Magnetic Float Level Switch

Traditional magnetic level gauges fitted with alarm switches or reed switches integrate display panel + switch function, which are suitable for large storage tanks requiring real-time liquid viewing together with interlock control. But for small water tanks, dosing barrels, circulation water pools and auxiliary equipment in factories, most production lines only need simple level start-stop control instead of continuous liquid level reading, and bulky side-mounted magnetic level gauges will cause waste of installation space and procurement cost.

Our Magnetic Float Level Switch is developed purely for point-level control scenarios, removing redundant indicator flapper structure completely. It only retains the core float induction & reed triggering mechanism, realizing automatic pump startup, valve cut-off and overflow protection when liquid reaches preset height. Different from magnetic level gauge with reed switch which focuses on multi-point signal access for DCS centralized control and magnetic level gauge with alarm switch which focuses on tank safety anti-overflow monitoring, this float switch targets simple local automatic control, cost reduction and space-saving demands.

It supports top vertical installation and lateral side installation flexibly, adapts narrow tank openings and compact equipment layout, with fully sealed internal reed components isolated from medium. It works reliably in humid, corrosive and vibration workshops, delivering stable passive switch signals to complete basic liquid level automatic circulation control with zero extra power supply.

• Pure Point Control Design, No Redundant Display Structure Cancel flapper display mechanism of magnetic level gauge, only execute liquid level threshold switch action, greatly reduce overall volume and equipment cost, perfect for small containers that do not need to check real-time liquid level.
• Dual Installation Mode for Flexible Layout Support top vertical installation and side horizontal installation, fit narrow manholes, small threaded ports of dosing tanks, water tanks and equipment water jackets, solve installation limitation problems of large side-mounted magnetic level gauges.
• Hermetically Sealed Non-contact Induction Structure Reed switches are fully sealed inside the guide stem and isolated from process liquid; float triggers magnetic signal without mechanical contact, no abrasion, anti-sticking, service life up to millions of switching cycles.
• Multiple Wetted Material Matching 304 SS, 316L stainless steel, PP, PVC, PVDF float & stem optional, adapt clean water, sewage, weak acid & alkali chemical liquids, edible medium and other different media environments.
• Single / Dual Limit Configuration Optional Standard high-level overflow cut-off + low-level water replenishment dual-point structure; single-point switch version available for simple overflow protection working conditions.
• IP65 Protection & Optional Explosion-proof Version Junction box reaches IP65 dustproof & waterproof grade; Ex-proof structure can be customized for petrochemical flammable liquid tanks, safe for explosive hazardous areas.
• Ultra-low Maintenance Requirements Simple structural composition, rarely blocked by impurities in water medium; only regular cleaning of float surface is needed, no debugging required after installation.
• Direct Drive Relay & Small Load Equipment Passive dry contact output, can directly connect water pumps, solenoid valves, audible alarms without intermediate signal converters, simplify on-site control circuit layout.

This magnetic float level switch simplifies the structure based on buoyancy magnetic induction principle, removes continuous level display module, and optimizes the internal reed layout for point control working conditions. All specifications are configured for compact installation and low-cost automatic control, detailed parameters are listed below:

Positioned for lightweight automatic level control scenes, widely used in auxiliary production facilities that only need limit interlock without continuous liquid level observation:

• Factory Circulating Water & Cooling Water System Cooling water storage tank, chilled water buffer tank, automatically start & stop circulating pumps according to liquid level.
• Water Treatment & Sewage Station Sewage collecting tank, clean water tank, dosing barrel level control, realize automatic dosing and sewage lifting pump linkage.
• HVAC & Central Air-conditioning Equipment Air conditioner condensate water tray, expansion water tank, prevent water overflow inside air-conditioning units.
• Fine Chemical Small Dosing Tanks Laboratory chemical barrels, small acid-base mixing tanks, high liquid level automatic feeding stop protection.
• Food & Beverage Production Auxiliary Tanks Pure water storage tank, cleaning liquid tank in food workshops, sanitary stainless steel float version available.
• Marine & Machinery Equipment Water Jacket Engine cooling water tank, marine bilge water cabin, compact installation saves cabin space.

Q1: What is the essential difference between magnetic float level switch and magnetic level gauge with alarm/reed switch?

A: Magnetic level gauge with alarm or reed switch takes magnetic flapper level display as the main body, switch is an additional accessory, it can view real-time liquid height while realizing alarm interlock, suitable for large storage tanks. Magnetic float level switch has no liquid display panel at all, it is a pure control component only used for high/low level on-off actions, smaller size and lower cost, used for small barrels, water tanks that do not need liquid observation.

Q2: Can magnetic float level switch realize multi-point segmented level signal output like reed switch type magnetic level gauge?

A: Conventional versions only support 1~2 limit points, multi-point customized scheme is available but cost advantage will disappear; if you need 3 or more segmented level signals to access PLC system, magnetic level gauge with reed switch is more recommended.

Q3: Will viscous medium cause float stuck failure?

A: The float adopts streamlined anti-adhesion structure. For viscous medium with viscosity higher than 5×10⁻⁴ ㎡/s, we will match large-diameter floating ball to reduce adhesion probability.

Q4: Can this float switch be refitted with display panel later to view liquid level?

A: Its guide stem structure is specially designed for built-in reed layout, reserved space for flapper indicator is not available, cannot be modified into magnetic level gauge with display function.

Q5: Is stainless steel float applicable for hydrofluoric acid and strong alkali medium?

A: Stainless steel will be corroded by hydrofluoric acid, PVDF full plastic float should be selected for HF, caustic soda working conditions.

Q6: Can float switch work normally in vibrating equipment environment?

A: Internal reed is fixed firmly, matched with damping float structure, it can resist normal mechanical vibration of water pumps and production lines without false triggering.

Q7: Why can the gauge resist up to 400℃ while the alarm switch only supports 120℃?

A: The main measuring tube & float directly contact process liquid and adopt high-temperature alloy & samarium-cobalt magnetic steel for high temperature resistance. The reed alarm switch contains electronic components with a natural temperature limit of 120℃. When medium temperature exceeds 120℃, we install heat insulation spacers between the guide rail and measuring pipe to isolate heat transfer, keeping the switch working environment within 120℃ safely without affecting magnetic triggering.

If you only need automatic replenishment and overflow protection for water tanks, dosing barrels and auxiliary equipment, there is no need to purchase large magnetic level gauges with display panels which raise cost and occupy installation space. Our magnetic float level switch realizes accurate limit control with compact structure and low investment, different materials and explosion-proof types can be selected according to medium characteristics.

Submit your installation mode, medium temperature & pressure, required control points and medium corrosiveness, our engineers will configure the most cost-effective float switch solution and offer factory direct price.

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