Liquid Flow Sensor, Turbine Meter

Description

Water flow sensor is mainly made ​​of a plastic body, the flow of the rotor assembly and the Hall sensor. Which is mounted at the inlet end of the heater, for detecting a water flow, when the flow of water through the rotor assembly, and the speed of rotation of the rotor with a magnetic flow change, a pulse signal corresponding to the Hall sensor output, the feedback to the controller, the control is to determine the size of the water flow regulation.

• 1/2” DN15 NPS fit, easy to add into common pipe size. About NPS see wiki explanation here.
• Transparent design, can also see the flow inside visually
• Red VCC, black GND, yellow frequency signal type
• Signal type: NPN square frequency
• Voltage supply: 5-24VDC, current 15mA (@ 5VDC)
• Size 54(Length)*25(1/2”) mm
• Very rigid plastic, quality is good.
• impeller has embedded metal ball to against wearable
• Sealed side can prevent water leakage into the circuit, circuit is separated from water.
• High quality internal hall sensor, glue sealed to against wearable
• Withstand pressure: 1.75Mpa, temperature and humanity range: ≤80℃ and 35%～90%RH
• Standard XH2.54 connector as you can see
• liquid medium should not be over 120 degree.

Calculation:

• Sensing range: 1-30L/min, 300 pulse = 1 liter water.
• Frequency, pulse number = F=5*Q(L/Min)*T-3
  • in which Q is the unit flow volume, liter per meter, T is the time, 5 and 3 is the constant value
  • for example, 5 * 1 liter * 60 sec – 3 =300 pulse
  • precision is ±2%

Post about how to use it with ESP8266 wifi via NE555 here.

Additional information