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GSK Series Stainless Steel Single-Ball Float Level Switch: Long Rod, High-Precision Liquid Level Control

May 13, 2026

Accurate and reliable liquid level detection is essential for industrial automation and fluid management systems. The GSK Series stainless steel single-ball float level switch is a high-performance reed switch liquid level controller designed for precise monitoring of water, oil, and industrial liquids in tanks and containers.

Built with a long stainless steel rod up to 1000 mm, high-sensitivity magnetic reed switch, and precision laser-welded sealing, the GSK series delivers reliable, durable, and highly precise liquid level control.


Product Overview

The GSK series uses a straight rod stainless steel float design with a single high-buoyancy float. As liquid levels rise or fall, the float moves along the rod, triggering the internal reed switch through magnetic force, generating an ON/OFF signal for pumps, valves, or alarm systems.

Key features include:

  • Extra-long stainless steel rod (up to 1000 mm) for deep or tall tanks
  • High-sensitivity magnetic reed switch for fast and accurate response
  • Precision control stroke of ~10 mm for extremely sensitive liquid level detection
  • Durable 304/316 stainless steel construction for corrosion resistance and mechanical strength
  • Laser-welded, waterproof design ensures long-term reliability
  • Customizable rod length for specific tank sizes
  • No external power needed for operation

High Sensitivity and Control Stroke

The control stroke of the single-float GSK model is approximately 10 mm, meaning the switch responds to very small liquid level changes. This provides:

  • High sensitivity
  • Fast response
  • Precise liquid level detection

For applications requiring a larger liquid level difference, users have two options:

  1. Install two GSK switches at different heights to create a wider detection range
  2. Use a double-float model if dual-level monitoring is required

This flexibility makes the GSK series suitable for both precise and larger-scale liquid level control requirements.


Working Principle

The switch operates using a simple but reliable magnetic reed switch mechanism:

  1. The stainless steel float moves with the liquid level.
  2. The magnet inside the float approaches the reed switch.
  3. The reed switch changes state (ON/OFF).
  4. The signal controls pumps, valves, or alarm systems.

The hermetically sealed reed switch ensures reliable performance, unaffected by liquid contamination, pressure, or environmental factors.


Industrial Applications

Thanks to its long rod and precise control stroke, the GSK series is ideal for a wide range of applications:

  • Water tanks and storage systems, including deep tanks
  • Industrial process equipment
  • Water treatment and purification systems
  • Boilers, cooling, and heating systems
  • Pump automation and liquid level alarms
  • Oil and chemical tanks
  • Mechanical and OEM automation equipment

Advantages of the GSK Series

  • Extra-long rod up to 1000 mm for deep or tall tanks
  • High-sensitivity magnetic reed switch with ~10 mm control stroke
  • Durable stainless steel (304/316) construction for corrosion resistance
  • Laser-welded, waterproof design for long-term reliability
  • Compact, straight-rod design for easy installation
  • Stable operation even under liquid turbulence
  • Low maintenance and long service life

Compared with plastic or cable-type switches, the GSK series offers enhanced durability, precision, and stability, especially in industrial environments requiring long rods and precise level detection.


Why Choose ELECALL GSK Series

ELECALL specializes in industrial automation and liquid level solutions. The GSK series reflects ELECALL’s focus on:

  • Industrial-grade reliability
  • High-quality stainless steel construction
  • High-precision magnetic reed switch technology
  • Laser-welded sealing for waterproof performance
  • Flexible rod length and installation options

This makes the GSK series a trusted solution for engineers, system integrators, and OEM manufacturers worldwide.


Conclusion

The GSK Series stainless steel single-ball float level switch combines extra-long rods, high-sensitivity magnetic reed switches, and precise 10 mm control stroke, providing accurate and reliable liquid level detection.

Ideal for deep tanks, industrial automation, and process systems, the GSK series ensures:

  • Precise ON/OFF control
  • Long-term durability in harsh environments
  • Easy installation and maintenance
  • Stable, consistent performance

With its stainless steel durability, precision design, and high sensitivity, the GSK series is an excellent choice for modern industrial liquid level control systems.

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