METTLER TOLEDO ME204E Analytical Balance

Overview

The METTLER TOLEDO ME204E Analytical Balance is a high-precision, internal-calibration analytical instrument engineered for routine laboratory weighing tasks requiring consistent 0.1 mg readability and long-term metrological stability. Based on METTLER TOLEDO’s NewClassic ME platform, it employs electromagnetic force compensation (EMFC) technology—where sample weight is counterbalanced by a precisely regulated current through a coil in a permanent magnetic field—to deliver traceable, drift-resistant measurements. Designed as a direct replacement for the AL204 series, the ME204E integrates robust mechanical architecture—including a reinforced metal frame, overload protection rated up to 100 kg, and precision-machined load cell suspension—ensuring durability under daily operational stress. Its compact footprint and ergonomic front-access design facilitate seamless integration into standard fume hoods, laminar flow cabinets, or dedicated balance enclosures. The unit operates within ambient temperature ranges of 10–30 °C and relative humidity up to 80 % RH (non-condensing), meeting environmental requirements for ISO/IEC 17025-accredited testing laboratories.

Key Features

• Internal motorized calibration system with automatic temperature-triggered recalibration—eliminates manual calibration weights and reduces operator dependency.
• Ergonomic front-panel interface with intuitive icon-driven navigation; 10 preprogrammed weighing applications accessible without menu diving.
• Seamless GLP/GMP compliance support: automatic date/time stamping, user ID logging, and audit trail export (via optional LabX™ Lite or full LabX software).
• Dual-level leveling system with front-adjustable leveling feet and integrated bubble level—enables rapid setup and verification on standard lab benches or vibration-isolation tables.
• Hygienic design: fully rounded edges, smooth non-porous surfaces, and removable draft shield components simplify cleaning and minimize particulate retention.
• Stabilization time of ≤2 seconds under standard conditions ensures throughput efficiency in high-volume QC workflows.
• Integrated RS232 and USB interfaces support direct data transfer to LIMS, ELN, or Excel-based reporting systems without intermediate hardware.

Sample Compatibility & Compliance

The ME204E accommodates samples up to 220 g on its Ø90 mm stainless-steel weighing pan. Its draft shield assembly (standard configuration) provides Class I environmental isolation per OIML R 76-1, minimizing convective interference during microgram-level determinations. The balance meets international metrological standards including OIML R 76, NIST Handbook 44 (Class I), and EU Directive 2014/32/EU (MID). For regulated environments, it supports 21 CFR Part 11 compliance when paired with METTLER TOLEDO’s LabX software—enabling electronic signatures, role-based access control, and immutable audit trails. Routine verification protocols align with ASTM E898, USP , and ISO 17025 clause 6.4.10 (equipment suitability assessment).

Software & Data Management

While the ME204E operates autonomously via its built-in firmware, seamless digital integration is achieved through METTLER TOLEDO’s LabX™ software ecosystem. LabX Lite (included) enables basic data capture, report generation, and CSV export. Full LabX deployment unlocks advanced features: automated SOP execution, multi-balance network monitoring, real-time statistical process control (SPC), and electronic record archiving compliant with FDA 21 CFR Part 11 and EU Annex 11. All raw weighing data—including timestamps, operator IDs, calibration logs, and environmental metadata—is structured in XML format for traceability and third-party system ingestion.

Applications

The ME204E serves as a foundational instrument across pharmaceutical QC labs (e.g., active pharmaceutical ingredient (API) assay, excipient blending verification), academic research (gravimetric preparation of standard solutions, catalyst loading), food safety testing (moisture content by loss-on-drying), and materials science (powder density determination, coating mass uniformity). Its 10 embedded applications—including percentage weighing, piece counting, dynamic weighing, formulation, and density determination—support validated workflows without external scripting. The balance is routinely deployed in environments requiring adherence to pharmacopeial methods (USP , EP 2.1.6) and ISO 9001 quality management systems.

FAQ

Does the ME204E require external calibration weights?
No—the built-in motorized internal calibration system performs automatic adjustment using a certified reference mass; external weights are only required for periodic verification or regulatory audits.
Can the ME204E be connected to a laboratory information management system (LIMS)?
Yes—via RS232 or USB, using either ASCII protocol (direct serial output) or LabX middleware for structured data mapping and bidirectional communication.
Is the draft shield included as standard equipment?
Yes—the single-door acrylic draft shield with sliding front panel is supplied as part of the base configuration.
What is the recommended maintenance schedule?
Daily: visual inspection, cleaning, and level verification. Weekly: repeatability test using calibrated check weight. Annually: full metrological verification by an accredited service provider per ISO/IEC 17025.
How does temperature drift affect measurement accuracy?
The sensor exhibits a sensitivity of 2.0 ppm/°C; therefore, maintaining stable ambient temperature (±1 °C) is critical for achieving specified linearity and repeatability over extended operation.