Water flow sensor (OT3229)

The YF-B2 water flow sensor is small in size and easy to install. The sensor is mainly composed of a plastic valve body, a water flow rotor assembly and a Hall sensor. It is installed at the water inlet end of the gas boiler to detect the water flow.
Technical Specifications:

Working voltage range: DC 5～18V
Minimum rated working voltage: DC 5V
Maximum working current: 15mA (DC 5V)
Load capacity: ≤ 10mA (DC 5V)
Operating temperature range: ≤80 ℃
Application humidity range: 35% to 90% RH (without frost)
Allowable pressure resistance: Water pressure below 1.75 Mpa
Storage temperature: -25 ～ +80 ℃
Storage humidity: 25% ～ 95% RH
Liquid temperature max: 120°C

Connecting wiring:
JST connector
Red wire: IN Yellow wire: OUT Black wire: GND
Output specifications:

Output pulse high level: > DC 4.5V (input voltage DC 5V)
Output pulse low level: < DC 0.5V (input voltage DC 5V)
Fine output (Flow -- pulse output): 1～ 25L/min ±3 %
Output pulse duty cycle: 50±10%
Output rise time: 0.04 μS
Output fall time: 0.18 μS
Flow - pulse characteristics: Horizontal test pulse frequency (Hz)=[ 11* Q]± 5 % (horizontal test) (Q is flow rate L/min)

Environmental resistance:

Impact resistance: The product is well packaged and shows no abnormality when freely dropped from a height of 50cm in the X, Y, and Z directions to the concrete surface. Accuracy varies within 5%.
Insulation resistance: The insulation resistance between the Hall sensor and the copper valve body is more than 100 MΩ. (DC 500V)
Heat resistance: in an environment of 80±3℃ for 48 hours, return to normal temperature for 1-2 hours without abnormality, and the parts have no cracks, relaxation, expansion, deformation and other phenomena, and the accuracy changes within 10%.
Cold resistance: in -20±3℃ environment for 48 hours, return to normal temperature for 1-2 hours without abnormality, and the parts have no cracks, relaxation, expansion, deformation and other phenomena, and the accuracy changes






Eight, flow --- pulse characteristics refer to the table F=11*Q




flow


pulse


error


min


max


flow


pulse


error


min


max




2


22


± 1,020


22.44


21.56


6.1


67.1


±3.2


68.44


65.76




2.1


23.1


± 1.021


23.59


22.64


6.2


68.2


±3.3


69.56


66.90




2.2


24.2


± 1.022


24.68


23.72


6.3


69.3


±3.4


70.69


67.91




2.3


25.3


±1.023


25.83


24.79


6.4


70.4


±3.5


71.81


69.06




2.4


26.4


±1.024


26.93


25.87


6.5


71.5


±3.6


72.93


70.07




2.5


27.5


±1.025


28.08


26.95


6.6


72.6


±3.7


74.05


71.22




2.6


28.6


±1.026


29.17


28.03


6.7


73.7


±3.8


75.17


72.23




2.7


29.7


±1.027


30.32


29.11


6.8


74.8


±3.9


76.30


73.38




2.8


30.8


±1.028


31.42


30.18


6.9


75.9


±3.10


77.42


74.38




2.9


31.9


±1.029


32.57


31.26


7


77


±3.11


78.54


75.54




3


33


±1.030


33.66


32.34


7.1


78.1


±3.12


79.66


76.54




3.1


34.1


±1.031


34.82


33.42


7.2


79.2


±3.13


80.78


77.70




3.2


35.2


±1.032


35.90


34.50


7.3


80.3


±3.14


81.91


78.69




3.3


36.3


±1.033


37.06


35.57


7.4


81.4


±3.15


83.03


79.85




3.4


37.4


±1.034


38.15


36.65


7.5


82.5


±3.16


84.15


80.85




3.5


38.5


±1.035


39.31


37.73


7.6


83.6


±3.17


85.27


82.01




3.6


39.6


±1.036


40.39


38.81


7.7


84.7


±3.18


86.39


83.01




3.7


40.7


±1.037


41.55


39.89


7.8


85.8


±3.19


87.52


84.17




3.8


41.8


±1.038


42.64


40.96


7.9


86.9


±3.20


88.64


85.16




3.9


42.9


±1.039


43.80


42.04


8


88


±3.21


89.76


86.33




4


44


±1.040


44.88


43.12


8.1


89.1


±3.22


90.88


87.32




4.1


45.1


±1.041


46.05


44.20


8.2


90.2


±3.23


92.00


88.49




4.2


46.2


±1.042


47.12


45.28


8.3


91.3


±3.24


93.13


89.47




4.3


47.3


±1.043


48.29


46.35


8.4


92.4


±3.25


94.25


90.64




4.4


48.4


±1.044


49.37


47.43


8.5


93.5


±3.26


95.37


91.63




4.5


49.5


±1.045


50.54


48.51


8.6


94.6


±3.27


96.49


92.80




4.6


50.6


±1.046


51.61


49.59


8.7


95.7


±3.28


97.61


93.79




4.7


51.7


±1.047


52.79


50.67


8.8


96.8


±3.29


98.74


94.96




4.8


52.8


±1.048


53.86


51.74


8.9


97.9


±3.30


99.86


95.94




4.9


53.9


±1.049


55.03


52.82


9


99


±3.31


100.98


97.12




5


55


±1.050


56.10


53.90


9.1


100.1


±3.32


102.10


98.10




5.1


56.1


±1.051


57.28


54.98


9.2


101.2


±3.33


103.22


99.28




5.2


57.2


±1.052


58.34


56.06


9.3


102.3


±3.34


104.35


100.25




5.3


58.3


±1.053


59.52


57.13


9.4


103.4


±3.35


105.47


101.44




5.4


59.4


±1.054


60.59


58.21


9.5


104.5


±3.36


106.59


102.41




5.5


60.5


±1.055


61.77


59.29


9.6


105.6


±3.37


107.71


103.59




5.6


61.6


±1.056


62.83


60.37


9.7


106.7


±3.38


108.83


104.57




5.7


62.7


±1.057


64.02


61.45


9.8


107.8


±3.39


109.96


105.75




5.8


63.8


±1.058


65.08


62.52


9.9


108.9


±3.40


111.08


106.72




5.9


64.9


±1.059


66.26


63.60


10


110


±3.41


112.20


107.91



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