Introduction

Weighment is the process of measuring the weight of an object, commonly used in industrial and commercial applications such as agriculture, logistics, and manufacturing. This document describes a weighment system using load cells, an amplifier, a weighment indicator (display), and calibration procedures.

Components

• Load Cells: Load cells are sensors that convert force (weight) into an electrical signal. There are different types of load cells, such as strain gauge, hydraulic, and capacitive load cells. In this system, strain gauge load cells are used for accurate measurement.
• Junction Box: A junction box is used to connect multiple load cells. Since six load cells are used in this system, they are wired into a junction box containing an amplifier that sums up the signals from all load cells and converts them into a readable format.
• Weighment Indicator: This unit processes the amplified signal and converts it into a weight reading, displayed in kilograms or other units. It provides an interface for users to read the weight measurement and calibrate the system.

Working Principle

• Each of the six load cells measures a portion of the total weight and sends an electrical signal to the junction box.
• The junction box contains an amplifier that sums up the signals from all six load cells and converts them into a single weight value.
• The amplified signal is transmitted to the weighment indicator, which processes the signal and displays the total weight.
• The display unit can be connected to other systems for data logging or automation purposes.

Installation Tips

• Mount load cells on a firm, stable surface.
• Use shielded cables to prevent signal interference.
• Protect the junction box from dust and moisture.

Calibration

Zero the system, apply known weights, and ensure all load cells contribute equally.

Formula: Weigh = (Measured Signal × Calibration Factor) + Offset

Advantages

• High measurement accuracy
• Even weight distribution
• Expandable and durable setup

Troubleshooting

• Inconsistent Readings: Check wiring and recalibrate.
• Noise Issues: Use proper grounding and shielding.
• Drifting Readings: Monitor environmental factors and perform regular calibration.

Conclusion

A weighment system using multiple load cells connected to an amplifier and a weighment indicator provides an accurate and reliable method for measuring grain weight. Proper calibration ensures the precision of measurements, making the system suitable for industrial applications. Additionally, understanding the connectivity details, installation requirements, and troubleshooting methods ensures a robust and reliable weighment setup.