The FH-404 Magnetic Float Level Sensor is a high-precision, temperature-resistant liquid level detection device customized exclusively for the HVAC and refrigeration industry. Adopting mature magnetic reed induction technology, this vertical float sensor delivers stable and repeatable level monitoring for refrigerants, cooling water, glycol solutions and other heat exchange mediums. Optimized for long-term cyclic operation in heating, ventilation and refrigeration circulation systems, it features excellent temperature adaptability, low-temperature resistance and anti-condensation performance. With a fully sealed integrated structure, it effectively prevents water vapor infiltration and signal drift in humid and temperature-changing environments. Supporting standard fixed-point level control and personalized custom modification, the FH-404 solves liquid level monitoring and automatic control pain points for chillers, cooling towers, heat pump units and refrigeration storage equipment, ensuring safe and efficient operation of HVAC systems.
Product Features
Excellent Temperature Adaptability for HVAC & Refrigeration
Specially optimized for alternating cold and hot working conditions of HVAC systems, the FH-404 magnetic float level sensor stably operates in low-temperature refrigeration environments and normal-temperature heating circulation systems. It avoids signal failure and detection deviation caused by temperature fluctuation, perfectly adapting to refrigerant liquid level monitoring and cooling circulation medium control in refrigeration equipment.
Anti-Condensation & High Stability Operation
Adopting fully sealed waterproof and moisture-proof structure, the whole machine prevents internal condensation and vapor corrosion in humid HVAC working environments. The non-contact magnetic induction design eliminates signal drift and false triggering caused by equipment vibration and medium flow fluctuation, maintaining long-term consistent detection accuracy.
Compatible with Multiple Heat Exchange Mediums
The sensor housing is made of special medium-resistant materials, compatible with cooling water, glycol antifreeze solution, low-viscosity refrigerant and other common HVAC heat exchange mediums. It features low adsorption and strong corrosion resistance, no scaling or blockage during long-term use, adapting to diverse refrigeration and heating circulation systems.
Low Energy Consumption & Long Service Life
With no mechanical friction and wear during operation, the non-contact sensing mode supports millions of stable switching cycles. It features low power consumption, no daily maintenance required, effectively reducing the failure rate and operation cost of HVAC and refrigeration automation systems.
Working Principle
The FH-404 magnetic float level sensor operates based on liquid buoyancy and magnetic coupling induction principle. The device consists of a sealed non-magnetic probe and a built-in magnetic float, installed vertically inside HVAC and refrigeration equipment such as chillers, heat pumps and cooling water tanks. The magnetic float floats on the surface of heat exchange medium and moves synchronously with liquid level changes. When the medium level reaches the preset high or low threshold, the permanent magnet inside the float induces and triggers the internal high-sensitivity reed switch, realizing circuit on-off switching. The converted electrical signal is transmitted to the HVAC control system to achieve automatic functions including liquid level real-time monitoring, medium replenishment reminder, low-level protection and overflow prevention, ensuring closed-loop stable operation of refrigeration and heating circulation systems.
Product Parameters
|
Parameter Item |
Technical Specification |
|
Product Model |
FH-404 |
|
Product Type |
HVAC & Refrigeration Magnetic Float Level Sensor |
|
Detection Principle |
Magnetic Reed Switch Induction |
|
Detection Accuracy |
±2.0mm |
|
Working Voltage |
DC 5V-24V |
|
Max Switching Current |
0.5A |
|
Working Temperature |
-40℃ ~ +80℃ |
|
Protection Grade |
IP67/IP68 Optional |
|
Housing Material |
Food-Grade ABS / 304 Stainless Steel |
|
Applicable Medium |
Cooling Water, Glycol Solution, Refrigerant |
|
Switch State |
Normally Open / Normally Closed (Optional) |
|
Service Life |
≥1,000,000 Switching Cycles |
Application Fields
The FH-404 magnetic float level sensor is professionally optimized for HVAC and refrigeration industry scenarios, covering full-scene liquid level monitoring and automatic control demands of heating, ventilation, air conditioning and refrigeration systems. It is widely applied in central air conditioning chiller units, cooling tower circulation systems, heat pump heating equipment, industrial refrigeration units, cold storage refrigeration systems, HVAC water tank buffer systems, building ventilation heat exchange equipment and constant temperature and humidity air conditioning units. It stably monitors the liquid level of cooling circulating water, antifreeze glycol solution and low-temperature refrigerant, effectively preventing equipment dry running, medium leakage and insufficient circulation, ensuring stable energy-saving operation of HVAC and refrigeration systems.
