An S-Type load cell, often called an S-Beam load cell, is a force transducer named for its distinct “S” shape. Its unique mechanical design allows it to accurately measure force in two directions:

• > Tension (Pulling Force): Commonly used in suspended weighing applications like crane scales, hopper scales, and tension test rigs.
• > Compression (Pushing Force): Used in bench scales, material testing machines, and tank weighing systems.

The main advantage is its versatility and compact size, which makes it ideal for inline force measurement where space is limited and both pushing and pulling forces need to be monitored.

What are the most common applications for S-Type load cells?

S-Type load cells are preferred in systems requiring high accuracy for both tension and compression measurements.

• > Tank and Hopper Weighing: Used in a suspended configuration for measuring the contents of large vessels.
• > Material Testing Machines: Integral to tensile and compression testing equipment to determine the strength and durability of materials.
• > Suspended Weighing: Hanging scales, crane scales, and lifting mechanism monitoring.
• > Batching and Packaging Systems: Used for precise fill control and weight checks in production lines.
• > Tension Control: Monitoring cable, web, or belt tension in manufacturing processes.

Accurate installation is critical, as S-Type cells are sensitive to off-axis (side) loading.

1. Axial Alignment: The applied force must be perfectly aligned with the central axis of the load cell (the vertical line passing through the two threaded holes).
2. Use Accessories: Always use appropriate mounting hardware like rod end bearings (clevises or eye bolts) on both the top and bottom mounting holes. These accessories help ensure the load remains axial and compensate for minor initial misalignment, preventing inaccurate readings and potential damage from bending moments.
3. No Bending/Torsion: The setup must prevent any side forces, bending, or twisting (torsional) moments from reaching the load cell body.

The rated capacity should always be higher than the maximum expected force to ensure safety and prevent overload damage.

• > Static Load: For a purely static (non-moving) application, select a load cell with a capacity of 120% to 150% of the maximum expected load.
• > Dynamic/Shock Load: For applications involving sudden movements, vibration, or shock loading (like crane or packaging systems), select a capacity of 150% to 200% of the maximum expected load.

Always account for the weight of any attached rigging (like eyebolts or cables) when calculating the total maximum load.

S-Type load cells are commonly manufactured from materials suitable for industrial use:

The IP (Ingress Protection) rating is key. For most indoor, dry environments, IP65 is sufficient. If the load cell will be exposed to regular washdowns, high humidity, or outdoor weather, an IP67 or IP68 rating is essential for longevity.