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+86 189 8978 2810

GSK series stainless steel float level switch

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Extra-long rod design up to 1000mm depth sensing

Suitable for deep tanks and large containers

High-precision reed switch liquid level control

Corrosion-resistant stainless steel construction

Stable performance for industrial applications

Suitable for water, oil, and chemical liquids

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Application

Deep Water & Storage Tanks

Accurate liquid level monitoring for deep tanks, reservoirs, and large storage containers.

Sewage & Wastewater Systems

Reliable level control for sewage treatment and wastewater management applications.

Industrial Liquid Storage

Suitable for oil, chemical, and industrial liquid storage tanks requiring stable level detection.

Water Treatment & Pump Control

Automatic level monitoring and pump control for water treatment systems.

Industrial Automation & Alarm Systems

Liquid level detection solutions for automated processes and high/low level alarm applications.

Description

Description Background

The stainless steel long rod float level switch is a reed switch type liquid level controller designed for deep tanks and large containers. With an extended rod length of up to 1000mm, it enables accurate liquid level detection in deep-level applications where standard float switches are not suitable.

Featuring a large 100×100mm float ball, the switch provides stronger buoyancy and more stable operation in sewage, impurity-containing liquids, and environments with liquid fluctuations. The extended structure improves installation flexibility and monitoring reliability.

Made of high-quality stainless steel with laser welding technology and imported reed switch components, it offers excellent corrosion resistance, stable switching performance, and long service life for water, oil, chemical liquid, and industrial level control systems.

Features

01DEPENDABLE
The rainproof aluminum junction box provides reliable protection and makes the float switch suitable for outdoor environments.
Cast Aluminum Rainproof Junction Box for Outdoor Use
Cast Aluminum Rainproof Junction Box for Outdoor Use
02EFFICIENT
Equipped with a high-quality reed switch for fast and sensitive level detection, with excellent durability and a long service life.
High-Quality Reed Switch
High-Quality Reed Switch
03SECURE
The large 100 × 100 mm float provides greater buoyancy, making it suitable for sewage, wastewater, and other challenging liquid-level applications.
100 × 100 mm Large Float for High Buoyancy
100 × 100 mm Large Float for High Buoyancy
04CONVENIENT
Durable stainless steel construction and reliable internal components ensure stable operation and long-lasting performance.
Long Service Life
Long Service Life

Technical Details

Product Type:

Float Level Switch

Product Model:

GSK-1A / GSK-1B / GSK-2A / GSK-2B / GSK-1C / GSK-2C /

Material:

Stainless Steel (304/316 Optional)

Size:

See attached drawing

Type:

GSK Series Float Level Switch

Operating Temperature:

-30°C to +120°C

Installation Type:

Threaded Mounting

Rod Length:

Customizable according to tank depth

Float Size:

100×100mm

Protection Level:

IP65

Maximum Power:

250VA

Maximum Switching Voltage:

250V

Maximum Switching Current:

1A

Maximum Working Pressure:

<1MPa

Maximum Contact Resistance:

≤0.15mΩ

Functional Types:

GSK-1A: High level start / low level stop (drainage control) GSK-1B: Low level start / high level stop (water supply control) GSK-2A / 2B: Two-point control + high/low level alarm GSK-1C / 2C / 3*: Multi-point liquid level signal output for display systems Switch Type: Reed Switch (NO/NC combinations) Junction Box: Die-cast aluminum waterproof enclosure Protection Level: IP65 or higher Feature: High sensitivity, customizable structure, stable operation

Accessories

We reserve the right to make technical alterations without prior notice.
Dimensions
Wiring diagram

What is the GSK series float level switch used for?

The GSK series stainless steel float level switch is used for liquid level detection and automatic control in industrial tanks, reservoirs, and automation systems. It is widely used for: Water tank level monitoring Pump automatic start/stop control High and low liquid level alarms Overflow protection Dry-run protection Industrial process automation systems It provides stable ON/OFF liquid level switching signals.

What is the working principle of the GSK float switch?

The switch operates through a magnetic float and reed switch structure. When the liquid level changes: The float moves up or down The internal magnet approaches the reed switch The reed switch opens or closes the circuit This allows automatic liquid level control without complicated electronic structures.

What material is the float switch made of?

The float ball and rod are made of SU304 stainless steel. Main advantages include: Corrosion resistance High mechanical strength High temperature resistance Long service life 316 stainless steel versions may also be available for corrosive liquids.

Is it normally open (NO) or normally closed (NC)?

It supports both Normally Open (NO) and Normally Closed (NC), depending on the float orientation. The switching logic can be changed by reversing the float by 180°. Lower-Open Type (Default) ① When the liquid level rises, the float moves away from the reed switch position, and the switch turns OFF. ② When the liquid level falls, the float returns to the reed switch position, and the switch turns ON. Upper-Open Type ① When the liquid level rises, the float returns to the reed switch position, and the switch turns ON. ② When the liquid level falls, the float moves away from the reed switch position, and the switch turns OFF. Note The factory default is usually the lower-open type, but users can adjust it according to control requirements.

What is the control stroke of the float switch?

The control stroke of the single-float model is approximately 10 mm. This means: High sensitivity Fast response Suitable for precise liquid level detection If a larger liquid level difference is needed, users can: Install two switches at different heights Use a double-float model

Can the float switch directly control pumps or solenoid valves?

No — not recommended for direct load switching. The internal reed switch is designed for low-current signal applications and should not directly control inductive or high-power loads such as pumps or solenoid valves. Recommended solution: Control signal → relay or PLC input Pump or valve → relay / contactor / motor starter ⚠️ In low-power applications (small DC pumps or low-current valves), direct switching may be possible only if the load is within the switch rating. Direct connection may reduce lifespan or damage the reed contacts.

Can the float position be adjusted freely?

No. The float position is fixed by circlips, and the internal reed switch position cannot be moved. Simply moving the circlips will not effectively change the switching point. If special switching positions are required, customized dimensions are recommended.

What liquids is it suitable for?

Suitable for: Clean water Oil Cooling liquids Industrial liquids compatible with stainless steel Not recommended for: Heavy sludge Liquids with floating debris High-viscosity media Because the switch is highly sensitive, clean liquid environments are recommended.

Can rod length and float quantity be customized?

Yes. Customization options include: Rod length Float quantity (1–4 floats or more) Mounting structure Cable length OEM / ODM production This makes the GSK series suitable for various tank structures and industrial projects.

What should buyers confirm before ordering?

Before purchasing, buyers should confirm: Liquid type Working temperature Working pressure Required rod length Float quantity Installation direction NO / NC logic Electrical specifications Quantity and customization requirements This helps ensure compatibility with the actual application system.

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