Hongweiliangzi HW-CXW Automated Crude Fiber Analyzer

Overview

The Hongweiliangzi HW-CXW Automated Crude Fiber Analyzer is a fully integrated, benchtop laboratory instrument engineered for precise and reproducible determination of crude fiber, detergent fiber fractions (NDF, ADF, ADL), cellulose, hemicellulose, and lignin in agricultural and food matrices. It implements the classical acid-base digestion methodology—aligned with AOAC Official Methods 978.10 and 962.09—as well as standardized Chinese national methods GB/T 5515 (crude fiber) and GB/T 6434 (crude fiber in feedstuffs). The system automates sequential acid hydrolysis (H₂SO₄), alkaline saponification (NaOH), solvent rinsing, vacuum filtration, and high-efficiency drying steps within a closed-loop thermal and fluidic architecture. Unlike manual or semi-automated systems, the HW-CXW eliminates operator-dependent variability through programmable reagent dosing, real-time temperature monitoring, and pressure-regulated filtration control—ensuring compliance with GLP documentation requirements and enabling traceable, auditable workflows.

Key Features

• Integrated silicon carbide semi-circular heating modules deliver rapid thermal response and stable temperature uniformity across all six digestion vessels (±0.1 °C setpoint accuracy).
• Corrosion-resistant valve island manifold replaces mechanical switches, enabling precise, pulse-free reagent delivery (H₂SO₄, NaOH, acetone) and eliminating cross-contamination risks.
• Dual-pump architecture: high-vacuum corrosion-rated diaphragm pump for filtration (≥80 kPa suction) + built-in reverse-air blowback pump to disrupt filter cake formation and restore consistent flow rates during NDF/ADF filtration.
• Externally mounted pre-heating reservoir for acid and alkali reagents reduces total cycle time by up to 25% while minimizing thermal shock to digestion vessels.
• Intelligent liquid management system includes overflow detection, level-sensing feedback loops, and automatic shut-off to prevent hazardous spills of concentrated corrosive solutions.
• 7-inch capacitive touchscreen interface with dynamic UI supports multilingual operation (English default), step-by-step protocol guidance, and real-time status visualization (temperature, pressure, elapsed time, remaining steps).
• Modular design complies with IEC 61000-6-3 (EMC) and IEC 61010-1 (safety for laboratory equipment), including double-insulated heating circuits and grounded solvent containment trays.

Sample Compatibility & Compliance

The HW-CXW accommodates solid, ground, or homogenized samples from diverse botanical sources—including forage grasses, cereal grains, soybean meal, distillers’ dried grains (DDGS), bakery by-products, and processed pet foods. Sample mass ranges from 0.5 g to 3.0 g per crucible (standardized Gooch-type sintered glass crucibles, porosity grade G3). All analytical outputs meet statutory reporting requirements under GB/T 5515–2022 (crude fiber in cereals and pulses) and GB/T 6434–2022 (crude fiber in compound feeds). Method equivalence to AOAC 978.10 (crude fiber) and AOAC 962.09 (acid detergent fiber) is verified via inter-laboratory validation studies conducted per ISO/IEC 17025:2017 clause 7.2.2. Instrument firmware supports audit trail logging (user ID, timestamp, parameter changes) compliant with FDA 21 CFR Part 11 when connected to a validated LIMS environment.

Software & Data Management

Embedded firmware v3.2 provides local method storage (up to 20 customizable protocols), automatic calculation of dry-matter-corrected results (g/100 g DM), and export-ready CSV output via USB 2.0 port. Optional Ethernet connectivity enables remote monitoring and centralized data aggregation using HL7-compatible middleware. All raw sensor data (temperature logs, pump duty cycles, reagent volumes dispensed) are retained for ≥90 days and can be exported for QA review. Calibration records—including heater verification, pressure transducer zero-offset checks, and gravimetric dispensing validation—are stored separately with digital signatures and version timestamps.

Applications

• Quality assurance laboratories in animal feed manufacturing for routine crude fiber specification compliance (e.g., NRC nutrient profiles).
• Forage testing services performing NDF/ADF analysis to estimate rumen digestibility and net energy values (NEL, NEg).
• Food ingredient suppliers validating fiber content claims on nutrition labels per GB 28050–2011.
• Academic research groups studying plant cell wall composition in breeding programs (e.g., lignin-to-cellulose ratios in bioenergy crops).
• Contract testing labs supporting GLP-compliant regulatory submissions for novel feed additives or functional food ingredients.

FAQ

What digestion methods does the HW-CXW support?
It executes full AOAC 978.10 (crude fiber), AOAC 962.09 (ADF), and AOAC 973.18 (NDF) protocols, plus GB/T 5515 and GB/T 6434, with user-defined modifications to digestion time, temperature, and reagent concentration.
Is the system compatible with automated sample weighing integration?
Yes—RS-232 and optional Mettler Toledo-compatible serial interface allow direct transfer of tared mass values from analytical balances into assay metadata.
How is maintenance access designed for service technicians?
Front-access service panel provides tool-less removal of pump modules, valve manifolds, and heating elements; all consumables (filters, O-rings, tubing) are ISO-standardized and vendor-agnostic.
Does the instrument include validation documentation?
Factory-installed IQ/OQ documentation package is provided, including temperature mapping reports, pressure calibration certificates, and per-vessel repeatability test data.
Can the HW-CXW be used for lignin quantification via acid detergent lignin (ADL) method?
Yes—integrated 72% sulfuric acid digestion mode with controlled cooling and timed oxidation steps meets AOAC 973.17 specifications for ADL determination.