GuanCe Instruments GEST-122.2 Capacitive Moisture Analyzer for Coke and Carbonaceous Materials
| Brand | GuanCe Instruments |
|---|---|
| Origin | Beijing, China |
| Manufacturer Type | Authorized Distributor |
| Country of Origin | China |
| Model | GEST-122.2 |
| Price | USD 1,750 (excl. tax & shipping) |
Overview
The GuanCe Instruments GEST-122.2 Capacitive Moisture Analyzer is a dedicated benchtop instrument engineered for rapid, non-destructive moisture content determination in coke, calcined petroleum coke, graphite powders, carbon anodes, and other carbonaceous industrial materials. Unlike resistivity-based systems, the GEST-122.2 employs high-frequency capacitive dielectric sensing (operating at 1–10 MHz), where moisture-induced changes in the material’s complex permittivity (ε′ and ε″) are quantified and correlated to gravimetric water content via factory-calibrated, matrix-specific algorithms. This principle ensures high sensitivity to bound and free water within porous carbon matrices without requiring sample drying, grinding, or chemical reagents — critical for maintaining sample integrity in QC/QA workflows across metallurgical coke production, aluminum anode manufacturing, and battery-grade carbon material processing.
Key Features
- Capacitive dielectric measurement architecture optimized for low-conductivity, high-carbon-content solids (0.1–25% w/w moisture range typical for coke)
- Dual-mode operation: supports both bulk-packed (loose-fill) and compressed pellet configurations via interchangeable sample cups and pressure fixtures
- Integrated temperature-compensated sensor array with ±0.3°C internal thermal monitoring to minimize drift during ambient fluctuations
- 7-inch industrial-grade resistive touch display with intuitive GUI; supports multilingual interface (English default)
- Onboard data logging (up to 10,000 records) with timestamp, operator ID, and environmental metadata (temperature/humidity)
- RS-232 and USB-B ports for external printer connectivity and PC-based data export (CSV/Excel-compatible)
- Modular mechanical design compliant with IEC 61000-6-2 (EMC immunity) and IP20 enclosure rating for laboratory environments
Sample Compatibility & Compliance
The GEST-122.2 is validated for use with ASTM D3173 (moisture in coal and coke), ISO 589:2020 (solid mineral fuels — determination of moisture), and GB/T 2007.6–2017 (methods for sampling and testing of iron ore — part 6: determination of moisture). It accommodates particle size distributions from <106 µm (powdered coke fines) to 25 mm nominal top size (lump coke), provided samples are homogenized and loaded within defined density tolerances (0.45–0.75 g/cm³ for loose fill). Calibration traceability is maintained per ISO/IEC 17025 requirements through annual verification using NIST-traceable moisture reference standards (e.g., potassium hydrogen phthalate saturated salt solutions and certified coke CRM batches).
Software & Data Management
Firmware v3.2 includes audit-trail functionality compliant with GLP and GMP documentation practices: all calibration events, user logins, method modifications, and result exports are time-stamped and non-erasable. The embedded database supports user-defined test methods with configurable pass/fail limits, statistical control charts (X̄-R), and automated report generation meeting FDA 21 CFR Part 11 readiness (electronic signatures enabled via optional USB keyboard authentication). Raw capacitance-phase data is retained alongside final moisture values, enabling retrospective uncertainty analysis per GUM (JCGM 100:2018).
Applications
- Real-time moisture verification of calcined petroleum coke prior to anode paste mixing in aluminum smelters
- Incoming raw material inspection of metallurgical coke at blast furnace feedstock yards
- Batch release testing of graphite powders used in lithium-ion battery anode slurries
- Process stability monitoring during coke drying kiln commissioning and optimization
- Research-grade correlation studies between dielectric response, pore structure (BET), and hygroscopicity in activated carbons
FAQ
Does the GEST-122.2 measure total moisture or only surface moisture?
It measures total moisture content — including adsorbed, capillary, and interstitial water — by penetrating electromagnetic fields into the bulk sample volume (effective depth ~12–18 mm depending on density and frequency setting).
Can it be calibrated for custom coke blends not covered in factory curves?
Yes. The instrument supports user-defined calibration using up to 8 gravimetric reference points (ASTM D3173 oven-dry method), with polynomial or spline interpolation options.
Is periodic recalibration required, and what is the recommended interval?
Annual full-system verification is recommended; however, daily zero-point validation using dry reference cups and quarterly multi-point checks against CRM materials are advised for regulated environments.
How does temperature variation affect measurement accuracy?
Internal thermal compensation corrects for sensor drift; however, sample temperature should remain within 15–35°C during analysis to maintain algorithm validity — outside this range, results require manual correction per published temperature coefficients.
What maintenance is required beyond routine cleaning?
No consumables or moving parts exist; only periodic verification of electrode surface integrity and recalibration after physical impact or exposure to condensation.
