Leichi SFS-101S Halogen Moisture Analyzer

Overview

The Leichi SFS-101S Halogen Moisture Analyzer is a precision benchtop instrument engineered for rapid, reproducible determination of moisture content in solid and semi-solid samples using the loss-on-drying (LOD) principle. It employs a high-efficiency circular halogen lamp as the heating source, delivering uniform thermal radiation across the sample surface to minimize thermal gradients and ensure consistent drying kinetics. Unlike infrared or convection-based systems, halogen heating provides faster thermal response, improved energy efficiency, and precise temperature control from ambient up to 180 °C—enabling optimization for thermally sensitive or heterogeneous materials. The integrated analytical balance features dual-range weighing capability (0.2–110 g), with 5 mg readability and 10 mg verification division (e), compliant with OIML R76-1 Class II accuracy requirements for moisture analyzers used in quality control and routine testing environments.

Key Features

• High-resolution 4.3-inch color LCD display with intuitive icon-driven interface for seamless operation without training overhead
• Circular halogen heating system with real-time temperature monitoring and closed-loop thermal regulation
• Multi-mode drying protocols: Standard mode (for method validation), Quick mode (for screening), and customizable time/temperature profiles (0–90 min duration, 1 °C increments)
• Triple endpoint detection logic: Auto-termination based on mass stabilization (±0.005 g/30 s), manual stop, or time-limited termination
• Comprehensive result reporting: Moisture % (w/w), Dry Matter %, ATRO Dry Basis %, and ATRO Wet Basis %—all calculated and displayed simultaneously
• Real-time dynamic display of chamber temperature, elapsed heating time, current mass, and instantaneous moisture loss rate
• Integrated safety interlocks: Audible and visual alerts for lid open detection, over-temperature conditions, and unstable weighing platform
• RS-232 serial port supporting direct connection to standard dot-matrix or thermal printers for GLP-compliant hardcopy records

Sample Compatibility & Compliance

The SFS-101S accommodates a broad spectrum of industrial and laboratory samples—including pharmaceutical granules, food powders, polymers, ceramics, agricultural commodities, and chemical intermediates—provided minimum sample mass (≥1 g) is maintained to ensure statistical representativeness and measurement repeatability. Its plastic heating chamber construction meets IEC 61010-1 safety standards for laboratory electrical equipment. While not intrinsically rated for hazardous locations, the unit complies with CE marking directives (EMC 2014/30/EU, LVD 2014/35/EU) and supports traceable calibration via external weights (class M2 or better). For regulated environments, the device enables audit-ready documentation when paired with validated printer drivers and timestamped output—aligning with foundational expectations of ISO/IEC 17025, USP , and ASTM D4457 (for polymer moisture) workflows.

Software & Data Management

The SFS-101S operates autonomously without PC dependency; however, its RS-232 interface permits integration into centralized data acquisition systems via ASCII protocol. Output includes sample ID (user-definable), start/end timestamps, setpoint temperature, total drying time, initial/final mass, and all four moisture-related percentages. Each record is structured for direct import into LIMS or Excel, supporting batch-level traceability. Though no proprietary software is bundled, the analyzer’s fixed command set (e.g., “READ”, “PRINT”, “CAL”) allows scripting in Python or LabVIEW for automated report generation. All measurements retain internal timestamps synchronized to system clock—critical for FDA 21 CFR Part 11 readiness when combined with procedural controls (e.g., operator login logs, change history tracking via external logbooks).

Applications

• Pharmaceutical QC labs verifying moisture limits per USP for active pharmaceutical ingredients (APIs) and excipients
• Food manufacturing facilities validating shelf-life stability of dried fruits, dairy powders, and cereal blends
• Polymer processors monitoring hygroscopicity of nylon, PET, or ABS resins prior to extrusion or injection molding
• Agricultural testing centers assessing grain moisture for storage compliance (e.g., ISO 6540, ISO 712)
• Research laboratories developing drying kinetic models using time-resolved mass loss curves
• Contract testing organizations performing ASTM E1447 (moisture in coal) or ISO 1189 (plastics) determinations

FAQ

What is the recommended calibration frequency for the SFS-101S?

Calibration should be performed daily before first use using certified test weights (e.g., 10 g and 100 g M2 class), with intermediate checks every 2 hours during extended operation.
Can the SFS-101S measure volatile organic compounds (VOCs) as moisture?

No—it measures total volatile loss under defined thermal conditions. Users must validate method specificity against known standards if VOC interference is suspected.
Is the heating chamber resistant to corrosive samples such as acids or solvents?

The plastic chamber is not chemically resistant; aggressive or solvent-laden samples require pre-treatment or use of disposable aluminum pans to prevent degradation.
Does the instrument support user-defined drying methods with multiple temperature ramps?

No—the SFS-101S supports only single-stage heating profiles. Multi-ramp methods require higher-tier models with programmable thermal modules.
How is measurement repeatability verified?

Repeatability is assessed per ISO 5725-2 using ≥10 replicate measurements of homogeneous reference material (e.g., sodium tartrate dihydrate); typical RSD at 5% moisture level is ≤0.25%.