DICKEY-john GAC2500AGRI Grain Moisture and Density Analyzer

Overview

The DICKEY-john GAC2500AGRI Grain Moisture and Density Analyzer is an industrial-grade, benchtop instrument engineered for rapid, non-destructive quantification of moisture content, bulk density (test weight), and grain temperature in raw agricultural commodities. It operates on a dual-sensor high-frequency dielectric principle—utilizing a stabilized 149 MHz radiofrequency signal to simultaneously measure capacitance and conductance across the sample volume. This method correlates dielectric permittivity and loss factor with bound and free water distribution, enabling traceable, physics-based moisture determination without chemical reagents or oven-drying. Unlike traditional resistance-based meters, the GAC2500AGRI’s frequency-modulated sensing architecture minimizes interference from grain composition, kernel size variation, and surface moisture—critical for heterogeneous lots encountered in elevator intake, seed conditioning, and feed mill quality control. Its measurement cycle completes in ≤30 seconds per sample, delivering results aligned with AOAC 992.03 and ISO 712 reference methods, with documented bias <±0.2% against gravimetric standards under routine operational conditions.

Key Features

• High-frequency dielectric analysis at 149 MHz—optimized for minimal calibration dependency and maximal robustness across moisture gradients
• Integrated non-contact infrared temperature sensor enabling direct grain surface and bulk temperature measurement from −20 °C to +45 °C, with automatic thermal compensation applied in real time
• Full-color capacitive touchscreen interface with intuitive icon-driven workflow—designed for operation by personnel with variable technical training levels
• Preloaded calibration library covering eight major commodity groups (e.g., corn, wheat, soybean, barley, oats, rice, sorghum, flaxseed), plus downloadable extensions for specialty crops (e.g., coffee beans, almonds, sunflower seeds, pelleted feed)
• Automated mass recognition and tare compensation via built-in precision electronic balance (0.1 g resolution)
• Surface moisture correction algorithm that distinguishes adsorbed surface water from internal moisture—reducing overestimation in damp-harvested grain
• NTEP-certified performance (Certificate #19-045E) and USDA-UGMA validation confirming metrological equivalence to official inspection protocols
• GLP-compliant data handling: timestamped records, operator ID tagging, and configurable password protection for method editing and calibration access

Sample Compatibility & Compliance

The GAC2500AGRI accepts intact, unground kernels and granular materials—including whole grains, oilseeds, legumes, grass seeds, and processed feed pellets—without preprocessing. Sample integrity is preserved throughout analysis, supporting downstream testing (e.g., germination, mycotoxin screening). All calibrations are traceable to NIST-traceable reference standards and validated per ASTM D6253 (Standard Practice for Calibration of Moisture Meters for Wood and Other Cellulosic Materials) and ISO 6540 (Cereals and cereal products — Determination of moisture content — Reference method). Instrument firmware supports 21 CFR Part 11–compliant electronic signatures when paired with validated LIMS integration. Regulatory documentation—including NTEP reports, UGMA certification letters, and factory calibration certificates—is supplied with each unit.

Software & Data Management

Onboard firmware provides local storage of up to 2500 test records, each containing moisture (% w.b.), bulk density (lb/bu or kg/hL), grain temperature (°C/°F), date/time stamp, operator ID, and calibration ID. Export options include CSV via USB flash drive or network transfer (FTP/SFTP). Optional DICKEY-john DataLink software enables centralized fleet management, statistical process control (SPC) charting, batch reporting, and automated PDF certificate generation. Audit logs record all configuration changes, calibration events, and user logins—meeting GLP/GMP documentation requirements for regulated food and feed facilities.

Applications

• Grain receiving and grading at elevators and cooperatives
• In-line quality verification during seed conditioning and coating operations
• Moisture profiling in drying and storage management systems
• Feed formulation consistency checks in compound feed mills
• Research applications in agronomy, postharvest physiology, and breeding programs
• Compliance monitoring for FDA Food Safety Modernization Act (FSMA) Preventive Controls and HACCP plans

FAQ

Does the GAC2500AGRI require daily recalibration?
No—factory-installed calibrations remain stable for ≥6 months under normal use; verification against reference samples is recommended weekly.
Can it measure frozen or hot grain directly from dryer discharge?
Yes—the non-contact IR sensor measures surface temperature independently, and the dielectric system compensates for thermal drift across −20 °C to +45 °C.
Is NTEP certification valid for commercial grain trade settlements?
Yes—NTEP Class III approval authorizes its use in official weight-and-measure transactions governed by state and federal weights and measures laws.
How is traceability ensured for regulatory audits?
Each test record includes immutable metadata: serial number, firmware version, calibration ID, operator code, and UTC timestamp—exportable in audit-ready formats.
What maintenance is required beyond routine cleaning?
Annual verification by an authorized DICKEY-john service center is recommended; no consumables or periodic sensor replacement is needed.