OHAUS MB27ZH Halogen Moisture Analyzer

Overview

The OHAUS MB27ZH Halogen Moisture Analyzer is a precision-engineered thermal gravimetric instrument designed for rapid, reproducible moisture content determination in solid and semi-solid samples. It operates on the principle of loss-on-drying (LOD), where sample mass is continuously monitored during controlled halogen lamp heating. Unlike conventional infrared or convection ovens, the MB27ZH employs a focused, high-intensity halogen heating element that delivers uniform radiant energy across the sample surface—minimizing thermal gradients and reducing drying time without compromising measurement integrity. The system integrates a high-resolution analytical balance (1 mg readability) with real-time mass tracking and automatic endpoint detection based on mass stabilization criteria. This architecture ensures compliance with standard test methods including ASTM D4442, ISO 15512, and USP <921> for moisture determination, making it suitable for routine QC/QA workflows in regulated environments.

Key Features

• Halogen lamp heating system providing rapid, homogeneous thermal energy transfer—typical drying cycles completed in 3–10 minutes depending on sample matrix
• Integrated analytical balance with 90 g capacity and 1 mg readability, calibrated to internal reference standards
• Compact footprint (17 × 14 × 28 cm) optimized for benchtop deployment in space-constrained laboratories
• Removable, easy-clean stainless-steel heating chamber with smooth internal surfaces and minimal crevice design
• Intuitive single-button operation with pre-programmed drying profiles (Standard, Rapid, Step, and Custom modes)
• Auto-shutoff and overheat protection circuits compliant with IEC 61010-1 safety requirements
• RS232 interface for bidirectional communication with external PCs or LIMS systems

Sample Compatibility & Compliance

The MB27ZH accommodates a wide range of sample types—including powders, granules, pellets, pastes, and thin films—with consistent performance across matrices such as foodstuffs (e.g., flour, dairy powders), pharmaceutical excipients (lactose, microcrystalline cellulose), polymers, and agricultural products. Its 90 mm diameter weighing pan (compatible with OHAUS LB01 aluminum sample dishes, part #30128007) supports uniform sample distribution and optimal heat exposure. The analyzer meets essential regulatory expectations for documentation and traceability: all measurements include timestamped mass/time data logs, and optional software integration enables audit-ready records aligned with GLP and GMP principles. While the MB27ZH itself does not provide 21 CFR Part 11-compliant electronic signatures, its raw data output is fully compatible with validated third-party data management platforms used in FDA-regulated facilities.

Software & Data Management

The MB27ZH operates autonomously via its onboard interface but supports external data capture through RS232 serial output. Users may export time-stamped mass vs. time datasets, final moisture %, dry weight %, and drying curve metadata to CSV or TXT formats. When connected to OHAUS ACX or third-party laboratory software (e.g., LabWare LIMS, Thermo Fisher SampleManager), the instrument feeds structured results directly into centralized databases—enabling batch-level trending, statistical process control (SPC), and automated report generation. All calibration events, user logins (via optional password-enabled firmware upgrade), and method changes are recorded in non-volatile memory, supporting internal quality audits and CAPA investigations.

Applications

• Food & Beverage: Determination of moisture in cereals, spices, coffee beans, and dehydrated fruits per AOAC 950.46
• Pharmaceuticals: Quantification of residual solvents and water content in APIs and finished dosage forms per USP <921>
• Chemicals & Polymers: Monitoring hygroscopicity of catalysts, resins, and battery electrode materials
• Agriculture & Feed: Routine testing of grain moisture for storage stability and compliance with ISO 6540
• Academic Research: Teaching gravimetric analysis principles and method development for novel drying protocols

FAQ

What is the recommended sample preparation procedure for accurate results?
Samples should be homogenized and spread uniformly across the 90 mm aluminum dish to a thickness ≤5 mm. Avoid overloading—maximum sample mass should not exceed 30 g to ensure complete and even drying.
Can the MB27ZH be calibrated for specific materials using custom drying curves?
Yes. The instrument supports up to 10 user-defined methods, each storing temperature ramp profiles, hold times, and endpoint sensitivity settings—ideal for optimizing accuracy across diverse sample chemistries.
Is the LB01 aluminum dish required, or can other pans be used?
The LB01 dish (part #30128007) is strongly recommended due to its precise geometry, thermal mass consistency, and compatibility with the MB27ZH’s auto-zero compensation algorithm. Generic pans may introduce variability in endpoint detection.
Does the MB27ZH meet ISO/IEC 17025 requirements for accredited testing labs?
While the analyzer itself is not certified to ISO/IEC 17025, it is widely employed in accredited laboratories when operated within a documented validation framework—including periodic balance calibration, heating uniformity verification, and method-specific precision/recovery studies.