Button Load Cells

What Are Button Load Cells?

Button load cells are compact, low-profile force sensors designed to measure compression forces in confined spaces. The TC-LB series from Transcell delivers precision compression measurement in a disk-shaped form factor, making them ideal for integration into test frames, robotic end-effectors, assembly automation, and monitoring applications where space is limited.

Unlike larger cylindrical load cells, button cells sit flush in applications that require point-contact force sensing. The passive mV/V output means the sensor requires only a signal conditioning circuit or data acquisition system — no on-board electronics, no power management, no software initialization. This passive architecture provides exceptional reliability in high-temperature environments and simplifies integration into existing instrumentation setups.

The TC-LB series replicates the mechanical form factor and electrical output of the Futek LLB400 and LLB450, offering a direct replacement for existing systems while maintaining the industrial-grade reliability expected in manufacturing and test environments.

Key Features & Technical Attributes

Model Selection & Capacity Range

The TC-LB series offers seven capacity points covering 100 lbf minimum to 10,000 lbf maximum. This range spans light compression (electronics assembly, small-part pressing) through heavy industrial pressing, crimping, and material testing.

Key Selection Tip: For multi-range applications, always select the smallest capacity that accommodates your maximum operating load. Oversizing causes reduced signal resolution at lower forces. A 1,000 lbf cell loaded at 200 lbf loses measurement sensitivity compared to a 500 lbf cell at the same load.

Mounting, Integration & Installation

Button load cells integrate via three primary mounting strategies: direct compression mounting, test frame integration, and OEM-embedded assembly.

Direct Compression Mounting

The most common installation: machine the sensing point flat and perpendicular to load direction, position the button load cell, and apply compressive force directly to the load button. The cell must be supported on its circumference to prevent lateral deflection. For small capacities (100–500 lbf), use precision parallels or guide rails. For heavy loads (5,000–10,000 lbf), integrate into a rigid test frame to maintain alignment.

Test Fixture Integration

Mount the TC-LB cell between upper and lower platens of a universal test machine, compression tester, or custom fixture. Ensure the load button aligns with the test sample to avoid off-axis loading. Attach the 10 ft shielded cable to the data acquisition system, conditioning amplifier, or PLC analog input. The passive output simplifies wiring — no isolated signal loops or impedance-matching circuits required for standard industrial distances up to 100 feet.

Robotics & End-Effector Assembly

For collaborative robot grippers or automated assembly arms, embed the TC-LB directly in the gripper jaws or contact point. The low-profile form factor minimizes gripper bulk. Wire the sensor through the arm’s internal cabling to the control cabinet. The stainless steel body provides durability in multi-shift production environments.

Installation Note: Avoid misalignment. Lateral forces exceeding 10% of rated capacity can cause stress concentration at the load button and accelerate fatigue. Use self-aligning spherical washers or precision guide systems if the application permits transverse loading.

Who These Are For

Standards, Certification & Calibration

The TC-LB series is manufactured to ISO 376 force measurement standards and designed to integrate into test systems complying with ASTM compression testing methods (ASTM D6289, ASTM D695, ASTM C39 concrete compression, and similar). Each sensor undergoes static calibration and is shipped with a 3-year traceability certificate referencing NIST standards.

The stainless steel body meets FDA indirect food contact requirements (CFR Title 21) and is compatible with pharmaceutical washdown protocols. Passive mV/V output avoids complex isolation or shielding requirements common in active sensors.

Recalibration: Transcell offers annual recalibration services with documented calibration reports. For high-cycle or high-temperature applications, schedule recalibration every 12–24 months to maintain measurement traceability.

How Transcell Compares

Transcell TC-LB button load cells compete directly with Futek LLB series (original manufacturer) and generic stainless steel load cells from overseas suppliers. Here’s what differentiates TC-LB:

vs. Generic Stainless Cells: Low-cost imports often sacrifice temperature stability and hysteresis control. The TC-LB maintains ±0.20% F.S. hysteresis even after 100,000 load cycles. Stainless material is certified 304-grade (not 420 with unknown alloy composition). Passive output simplifies integration compared to cells requiring custom signal conditioning.

vs. Load Pins: Load pins offer lower cost but limited accuracy (±0.5–1.0%) and poor temperature compensation. Button cells excel when repeatability and measurement accuracy matter more than minimizing component cost.

Related Transcell Load Cell Types

Frequently Asked Questions