BUS enabled water meters, either wired or wireless, an existing standard for electronic meter readout.
to check water flow output on a Culligan "adoucisseur"**broken link removed**
Thanks , but not English.A litle MCU (PIC12F1840) interface the sensor and send the info via bluetooth
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