DICKEY-john GAC2500I High-Precision Grain and Oil Moisture, Test Weight & Temperature Analyzer

Overview

The Dickey-john GAC2500I is a laboratory-grade, high-precision grain and oilseed analyzer engineered for rapid, non-destructive determination of moisture content, test weight (bulk density), and grain temperature in a single 10-second measurement cycle. It employs a proprietary 149 MHz high-frequency capacitance and conductance sensing architecture—validated under the U.S. Department of Agriculture’s Uniform Grain and Rice Standards Act (UGMA) and certified by the Federal Grain Inspection Service (FGIS). Unlike conventional resistance-based or near-infrared (NIR) instruments, the GAC2500I utilizes dielectric property analysis coupled with precision gravimetric weighing to deliver traceable, method-validated results aligned with ASTM D4959 (Standard Test Method for Moisture in Grain by Microwave Oven Drying) and ISO 712:2022 (Cereals and cereal products — Determination of moisture content — Reference method). Its dual-sensor design integrates a contactless infrared temperature probe capable of stable operation across extreme thermal gradients—from sub-zero frozen grains to freshly harvested hot samples—ensuring consistent calibration integrity without manual thermal equilibration.

Key Features

• Simultaneous triple-parameter output: moisture (% w.b.), test weight (lb/bu or kg/hL), and grain temperature (°C/°F) in ≤10 seconds per sample
• 149 MHz RF dielectric sensing platform with auto-compensated temperature and density correction algorithms
• Integrated high-stability load cell with automatic tare recognition and 250 g nominal sample mass detection
• Non-contact infrared temperature sensor with ±0.5 °C accuracy across 0–45 °C grain temperature range
• Full-color, sunlight-readable capacitive touchscreen interface supporting multi-language firmware (including English, Spanish, Portuguese, and Chinese)
• Dual isolated RS-232 serial interfaces for direct integration with LIMS, ERP, or automated sampling systems
• Onboard calibration management system with over 200 pre-loaded crop-specific calibrations—including corn, soybean, wheat, rice, canola, sunflower, sorghum, barley, oats, flaxseed, peanut, almond, and green coffee
• Fully compliant with USDA/FGIS UGMA certification requirements for official grain inspection and commercial trade settlement

Sample Compatibility & Compliance

The GAC2500I is validated for use with all major agronomic commodities requiring regulatory-grade moisture assessment, including but not limited to cereals (shelled corn, soft red winter wheat, rough rice), oilseeds (soybeans, canola, sunflower, flax), pulses (dry peas, lentils, chickpeas), grass and vegetable seeds (alfalfa, timothy, broccoli), pelleted animal feed, and specialty crops (coffee beans, cocoa nibs, shelled peanuts, blanched almonds). Each calibration curve is developed using statistically representative reference samples dried per AOAC 992.12 (Grains and Oilseeds) and verified against primary oven-dry standards. The instrument meets GLP data integrity requirements through timestamped audit logs, operator ID tracking, and electronic signature support—fully compatible with FDA 21 CFR Part 11–compliant software environments when paired with Dickey-john’s optional GACLink™ Data Management Suite.

Software & Data Management

Firmware v4.2+ supports secure data export via RS-232 to external databases or cloud-hosted platforms. All measurements are stored locally with embedded metadata: date/time stamp, operator ID, calibration ID, ambient conditions, and raw sensor diagnostics. Optional GACLink™ PC software enables advanced calibration development, statistical process control (SPC) charting, batch reporting (PDF/CSV), and remote firmware updates. Audit trails comply with ISO/IEC 17025:2017 clause 7.7 (Results Reporting) and support internal quality audits under GMP or HACCP frameworks. No proprietary drivers or dongles required—standard virtual COM port configuration ensures plug-and-play compatibility with Windows/Linux-based laboratory informatics systems.

Applications

• Grain elevator and terminal QA/QC labs performing official moisture verification prior to purchase, sale, or storage
• Seed certification agencies conducting lot-level moisture compliance testing per ISTA Rule 4.2
• Food ingredient processors validating incoming oilseed moisture for extraction yield optimization
• Agricultural research stations developing drought-tolerant cultivars requiring high-throughput phenotyping of seed moisture dynamics
• Feed mills monitoring pelleted feed stability and preventing mycotoxin risk associated with elevated moisture
• Export documentation labs generating USDA-certified moisture reports for international phytosanitary certificates

FAQ

Does the GAC2500I require daily calibration verification?
No—routine verification is performed using NIST-traceable reference standards (e.g., Dickey-john Certified Moisture Kits) at start-up and after every 50 samples; full recalibration is recommended annually or after mechanical shock.
Can the instrument measure frozen grain without thawing?
Yes—the non-contact IR sensor and dielectric compensation algorithm enable accurate moisture reading on grain as cold as –10 °C, provided surface frost is absent and sample mass remains within tolerance.
Is the GAC2500I suitable for regulatory submission to USDA FGIS or Canadian Grain Commission?
Yes—it operates exclusively on UGMA-certified methodologies and is listed on the FGIS Approved Equipment List (AEL) for official moisture determination in domestic and export grain transactions.
What maintenance is required beyond routine cleaning?
Annual factory service includes sensor drift validation, load cell linearity check, and RF generator output calibration—documented in ISO/IEC 17025-accredited service report.
How does temperature gradient between ambient and sample affect accuracy?
The system automatically corrects for thermal lag up to 20 °C differential; however, optimal repeatability is achieved when sample temperature falls within 0–45 °C and ambient humidity remains below 95% non-condensing.