1.Introduce

The SAIER Passive Water Flow Sensors employs advanced Wiegand sensor technology, leveraging a dual magnetic pole triggering mechanism to detect water flow. As water passes through the flow meter, the sensor is activated to generate and output electrical signals. The frequency or pulse count of these signals is directly proportional to the water flow rate, enabling highly accurate measurement and recording of actual water consumption.

The key benefit of this design is its “passive” operation—meaning it can function reliably without any external power supply. This simplifies installation and maintenance, eliminating the need for additional wiring or power sources. It also allows for real-time water flow monitoring, providing precise data for end-users and water management systems. This makes it an ideal solution for smart water management, energy-saving bathrooms, and high-reliability metering applications.

2. Basic parameter

Parameter	Specification
サイズ	G3/4” Female Thread
素材	真鍮
Operating Temperature	-10°C to 60°C (avoid freezing)
Power Mode	Passive, No external power needed
Flow Range	4-45 L/min
Working Pressure	≤1.75 MPa
Wiring	200mm USB cable (±10mm)
Instantaneous Pulse Frequency (Hz), Q (L/min)	F = (6Q – 3) ±10%

Instant pulse characteristic:

Signal:

3.Core Differences Between Hall Effect Flow Sensor and SAIER SEN-HZ43NC Passive Flow Sensor

Comparison Item	Hall Effect Flow Sensor	SAIER SEN-HZ43NC Passive Flow Sensor
Power Supply Mode	Requires external power (battery or wired)	No external power needed; water flow triggers Wiegand technology to generate pulses independently
Maintenance Cost	Frequent battery replacement or power line maintenance; susceptible to power failures	Zero maintenance; no power components, ensuring uninterrupted operation
Low-Flow Performance	Signal affected by magnetic field change speed; less accurate at near-zero flow	Signal amplitude independent of flow speed; reliable detection at very low flow rates
Ease of Integration	Needs matching power modules, voltage regulation, or converters	Simplified signal processing; can directly connect to transistors, comparators, or long-distance transmission lines
Safety & Environmental Tolerance	Include electronic components	No mechanical contacts or sparks; avoids electric leakage risk in humid bathroom scenarios; strong adaptability to bathroom environment

4.Why choose a passive water flow sensor?

Passive water flow sensors, such as those utilizing Wiegand technology, offer numerous advantages for water metering and monitoring:

• Self-powered, Zero Energy Consumption: These sensors generate electrical pulses (approximately 10μs) intrinsically from water flow, requiring no batteries or external power sources. This simplifies installation, reduces maintenance costs, and ensures continuous operation without power failures.
• Reliable Performance at All Flow Rates: Signal amplitude is independent of magnetic field change speed, enabling accurate detection even at near-zero flow conditions.
• Easy Integration: The simple signal output can be directly connected to transistors, comparators, A/D converters, and other electronic components, streamlining system integration.
• Support for Remote Monitoring: The generated signals can be transmitted over long distances via signal lines, making them ideal for LAN-based management systems—crucial for smart water networks.
• Safety and Durability: With no mechanical contacts or sparks, these sensors are intrinsically safe, suitable for hazardous environments. Their wide operating temperature and environmental adaptability ensure long-term, stable performance under diverse conditions.

In summary, passive water flow sensors combine efficiency, reliability, and cost-effectiveness, making them an optimal choice for modern, smart water management solutions.

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