BDD ZJ-B7 G1/2 Brass Hall-Effect Water Flow Sensor 1-25L/min 5-15V

The ZJ-B7 G1/2 Water Flow Sensor is a durable Hall-effect water flow meter designed to accurately measure the flow rate of clean water in residential, commercial, and industrial applications. Constructed with a solid brass body, it offers superior durability, higher pressure resistance, and a longer service life than plastic flow sensors.

As water flows through the sensor, an internal rotor spins and the integrated Hall-effect sensor generates a series of digital pulse signals proportional to the flow rate. These pulses can be read by Arduino, ESP32, Raspberry Pi, PLCs, and other microcontroller platforms for precise flow monitoring, liquid dispensing, automation, and water consumption measurement.

Operating over a flow range of 1 to 25 litres per minute, the ZJ-B7 delivers reliable performance with an NPN pulse output and supports operating voltages from 5V to 15V DC. Its standard G1/2" threaded connection makes installation simple for water dispensers, coffee machines, irrigation systems, water purifiers, industrial equipment, and smart water monitoring projects.

Features

• Part Number: ZJ-B7
• Solid brass construction for excellent durability
• Hall-effect water flow sensing technology
• Standard G1/2" threaded connection
• Measures flow from 1 to 25 L/min
• Digital NPN pulse output
• Compatible with Arduino, ESP32, Raspberry Pi and PLCs
• High pressure resistance up to 1.75MPa
• Suitable for water temperatures up to 120 C (electronics perform best below 80 C)
• Accurate pulse output proportional to flow rate
• Easy three-wire interface

Specifications

• Part Number: ZJ-B7
• Device Type: Water Flow Sensor
• Sensor Technology: Hall-Effect
• Body Material: Brass (Copper Alloy)
• Connection Size: G1/2" Thread
• Flow Rate Range: 1-25L/min
• Operating Voltage: 5-15V DC
• Minimum Start Voltage: 4.5V DC
• Output Type: NPN Pulse Square Wave
• Duty Cycle: Approximately 50%
• High Output Level: 4.7V (at 5V supply)
• Low Output Level: 0.5V
• Pulse Formula: F = 11 × Q (Hz)
• Accuracy: 3% to 5%
• Maximum Pressure: 1.75MPa (253 PSI)
• Maximum Fluid Temperature: 120 C
• Recommended Electronics Temperature: Below 80 C

Wire Connections

• Red: VCC (+5V to +15V DC)
• Black: GND
• Yellow: Pulse Output (NPN)

Applications

• Water flow measurement
• Smart water monitoring systems
• Water dispensers
• Coffee machines
• Water purification systems
• Irrigation controllers
• Industrial automation
• Liquid dispensing equipment
• Arduino and ESP32 projects
• Raspberry Pi and PLC-based monitoring systems

Installation Notes

• Install the sensor with the flow following the direction of the arrow on the housing.
• Fit a mesh filter upstream to prevent debris from damaging the impeller.
• Avoid installing the sensor near large motors, transformers, or strong magnetic fields to ensure accurate Hall-effect measurements.
• Use clean water only for optimum performance and sensor longevity.

What's in the box
1 x BDD ZJ-B7 G1/2 Brass Hall-Effect Water Flow Sensor 1-25L/min 5-15V