Introducing the FH-504 Pipeline Liquid Level Sensor, a robust solution engineered for real-time monitoring of liquid presence within tubing. Unlike traditional mechanical float switches, this optical sensor detects liquid levels without moving parts, ensuring zero leakage risk and long-term durability. The sensor features a T-shaped structure with quick-connect pipe joints, allowing for easy integration into various fluid paths. It outputs a voltage signal directly proportional to the liquid level, which can be read by an MCU's A/D port to calculate flow rate or volume. Built to last with a 50,000-hour lifespan, it operates reliably in temperatures ranging from -20℃ to 80℃.

Product Features
Compact Pipeline Design: T-shaped structure with integrated pipe connectors for easy in-line installation and minimal space requirements.
High Reliability: Solid-state optical detection eliminates mechanical wear, providing a maintenance-free solution with a 50,000-hour lifespan
Wide Voltage Range: Operates stably on 3.0V to 5.5V DC, making it compatible with a variety of microcontroller systems.
Robust Protection: Features an IP67 rating (per datasheet mechanical specs) and can withstand pressures up to 100 kPa.
Working Principle
This sensor operates on the principle of infrared optical refraction (not Hall effect, but used for similar flow/level monitoring purposes).
Signal Emission: An infrared LED inside the sensor emits light.
Medium Detection:
No Liquid (Air): When the pipeline is empty, light reflects internally, resulting in a High Voltage output (>2.8V).
Liquid Present: When liquid enters the pipeline, it changes the refractive index, causing light to refract into the liquid. This results in a Low Voltage output (<0.5V).
Flow/Level Calculation: The MCU reads this voltage change via an A/D port to determine flow status or liquid volume.

Product Parameters
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Application Fields
This versatile sensor is the perfect choice for applications demanding precise fluid management:
Smart Coffee Machines: Detects water levels in brewing chambers to prevent overflow or dry firing.
Medical Analyzers: Ensures accurate reagent delivery and prevents air bubbles in sensitive diagnostic equipment.
Water Purification Systems: Monitors filter status and detects leaks or dry running in RO pumps.
Industrial Automation: Used in chemical dosing pumps and coolant circulation systems for safety interlocks.
Installation Method
For optimal performance, please follow these installation guidelines:
Cut the Pipe: Cut the tubing at the desired monitoring point.
Connect: Insert the tubing into the sensor's inlet and outlet barbs (ensure a tight fit).
Secure: Use cable ties or clips to secure the sensor body if necessary.
Wiring: Connect the wires according to the color code (Typically: Red/VCC, Black/GND, Signal/AD).
MCU Connection: Connect the Signal wire to the MCU's A/D (Analog to Digital) input port to read the voltage level.
Customizable Options
To meet the differentiated pipeline specifications, water quality conditions and system matching needs of different water treatment and environmental protection projects, we provide comprehensive personalized customization services:
1. Pipeline Interface & Structural Customization
Support customized pipe diameter, thread interface, installation fixing bracket and overall dimension, adapting to special pipeline layout and limited installation space of environmental protection engineering equipment.
2. Working Parameter Customization
Customize low-flow startup threshold, measuring range, pressure resistance and signal output frequency to adapt to special flow and pressure working conditions of sewage treatment, recycled water and other environmental protection scenarios.
3. Anti-Corrosion & Protection Customization
Provide upgraded anti-corrosion, anti-fouling coating and high-grade waterproof materials, support enhanced protection grade, suitable for harsh water quality and humid outdoor environmental protection working conditions.
Why Choose Us
Professional Environmental Protection Scenario Optimization We fully understand the harsh working conditions of water treatment and environmental protection industries such as easy fouling, corrosive water quality and long-term continuous operation. Our products are specially optimized for industry pain points, with far better stability and durability than ordinary universal sensors.
High Cost-Performance Factory Direct Supply As a source manufacturer, we eliminate intermediate links and provide competitive factory prices. On the premise of meeting high environmental protection industry standards, we ensure stable product quality and help customers reduce overall procurement and operation costs.
Reliable Quality & Comprehensive After-Sales Service We provide 18-month long-term warranty and lifelong technical support. The professional technical team provides one-on-one installation guidance, parameter debugging and after-sales problem solving to ensure stable operation of customer environmental protection equipment and projects.
Global OEM/ODM Customization Support We support personalized OEM/ODM services such as exclusive logo customization, structural optimization, parameter adjustment and packaging customization, meeting the diverse supporting needs of global environmental protection equipment enterprises and engineering projects.
FAQ
Q1: Is this a Hall Flow Sensor?
A: No, the PCFS-IR2125A-55 is an Optical (Infrared) Liquid Level Sensor. While it can be used for flow detection by monitoring liquid presence, it does not use the Hall effect principle.
Q2: What is the output signal type?
A: It outputs an Analog Voltage Signal. The voltage level changes based on whether liquid is present (<0.5V) or absent (>2.8V). This signal is typically read by an MCU's A/D port.
Q3: What is the operating voltage range?
A: The sensor operates on a wide voltage range from 3.0V to 5.5V DC.
Q4: Can it withstand high pressure?
A: Yes, the sensor has a pressure resistance of up to 100 kPa, making it suitable for most pump-driven fluid systems.
Q5: What is the response time?
A: The sensor has a fast response time of 100 mS, ensuring real-time detection of liquid flow changes.
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