METTLER TOLEDO MS304TS/02 Analytical Balance

Overview

The METTLER TOLEDO MS304TS/02 Analytical Balance is a high-precision weighing instrument engineered for demanding laboratory environments where accuracy, traceability, and operational robustness are critical. Operating on electromagnetic force compensation (EMFC) principle, it delivers stable, drift-compensated measurements with 0.1 mg readability across its 320 g maximum capacity. Designed and manufactured in Switzerland, the balance integrates advanced metrological safeguards—including FACT (Fully Automatic Calibration Technology) and LevelControl—to ensure measurement integrity under variable environmental conditions. Its die-cast aluminum housing provides mechanical stability and thermal inertia, minimizing sensitivity to ambient temperature fluctuations. The MS304TS/02 meets fundamental requirements of ISO/IEC 17025, USP , and EU GMP Annex 11 for analytical instrumentation used in regulated quality control and R&D workflows.

Key Features

• FACT internal calibration system with automatic temperature-triggered recalibration—ensures long-term accuracy without manual intervention
• LevelControl real-time leveling assistant: graphical on-screen guidance and audible alert when imbalance exceeds tolerance, enabling rapid correction within seconds
• MinWeigh functionality compliant with USP and Ph. Eur. 2.2.17—dynamically calculates and enforces minimum sample weight thresholds; visual red-alert indication when net sample falls below defined limit
• 7-inch full-color capacitive touchscreen with glove-compatible operation (tested with cotton, silicone, and nitrile gloves); 18-mm digit height enhances legibility during routine weighing tasks
• QuickLock draft shield mechanism—tool-free removal and dishwasher-safe components simplify cleaning and reduce cross-contamination risk
• Password-protected configuration mode prevents unauthorized modification of calibration parameters, units, or application settings—supports ALCOA+ data integrity principles
• Four-field sample ID entry via touchscreen or integrated barcode scanner (optional)—enables simultaneous capture of user, sample ID, batch number, and location for full audit trail compliance

Sample Compatibility & Compliance

The MS304TS/02 accommodates standard analytical vessels including weighing boats, crucibles, vials, and filtration assemblies up to 90 mm diameter. Its optimized draft shield design minimizes air current interference while maintaining accessibility for pipetting and micro-spatula handling. The balance supports Good Laboratory Practice (GLP) and Good Manufacturing Practice (GMP) documentation requirements through built-in metadata stamping (date/time/user/sample ID) on all printed or exported records. It is compatible with METTLER TOLEDO’s LabX software for full 21 CFR Part 11 compliance—including electronic signatures, role-based access control, and immutable audit trails. All firmware and calibration certificates are traceable to national metrology institutes (e.g., METAS, NIST), satisfying ISO/IEC 17025 clause 6.5.2 for equipment verification.

Software & Data Management

The balance features PC Direct mode for plug-and-play data export to Excel or LIMS without proprietary drivers. Standard interfaces include RS232, USB Device (for printer or flash drive), and USB Host (for keyboard or barcode reader). Optional Bluetooth 4.2 enables wireless connection to mobile devices or centralized lab networks. When paired with LabX software, the MS304TS/02 supports automated method execution, real-time SPC charting, and deviation alerts based on predefined process tolerances. All raw weighing data—including timestamps, environmental logs (if external sensor connected), and operator credentials—are stored in encrypted SQLite databases with SHA-256 hashing, ensuring forensic-level data integrity per FDA and EMA expectations.

Applications

• Quantitative preparation of reference standards and working solutions in pharmaceutical QC labs
• Gravimetric analysis of active pharmaceutical ingredients (APIs) per USP
• Weighing of catalysts and reagents in fine chemical synthesis
• Moisture content determination via loss-on-drying protocols
• Sample aliquoting for HPLC, GC, and ICP-MS sample introduction systems
• Calibration of volumetric glassware using density-based mass-to-volume conversion
• Material balance verification in pilot-scale manufacturing batches

FAQ

What does FACT calibration mean, and how often does it occur?
FACT performs automatic internal recalibration triggered by predefined temperature thresholds (±1.5 °C from last calibration point) or at user-defined intervals—no manual weights required.
Is the MS304TS/02 compliant with 21 CFR Part 11?
Yes—when operated with LabX software and configured with electronic signatures, audit trail logging, and secure user authentication.
Can the balance be integrated into an existing LIMS or ERP system?
Yes—via RS232 or USB serial emulation mode using standard ASCII command protocols (e.g., MT-SICS), or through LabX middleware with ODBC/REST API connectivity.
What is the significance of the 0.16 g minimum weight value?
This value represents the smallest sample mass that can be weighed with ≤0.1% relative standard deviation at 95% confidence, as validated per USP using 100 g test load and repeated measurements.
Does the balance support GLP-compliant printouts?
Yes—built-in thermal printer interface supports customizable report templates including balance ID, calibration status, environmental conditions, operator ID, and digital signature fields.