What is Belt Weigher Idler Spacing? Calibration Methods Explained

Belt weighers are among the most widely used weighing tools in China’s industrial production. They operate by continuously measuring bulk materials transported on conveyor belts. With diverse types of electronic belt weighers available, their adoption has grown rapidly alongside industrial and economic development.

However, inaccuracies in belt weigher measurements have become a common issue. The span—a critical parameter in belt weigher systems—directly determines weighing precision. It refers to the ratio of the sensor’s unit electrical signal output to the total weighing range, reflecting load sensitivity and accuracy.

Four Primary Calibration Methods for Belt Weigher Span:

·Material Calibration (high cost, complex procedures)

·Chain Code Calibration (most widely adopted for its cost-effectiveness and simplicity)

·Loop Calibration (limited to load cell verification due to mechanical constraints)

·Electronic Calibration (less accurate than material-based methods)

Recommended Calibration Procedure:

1.Zero Adjustment: Stabilize the zero point through 2-3 adjustments.

2.Span Verification: Fine-tune the span value using chain codes, loop tests, or material tests.

Chain code calibration is prioritized for its balanced accuracy, operational ease, and cost efficiency, making it the optimal choice for most industrial applications.