Installation Method
The FH-404 magnetic float level sensor adopts top vertical installation as the standard method, which is compact, firm and suitable for most HVAC and refrigeration equipment tanks. Before installation, confirm the liquid level control range according to the equipment operation parameters, reserve standard mounting holes on the top of the chiller water tank, cooling tower or heat pump buffer tank. Vertically insert the sensor probe into the equipment, fix it with a special sealing gasket to ensure tightness and prevent medium leakage and vapor infiltration. Ensure the internal magnetic float moves up and down freely without collision or jamming with tank walls and internal pipeline structures. Complete wiring according to HVAC control system specifications, and test the liquid level triggering sensitivity and equipment linkage effect. It also supports customized side installation and threaded fixed installation for narrow-space refrigeration equipment.
Customizable Options
1. Structural & Size Customization
Support customized probe length, float size and installation thread specifications to adapt to different tank depths and installation aperture sizes of various HVAC and refrigeration equipment. Custom fixed brackets are available to solve the installation limitations of compact refrigeration unit structures.
2. Medium & Temperature Adaptation Customization
Aimed at special low-temperature refrigerants and high-concentration antifreeze solutions, customized high and low temperature resistant materials and medium-resistant structures are provided to adapt to extreme temperature working conditions of special refrigeration equipment.
3. Electrical & Signal Customization
Customizable wire length, switch state and output signal parameters, matching different brands of HVAC controllers and refrigeration unit control systems to realize seamless linkage and intelligent control.
Why Choose Us
Industry-Specific Optimization: Specially optimized for HVAC and refrigeration working conditions, with excellent cold and heat resistance, anti-condensation and medium compatibility, perfectly adapting to various heat exchange and refrigeration circulation systems.
Stable & Energy-Saving Operation: High-precision stable detection avoids equipment frequent start-stop and energy waste caused by level abnormality, helping HVAC and refrigeration equipment maintain efficient and energy-saving operation.
Low Maintenance & High Cost Performance: Non-contact wear-free design achieves long-term maintenance-free operation, reducing later equipment maintenance costs and downtime losses for HVAC engineering projects.
Professional Industry Customization & Support: Focusing on HVAC and refrigeration industry scenarios, we provide targeted product selection, installation guidance and after-sales technical support, solving various on-site application problems for industry customers.
FAQ
Q: What HVAC and refrigeration equipment is the FH-404 suitable for?
A: It is widely used in central air conditioning chillers, cooling towers, heat pump units, industrial cold storage refrigeration systems, constant temperature and humidity air conditioning units and supporting water tank circulation equipment, suitable for various conventional HVAC liquid level monitoring scenarios.
Q: Can it work stably in low-temperature refrigeration environments?
A: Yes. The product supports a wide temperature range of -40℃ to +80℃, with excellent low-temperature resistance and no signal drift in long-term low-temperature refrigeration working conditions, fully adapting to cold storage and low-temperature refrigeration equipment operation.
Q: Is the sensor resistant to glycol antifreeze and refrigerant medium?
A: Absolutely. The customized medium-resistant housing material is compatible with common HVAC heat exchange mediums such as cooling water, glycol antifreeze solution and conventional refrigerants, with no corrosion or scaling and long service life.
Q: Will condensation affect the sensor's detection accuracy?
A: No. The fully sealed moisture-proof structure effectively isolates internal condensation and water vapor erosion, ensuring stable and accurate detection signals in humid and temperature-alternating HVAC working environments.
Q: Can it be customized for special refrigeration equipment?
A: Yes. We provide all-round customized services including probe size, temperature resistance grade, medium adaptation and installation methods, which can meet the matching needs of special low-temperature refrigeration units and compact HVAC equipment.
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