The Sensors Float Switch FH-402 is a high-precision, cost-effective magnetic float level sensor specially engineered for liquid level monitoring and automatic control. Designed for long-term stable operation in water treatment and drainage environments, this vertical float switch adopts a mature magnetic reed switch sensing principle, delivering accurate and repeatable level detection with an accuracy of ±3.2 mm. Built with rugged, corrosion-resistant housing materials, the FH-402 model features a fully sealed waterproof structure to prevent liquid and dust infiltration. It supports both standard fixed-point level control and personalized customized modifications, perfectly adapting to diverse tank and pipeline working conditions. As a core level control component for water industry scenarios, it enables automatic start-stop of water pumps and liquid level alarm output, helping users realize intelligent and unmanned liquid level management.
Product Features
High Detection Accuracy & Repeatability
Equipped with high-sensitivity magnetic reed switch components, the FH-402 float switch achieves precise liquid level detection with an error of only ±3.2 mm. It maintains consistent and stable switching actions during long-term reciprocating operation, avoiding frequent misoperation and ensuring reliable real-time monitoring of liquid level changes.
Fully Sealed & Corrosion-Resistant Design
The whole machine adopts integrated hermetic sealing technology, with no internal exposed electrical components. The non-magnetic engineering plastic and stainless steel housing resist water corrosion, oxidation, and dust accumulation, adapting to long-term submerged and humid working environments in water treatment systems.
Long Service Life & Low Maintenance
Adopting non-contact magnetic induction triggering, the switch has no mechanical friction and wear during operation. It supports millions of stable switching cycles, effectively reducing equipment failure rates and later maintenance costs, realizing maintenance-free long-term operation.
Strong Compatibility & Easy Integration
The sensor outputs standard switch signal, which is compatible with most industrial control systems, PLC controllers, water pump control panels and alarm devices. It supports automatic liquid level control, overflow alarm and dry-run protection functions, meeting diverse automatic control demands of water supply and drainage systems.
Working Principle
The GEM Sensors Float Switch FH-402 operates based on the principle of buoyancy and magnetic induction. The device consists of a movable magnetic float and a fixed internal reed switch installed inside the non-magnetic sealed stem. When the liquid level rises or falls, the buoyancy of the liquid drives the magnetic float to move vertically along the sensor stem. When the float reaches the preset high or low liquid level position, the internal permanent magnet of the float will trigger the hermetically sealed reed switch inside the stem, changing the on-off state of the circuit. This electrical signal change is transmitted to the control system to realize automatic functions such as starting and stopping water pumps, triggering level alarms, and cutting off power protection, achieving closed-loop automatic control of liquid level.
Product Parameters
|
Parameter Item |
Technical Specification |
|
Product Model |
FH-402 |
|
Detection Principle |
Magnetic Reed Switch Induction |
|
Detection Accuracy |
±3.2mm |
|
Working Voltage |
DC 5V-24V |
|
Max Switching Current |
0.5A |
|
Working Temperature |
-20℃ ~ +80℃ |
|
Protection Grade |
IP68 |
|
Housing Material |
Engineering Plastic / 304 Stainless Steel |
|
Switch State |
Normally Open / Normally Closed (Optional) |
|
Service Life |
≥1,000,000 Cycles |
Application Fields
The FH-402 GEM Sensors Float Switch is professionally optimized for water supply, drainage and water utility systems, and is widely used in various water level monitoring scenarios in the water industry. It applies to municipal water supply plants, sewage treatment plants, reservoir water level monitoring, water tank and pool level control, building domestic water supply and drainage systems, industrial wastewater treatment, and rainwater collection systems. It can effectively monitor and control the liquid level of clean water, domestic sewage and low-corrosive industrial water, providing reliable sensing support for automatic water supply, sewage discharge, overflow protection and water shortage anti-dry protection of water utility equipment.
Installation Method
The FH-402 float switch supports vertical top installation as the standard installation method, which is simple and fast with high stability. Before installation, confirm the installation position according to the preset liquid level control point, and fix the sensor on the top of the water tank, water pool or equipment through the reserved mounting hole. Ensure the sensor stem is vertically downward and the magnetic float can move up and down freely without obstruction. After penetrating the mounting hole, fix the sensor with a matching sealing gasket to ensure overall waterproof and tight performance. Complete wiring connection according to the control circuit requirements, and test the floating and triggering sensitivity of the float. In addition, it supports customized side mounting and fixed bracket installation to adapt to special equipment and space limitations.
Customizable Options
1. Structural Customization
Support customized probe length, float size and installation bracket size to adapt to different tank depths and equipment installation spaces, meeting non-standard installation size requirements of special water treatment equipment.
2. Electrical Parameter Customization
Customizable switch state (normally open/normally closed), working voltage range and wire length, matching different industrial control equipment and circuit system parameters.
3. Material Customization
Optional 316 stainless steel, enhanced anti-corrosion plastic and other housing materials, adapting to corrosive water quality such as chemical wastewater and high-hardness water, expanding application scenarios.
Why Choose Us
Stable & Reliable Performance: Adopting mature magnetic induction technology and fully sealed design, it adapts to complex water working conditions, with high detection accuracy and ultra-long service life, avoiding frequent equipment replacement.
Cost-Effective & Low Maintenance: The non-contact operation design eliminates mechanical wear, with low later maintenance cost and high comprehensive cost performance, suitable for large-scale popularization and use in water industry projects.
Strong Scene Adaptability: Standard products meet conventional water supply and drainage demands, and customized services solve special working condition pain points, covering all water level monitoring scenarios of water utility systems.
Professional After-Sales Support: We provide one-stop services including product selection guidance, installation guidance, technical support and after-sales warranty, with professional technical teams to solve customers' on-site application problems in real time.
FAQ
Q: What working environments is the FH-402 float switch suitable for?
A: It is mainly applicable to water supply, drainage and water utility systems, suitable for clean water, domestic sewage and low-corrosive industrial water. The working temperature ranges from -20℃ to 80℃, with IP68 waterproof grade, supporting long-term submerged operation.
Q: Can the product support customized parameters and sizes?
A: Yes. We support full customization of probe length, float specification, wire length, switch state and housing material, and can design exclusive products according to customers' on-site working conditions.
Q: What is the service life of the float switch?
A: The product adopts non-contact magnetic induction triggering without mechanical friction. The service life can reach more than 1 million switching cycles, realizing long-term maintenance-free operation.
Q: Is the installation of the FH-402 float switch complicated?
A: The standard vertical top installation is simple and fast, with no complicated debugging steps. We also provide detailed installation manuals and professional remote guidance to ensure normal use of the equipment.
Q: Is the switch signal compatible with conventional control equipment?
A: Yes. It outputs standard on-off switch signal, which is widely compatible with PLC controllers, water pump control boxes, alarm devices and other conventional industrial control equipment, with simple wiring and convenient integration.
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