T/GVEAIA 031.4-2026 Rare Earth Intervention in Agricultural Product Production Regulation Part 4: Equipment and Calibration

Scope

This document specifies the classification and identification of gas deposition equipment used in the regulation of rare earth intervention in agricultural product production, its metrological characteristics and calibration requirements, metrological traceability, calibration conditions, calibration items and procedures, and the processing of calibration results and the requirements for the interval between recalibrations. This document applies to the initial calibration, subsequent calibration, and in-use inspection of VPM-EVD reactors, GLI-EVD systems, and their auxiliary equipment. This document provides metrological traceability assurance for the equipment parameters specified in T/GVEAIA 031.3 (gas deposition process), ensuring process reproducibility and product quality stability. 5. Metrological Characteristics and Calibration Requirements 5.1 General Metrological Characteristics 5.1.1 Accuracy Class Class A equipment: Accuracy class not less than 1.0 (or error limit ≤ ±1.0% FS); Class B equipment: Accuracy class not less than 2.5. 5.1.2 Resolution Temperature: 0.1°C; Pressure: 0.1 Pa (vacuum section), 10 Pa (normal pressure section); Flow rate: 0.1 sccm (standard cubic centimeters per minute); Electrical parameters: Voltage 0.1 V, current 1 mA. 5.2 Calibration Requirements for Special Equipment 5.2.1 Temperature Control System Evaporation source temperature: Calibration points 400°C, 500°C, 600°C, 700°C, 800°C, with a tolerance of ±5°C; Reaction chamber environment temperature: Calibration points 25°C, 40°C, 80°C, with a tolerance of ±2°C; Crop surface temperature (infrared temperature measurement): Calibration points 20°C, 30°C, 50°C, with an emissivity setting of 0.95, and a tolerance of ±1°C. 5.2.2 Vacuum/Pressure System Vacuum gauge (Pilani/thermocouple gauge): Full-scale calibration, with a focus on checking the range of 10-1-103 Pa, with a tolerance of ±20%; Pressure sensor (thin-film gauge): Linearity check at 103-

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