Подключал его так, к 24v,красный провод +, чёрный -, жёлтый к 2 входу.
Вот это нанисано в инструкции
Waterproof,Heat resistance,pressure resistance,cold resistance.
Easy to install.
Frequency: F=26 * Q (L / Min) error: ± 2% voltage :3.5-24VDC, current can not exceed 10mA, 450 output pulses/liters,
F=onstant * units of flow (L / min) * time (seconds).
Flow range:1-30L/min
Interior diameter:1.5mm,external diameter:6mm(G1/4")
Minimum rated working voltage dC4.5 5V-24V
Maximum current:15 mA(DC 5V)
Working voltage range dC 5?18 V
Load capacity:≤10 mA(DC 5V)
Operating Temp:≤80?,Operating humidity:35%?90%RH
Allow compression:Water pressure 1.75 Mpa below
Storage Temperature:-25?+80?
Storage humidity:25%?95%RH
Output Waveform:Square Wave,output pulse singal.
ROHS Compliant.
Cable length:15cm.
Wiring:Red Connect Positive;Yellow OUT Connect signal output;Black GND Connect Negative.
Application:water heater thermostat, water purifier, boiler, water dispensers, coffee machines, smart card equipment, the boiler and so on.
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