The basis for the classification of precision grades (core judgment dimensions)

The Principle of Cumulative Error Priority: The core of accuracy classification lies in "cumulative weight error," not "instantaneous flow error"—since electronic belt scales are used for continuous measurement, cumulative weight (e.g., batch total, daily production) serves as the primary measurement indicator, while instantaneous flow is merely for monitoring reference.

Equipment Structure and Configuration Matching:

Grade 0.5: Requires pairing with a high-precision weighing frame (e.g., floating type, double-lever multi-idler type with a measurement section length ≥3 idler groups), C3-grade or higher load cells (error ≤±0.01%), non-contact speed sensors (speed error ≤±0.1%), and must be equipped with automatic zero adjustment, temperature compensation, and belt tension compensation functions.

Grade 1: May use a single-lever multi-idler weighing frame, C3-grade load cells, contact or non-contact speed sensors, and support basic zero adjustment and error correction functions.

Grade 2: A single roller or cantilever weighing frame can be selected, along with C6-grade load cells (error ≤ ±0.03%). The structure should be simple and meet basic measurement requirements.

```Measurement Purpose Adaptation:```

Trade Settlement: Must select a Class 0.5 meter (some regions require Class 0.2, which requires special customization), and it must pass the inspection by a statutory metrology authority and obtain a measuring instrument license (CMC mark).

Internal Process Control: Level 1 is sufficient; Level 2 can be adopted for rough monitoring scenarios, offering lower costs and simpler maintenance.