Water flow sensor (OT3229)

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

Technical Specifications:

• Operating voltage range: DC 5–18 V
• Minimum rated operating voltage: DC 5 V
• Maximum operating current: 15 mA (DC 5 V)
• Load capacity: ≤ 10 mA (DC 5 V)
• Operating temperature range: ≤ 80 °C
• Operating humidity range: 35% to 90% RH (without frost)
• Allowable pressure resistance: Water pressure below 1.75 MPa
• Storage temperature: −25 to +80 °C
• Storage humidity: 25% to 95% RH
• Fluid temperature max: 120 °C

Wiring:

JST connector

Red wire: IN
Yellow wire: OUT
Black wire: GND

Output Specifications:

• Output pulse high level: > DC 4.5 V (input voltage DC 5 V)
• Output pulse low level: < DC 0.5 V (input voltage DC 5 V)
• Flow—pulse output: 1–25 L/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% (Q is flow rate in L/min)

Environmental Resistance:

• Impact resistance: The product is well packaged and shows no abnormalities when freely dropped from a height of 50 cm in the X, Y, and Z directions onto a 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 500 V).
• Heat resistance: In an 80 ± 3 °C environment for 48 hours, then returned to normal temperature for 1–2 hours without abnormalities. Parts show no cracking, loosening, expansion, deformation, or other phenomena, and accuracy changes within 10%.
• Cold resistance: In a −20 ± 3 °C environment for 48 hours, then returned to normal temperature for 1–2 hours without abnormalities. Parts show no cracking, loosening, expansion, deformation, or other phenomena, and the accuracy changes