METTLER TOLEDO MR304/A Advanced Analytical Balance

Overview

The METTLER TOLEDO MR304/A is a high-performance analytical balance engineered for precision mass measurement in regulated and non-regulated laboratory environments. Utilizing electromagnetic force compensation (EMFC) technology, it delivers traceable, stable, and reproducible results under dynamic operational conditions — from quality control labs in food & beverage manufacturing to R&D facilities requiring strict adherence to pharmacopeial standards. With a maximum capacity of 320 g and certified readability of 0.1 mg, the MR304/A meets the technical definition of an analytical balance per ISO 9001 and USP . Its robust mechanical architecture, combined with advanced environmental compensation algorithms, ensures metrological integrity across temperature fluctuations and minor vibrations commonly encountered in shared lab spaces or production-floor integration.

Key Features

• Fully automatic internal calibration (FACT) with temperature-triggered recalibration — eliminates manual intervention while maintaining long-term accuracy.
• Intuitive 4.5-inch color TFT touchscreen interface with guided leveling wizard and real-time status indicators for immediate system diagnostics.
• IP43-rated enclosure provides protection against dust ingress and water splashes, supporting operation in semi-industrial settings such as QC laboratories adjacent to processing lines.
• Multi-protocol connectivity including RS232, USB-A, USB-C, and Ethernet — enabling seamless integration into PLC-controlled workflows, MES platforms, and LIMS via MT-SICS command language.
• Ergonomic design with seamless stainless-steel pan, rounded edges, and smooth surfaces minimizes particle retention and simplifies cleaning validation per GMP Annex 1 requirements.
• User management system with role-based access control (up to 10 user profiles) supports audit trail generation and compliance with ALCOA+ data integrity principles.

Sample Compatibility & Compliance

The MR304/A accommodates standard analytical sample containers, crucibles, and tare vessels up to 90 mm in diameter. Its optimized draft shield geometry reduces air current interference during low-mass measurements (e.g., active pharmaceutical ingredients below 100 mg). The balance conforms to key international standards: USP for minimum weight determination, ISO/IEC 17025 for testing laboratory competence, and OIML R76 for legal-for-trade applications where enabled by local regulatory approval. While not pre-certified for trade settlement in all jurisdictions, its metrological performance satisfies the repeatability and linearity criteria required for Class I or II verification under national metrology frameworks.

Software & Data Management

Data export and instrument control are supported through METTLER TOLEDO’s LabX™ software (optional), which provides full 21 CFR Part 11 compliance including electronic signatures, audit trails, and secure user authentication. Raw measurement data can be exported in CSV, XML, or PDF formats directly via USB or network connection. Built-in MT-SICS protocol ensures deterministic command-response behavior for automated workflows, including batch weighing, formulation checks, and statistical process control (SPC) data streaming. All timestamps are synchronized to system clock with microsecond resolution, and metadata (operator ID, environment log, calibration history) is embedded within each exported record.

Applications

• Pharmaceutical dosage form development and content uniformity testing per USP .
• Raw material assay and reference standard weighing in accordance with ICH Q5C stability protocols.
• Food allergen threshold verification requiring sub-milligram accuracy and documented traceability.
• Environmental testing labs performing gravimetric analysis of particulate matter (PM2.5/PM10 filters).
• Chemical synthesis monitoring where stoichiometric precision demands ≤0.05% relative uncertainty at 10–100 mg load points.
• Calibration laboratory support for secondary standard dissemination within ISO/IEC 17025-accredited scopes.

FAQ

Is the MR304/A compliant with FDA 21 CFR Part 11?
Yes — when operated with LabX software and configured with appropriate user roles, electronic signatures, and audit trail settings, the system fulfills Part 11 requirements for electronic records and signatures.
What is the minimum weight limit for routine use under USP ?
The typical minimum weight is 160 mg at ±0.1% tolerance, verified using certified test weights traceable to NIST or equivalent NMIs.
Does the balance support external calibration with certified weights?
While FACT enables fully automatic internal calibration, the MR304/A also accepts manual external calibration via user-initiated procedures using Class E2 or better reference masses.
Can the MR304/A be integrated into a Siemens S7 PLC environment?
Yes — via RS232 or Ethernet using MT-SICS ASCII commands, enabling direct read/write functionality for automated batching and recipe execution.
Is the touchscreen display suitable for gloved operation?
The capacitive touchscreen supports operation with standard nitrile or latex gloves; haptic feedback and large icon spacing enhance usability in controlled environments.