YF-B1 YF-B2 YF-B3 BSP G1/2' Hall Flow Sensor Turbine Meter 1-25L/min Turbine Flow Meter Water Flow Sensor Model: YF-B1 Specifications: Interface size: 4 points (G1/2) Working voltage range: DC518V Inner diameter/outer diameter: inner diameter water inlet 15.4, water outlet 13.5mm/outer diameter 20.5mm Thread length: 9.3mm Water pressure resistance: 1.75MPa Output pulse high level: >DC4.7V (input voltage DC 5V) Output pulse duty cycle: 50%10% Insulation resistance: >100M Flow range: (at 125L/MIN)3% Tightness: Close each hole, add 1.7Mpa water pressure test for 1 minute, no leakage and deformation Pulse frequency: (Hz)=[ 11*Q ]5%(Q--flow L/min ) Model: YF-B2 Specifications: Interface size: 4 outer teeth for the water inlet, 4 inner teeth for the water outlet (G1/2) Working voltage range: DC5~18V Inner diameter/outer diameter: inner tooth inner diameter 20.8 outer tooth inner diameter 14.5/outer diameter 20.7 Thread length: 10.6mm Material: Copper Water pressure resistance: 1.75MPa Output pulse high level: >DC 4.7V (output voltage DC 5V) Output pulse duty cycle: 50%10% Tightness: Close each hole, add 1.7MPa water pressure test for 1 minute without leakage and deformation Model: YF-B3 Specifications: Interface size: 4 outer teeth for the water inlet, 4 inner teeth for the water outlet Working voltage range: DC518V Inner/Outer Diameter: 15mm/20.8mm Thread length: long teeth 18.5mm short teeth 10.5mm Material: Copper Water pressure resistance: 1.75MPa Output pulse high level: >DC4.7V (input voltage DC 5V) Output pulse duty cycle: 50%10% Insulation resistance: >100M Flow range: [at 125L/MIN]3% Tightness: Close each hole, add 1.7Mpa water pressure test for 1 minute, no leakage and deformation Flow pulse characteristics: (11*Q)Q=L/Min3% Wiring: Red IN is connected to the positive pole Yellow OUT signal output line Black GND to negative wire Package Included: Flow sensor*1