USN-HS06PA-2 6mm Hose Barb End Water flow Sensor 0.2-2.5L/min 1% Error Ideal for Drinking Machin Hot Water Heater Coffee Machine    24V:can work with 5-26.4V input voltage.    Model: USN-HS06PA-2    Calculation Formula: F(Hz)= 48*flow rate(Q)(l/min)    Application:    Water heater, washing machine, boiler, electromagnetic water heater, water dispenser, water purifier, R.O. machine, U.F. machine, coffee machine, water machine, water machine control, water control machine, beer machine, beauty equipment, shower equipment, electrolytic water machine, energy engineering, heat pump,IC meter, steam equipment, irrigation equipment, water system, campus card self-service sale (sell) water machine, washing machine, automatic washing equipment, water treatment equipment, water dispensing equipment, cooling system, circulation system, intelligent toilet (toilet), bidet, mechanical equipment, heating equipment,  Pharmaceutical (agents) equipment etc.    Calculation Formula: see above.    Features:    1.       Food grade POM (polyformaldehyde) material, environmental friendly material, small, flexible and functional.    2.       Intubation design of inlet and outlet pipe, easy connection and operation;    3.       Imported Hall IC from Japan, stable and reliable;    4.       Flow Range: see above    5.       Working voltage: DC3.3-26.4V;     6.       Rated voltage and current: DC24V; no more than 10mA.    7.       Output voltage(rated: DC24V); High level 23.5V and above; low level 0.5V and below    8.       Pulse output duty cycle: 50+-10%    9.       Insulation resistance: 100M Ohm and above;    10.    Tightness: Seal up all the holes, and inflate with 0.8MPa water, after 1 minute, no leakage and deformation;    11.    -20-60 centigrade;    12.    Working Pressure: under 0.8Mpa;    13.    Electrical Strength: AC500V 50Hz.     14.    Wire length: regular  32cm, other length can be tailor made against request.    15.     End connection: SM2.54 Plug .          Note:    1.  When  magnetic material is close with  the sensor,its characteristics may vary.  2.  In order to avoid particle debris, the sensor must beinstalled after a filter.  3. The flow sensor installation  has to avoid strong vibration and shaking of the  environment, so as not to affect the sensor's measurement accuracy.