BF350 Strain Gauge

The BF350 Strain Gauge is a high-precision resistive foil sensor engineered for measuring strain, stress, or pressure in mechanical structures. With a nominal resistance of 350 Ω, it is ideal for load measurement, tension sensing, and force monitoring applications.

This sensor operates on the principle of resistive variation—its electrical resistance changes in response to deformation on the attached surface. The change is measured using a Wheatstone bridge circuit, which can then be interfaced with an amplifier such as the HX711 Load Cell Amplifier.

Technical Specifications

• Model: BF350

• Type: Foil Strain Gauge

• Nominal Resistance: 350 Ω ± 0.1 %

• Gauge Factor (Sensitivity): 2.0 ± 1 %

• Base Material: Polyimide Film

• Operating Temperature Range: −10 °C ~ +80 °C

• Strain Limit: ≤ 2 %

• Resistance Tolerance: ± 0.1 Ω

• Dimensions: 6 mm × 3 mm (approx.)

Key Features

✅ High sensitivity and repeatability
✅ Stable performance over wide temperature ranges
✅ Compact design—easy to mount on metals, plastics, or composites
✅ Compatible with Arduino, Raspberry Pi, and HX711 modules
✅ Ideal for custom load cell and pressure sensor fabrication

Applications

• ⚙️ Load Measurement Systems – Build DIY or industrial load cells

• 🧰 Force Sensors – Used in robotics and automation

• 🧱 Structural Stress Testing – Monitor deformation in beams or materials

• 🚗 Automotive Engineering – Measure suspension or chassis stress

• 🔬 Research & Education – Engineering lab experiments and sensor calibration

Working Principle

When the BF350 is bonded to a surface, any mechanical strain applied causes the thin foil element to stretch or compress, changing its resistance. This small resistance variation (in milliohms) is then converted to voltage using a Wheatstone bridge circuit and amplified by modules like the HX711 before being read by microcontrollers such as Arduino boards.

Precautions

• Ensure the bonding surface is clean and dry before mounting.

• Use high-quality strain gauge adhesive for accurate results.

• Avoid overheating during soldering—use low-temperature techniques.

• Calibrate the sensor using a known load for best accuracy.

YouTube Tutorial

🎥 Watch: How to Connect a Strain Gauge with HX711 & Arduino

Internal Links

• Arduino and Accessories

• Electronics Components

• HX711 Load Cell Amplifier

• Tools and Accessories

Summary

The BF350 High Precision Strain Gauge is a reliable, high-accuracy sensing element suitable for force, weight, and stress measurement applications. Its excellent sensitivity, compact design, and compatibility with Arduino and HX711 amplifiers make it the perfect choice for IoT, industrial automation, and research projects.