40Kg Load Cell
40 kg Load Cell – Overview
A load cell is a transducer that converts a force (usually weight) into an electrical signal. The 40 kg load cell is designed to measure weights up to 40 kilograms with high precision, commonly used in electronic weighing scales, industrial measurement systems, and DIY projects.
Key Features
Capacity: 40 kg maximum load
Type: Strain gauge load cell (commonly a single-point or S-type)
Output Signal: Typically 2 mV/V ±1% at full scale
Excitation Voltage: 5–10 V DC
Material: Alloy steel or stainless steel (durable and corrosion-resistant)
Accuracy Class: ±0.1–0.2% of full scale (depends on calibration)
Mounting: Pre-drilled holes for screws; can be mounted on flat surfaces
Temperature Range: −10 °C to +40 °C (operating)
Applications: Scales, robotic force measurement, industrial automation, laboratory balances, and load testing
How It Works
Force Applied: When a weight is placed on the load cell, it exerts a force on the sensing element.
Strain Gauge Response: The internal strain gauge deforms slightly.
Electrical Signal Change: The deformation changes the resistance in the strain gauge, generating a tiny voltage variation.
Signal Amplification: An amplifier (like an HX711) converts this small signal into a readable digital value.
Technical Specifications (Typical)
| Parameter | Value |
|---|---|
| Maximum Load | 40 kg |
| Material | Alloy steel / stainless steel |
| Rated Output | ~2 mV/V |
| Excitation Voltage | 5–10 V DC |
| Non-Linearity | ≤0.1% FS |
| Hysteresis | ≤0.1% FS |
| Operating Temp | −10 °C to +40 °C |
| Storage Temp | −20 °C to +60 °C |
| Connection | 4-wire or 6-wire (Red, Black, Green, White, optional Blue & Yellow for sense) |
Wire Color Code (4-Wire Typical)
Red: Excitation+ (VCC)
Black: Excitation− (GND)
Green: Signal+ (Output+)
White: Signal− (Output−)
Advantages
High precision for small and medium loads
Compact and easy to integrate
Durable and suitable for repeated measurements
Compatible with microcontrollers via amplifier modules
Applications Examples
Electronic Weighing Machines – kitchen scales, industrial scales
Robotics & Automation – measuring applied force or pressure
Material Testing – testing mechanical strength
DIY Projects – smart scales, load-monitoring devices
