Precisa prepASH 340 Series Automated Moisture and Ash Analyzer
| Brand | Precisa |
|---|---|
| Origin | Switzerland |
| Model | prepASH 340 Series |
| Temperature Range | 50–1000 °C |
| Weighing Capacity | 120 g |
| Readability | 0.1 mg |
| Sample Throughput | Up to 29 samples per run |
| Programmable Steps | Up to 10 |
| Max Cycle Time | 36 h |
| Gas Options | N₂, O₂, air (0–9 L/min) |
| Compliance | ASTM D3174, D3175, D7582 |
| Software Compliance | FDA 21 CFR Part 11, GLP/GMP-ready audit trail |
Overview
The Precisa prepASH 340 Series is an automated, high-precision moisture and ash analyzer engineered for regulatory-compliant thermal gravimetric analysis (TGA) in industrial quality control and research laboratories. It integrates three traditionally separate instruments—high-temperature muffle furnace, analytical balance, and desiccator—into a single, closed-loop system operating on the principle of sequential thermogravimetry: first drying at controlled low-to-moderate temperatures to quantify moisture loss, followed by controlled oxidation or inert-atmosphere calcination up to 1000 °C to determine volatile matter and fixed residue (ash). This unified architecture eliminates manual handling, inter-instrument transfer errors, and environmental exposure of hot samples—significantly improving repeatability, traceability, and analyst safety. Designed for routine compliance testing across coal, biomass, food, feed, pharmaceutical excipients, and cement raw materials, the prepASH 340 delivers fully automated, unattended operation with real-time mass monitoring and endpoint detection based on programmable mass-loss rate thresholds.
Key Features
- Integrated high-stability microbalance (120 g capacity, 0.1 mg readability) embedded within the furnace chamber enables continuous in-situ weighing during heating—eliminating post-cooling reweighing delays and drift.
- SiC-coated rotating sample carousel ensures uniform thermal distribution across all positions; ceramic crucibles (alumina or silicon carbide) rated for sustained operation at 1000 °C guarantee long-term dimensional stability and chemical inertness.
- Multi-gas manifold supports programmable switching between nitrogen, oxygen, and ambient air—with precise mass flow control (0–9 L/min in 0.1 L/min increments) to accommodate oxidative ashing (e.g., ASTM D3174), inert calcination (e.g., ISO 5984), or sulfur retention protocols (optional H₂SO₄ scrubber).
- 10-step customizable temperature program allows independent ramp rates, dwell times, and atmosphere conditions for each segment—enabling complex multi-phase protocols such as moisture-volatile-ash-sulfate residue sequences.
- Real-time mass-loss kinetics visualization: software displays derivative curves (dm/dt), cumulative mass loss (%), and absolute residual mass (g) for every sample simultaneously during analysis.
- Full 21 CFR Part 11 compliance: electronic signatures, role-based access control, immutable audit trail, automatic backup, and secure user authentication—all validated and documented per IQ/OQ/PQ requirements.
Sample Compatibility & Compliance
The prepASH 340 accommodates standard crucible formats including Precisa’s proprietary 35 mL silicon carbide crucibles (for high-temp robustness), alumina crucibles (for general-purpose ashing), and Conradson-type crucibles (for fine powders and petroleum coke applications). Sample loading is optimized for heterogeneous solids—granular coal, milled biomass, dried foodstuffs, or powdered pharmaceuticals—with minimum sample mass of 0.1 g and maximum load of 120 g per crucible. The system meets the methodological rigor of ASTM D7582 (moisture, ash, and volatile matter in coal), ISO 5982 (ash in animal feeding stuffs), AOAC 942.05 (ash in dairy products), and DIN 51719 (ash in solid fuels). All calibration routines—including balance linearity, temperature uniformity mapping (per ASTM E220), and gas flow verification—are traceable to national standards (NIST, METAS) and support external accreditation (ISO/IEC 17025).
Software & Data Management
The prepDATA software suite provides full lifecycle data governance: method creation, sample registration, real-time remote monitoring (via Ethernet or Wi-Fi), and automated report generation. Reports include GLP-compliant metadata (operator ID, instrument serial number, calibration status, environmental logs), time-stamped mass vs. temperature curves, tabulated % moisture/% ash/% volatile matter with statistical summaries (RSD, confidence intervals), and customizable export to CSV, PDF, or LIMS-compatible XML. Data integrity is enforced through encrypted local storage, scheduled cloud backups, and dual-role approval workflows for method modifications or result overrides. Audit trails record all user actions—including parameter changes, manual interventions, and calibration events—with tamper-proof timestamps and IP logging.
Applications
- Coal and coke analysis: proximate analysis per ASTM D3172/D3174, including moisture, ash, volatile matter, and fixed carbon derivation.
- Biomass characterization: determination of ash content in wood pellets, agricultural residues, and algae feedstocks per ISO 18122 and EN 14774.
- Food and feed quality control: moisture quantification in cereals (AOAC 934.01), ash in dairy powders (AOAC 942.05), and mineral residue in pet food (AAFCO Method 2.2.02).
- Pharmaceutical excipient testing: residual solvents and inorganic impurities screening per USP <281> and Ph. Eur. 2.2.34.
- Cement and mineral processing: LOI (loss on ignition) determination per ASTM C114 and ISO 29581-2 for clinker and blended cements.
FAQ
Does the prepASH 340 require external cooling or desiccation between weighing steps?
No. The integrated balance operates inside the heated chamber, enabling direct in-situ mass measurement before and after each thermal stage—eliminating manual transfer, ambient exposure, and desiccator dependency.
Can the system be validated for GMP environments?
Yes. The prepASH 340 includes full IQ/OQ documentation templates, 21 CFR Part 11-compliant software, and hardware-level security features (e.g., password-protected firmware updates, encrypted data storage) required for regulated pharmaceutical and biotech QA/QC labs.
What crucible types are supported out-of-the-box?
Standard configurations include Precisa silicon carbide crucibles (35 mL); optional accessories enable use of Conradson crucibles (15 mL) and ISO-standard porcelain crucibles.
Is network integration possible for centralized lab management?
Yes. The system features native Ethernet connectivity, supports SNMP monitoring, and integrates with enterprise LIMS via HL7 or ASTM E1384 interfaces—enabling batch scheduling, remote diagnostics, and centralized data aggregation.
How is temperature uniformity verified across the sample carousel?
A certified 9-point temperature mapping procedure (per ASTM E220) is performed during installation qualification, with results documented in the OQ report; annual recalibration includes verification of ±2 °C uniformity across all 29 positions at 500 °C and 900 °C.
