METTLER TOLEDO ME204E Analytical Balance

Overview

The METTLER TOLEDO ME204E Analytical Balance is a high-precision mass measurement instrument engineered for routine laboratory weighing tasks requiring reproducible results at the 0.1 mg readability level. Based on electromagnetic force compensation (EMFC) transduction technology, the ME204E delivers stable and drift-resistant measurements under standard ambient conditions (20–25 °C, ≤60% RH, non-condensing). Its robust mechanical architecture—featuring a die-cast metal base and reinforced polymer housing—ensures long-term stability and resistance to mechanical shock and thermal drift. Designed for ISO/IEC 17025-compliant environments, the ME204E supports traceable mass determination in accordance with OIML R 76 and ASTM E898-22 standards for analytical balances. The balance operates within a defined environmental envelope to maintain metrological integrity, and its internal temperature compensation system actively adjusts for minor thermal fluctuations during extended use.

Key Features

• Electromagnetic force compensation (EMFC) sensor with automatic zero-tracking and dynamic damping control for rapid stabilization (<2 seconds typical settling time)
• Ergonomic front-panel interface with intuitive function keys and large backlit LCD display (128 × 64 pixels) for clear visibility under varied lighting conditions
• One-touch external calibration via compatible Class E2 or better stainless-steel weights (e.g., 100 g or 200 g), compliant with ISO 9001 calibration documentation requirements
• Integrated leveling system with dual front-adjustable feet and built-in bubble level indicator for rapid setup verification
• Removable draft shield with 220 mm effective height and low-profile sliding doors to minimize air turbulence while maintaining operator accessibility
• Stainless-steel weighing pan (90 mm diameter) and chemically resistant housing surfaces facilitate rapid cleaning and decontamination between samples
• RS232 interface for direct connection to PCs or printers; optional USB-to-RS232 adapter available for modern computing environments

Sample Compatibility & Compliance

The ME204E accommodates solid, granular, and low-viscosity liquid samples within its 220 g maximum capacity. Its open-bottom design and low-profile draft shield allow compatibility with standard laboratory glassware—including beakers, volumetric flasks, and crucibles—without compromising repeatability. The balance meets essential regulatory expectations for quality-controlled environments: it supports audit-ready documentation through timestamped weight records and user ID logging when interfaced with compliant LIMS or ELN systems. While not natively 21 CFR Part 11 compliant (lacking electronic signature and full audit trail capabilities), the ME204E can be integrated into GLP/GMP workflows when paired with validated third-party data capture software that enforces role-based access, change control, and electronic record retention per FDA guidance.

Software & Data Management

Data output is ASCII-formatted via RS232 serial protocol, enabling seamless integration with spreadsheet applications, statistical process control (SPC) tools, or custom laboratory informatics platforms. The balance supports configurable print formats (including date/time stamp, unit, and gross/net/tare identifiers) for thermal or dot-matrix printers. Optional METTLER TOLEDO LabX Lite software provides basic data logging, statistical summary generation (mean, SD, CV%), and PDF report export—though advanced features such as method templates, multi-user permissions, or electronic signatures require LabX Professional licensing. All firmware updates are distributed via METTLER TOLEDO’s official support portal and must be applied using authorized service tools to preserve calibration integrity.

Applications

The ME204E serves as a foundational tool across pharmaceutical QC labs (e.g., active pharmaceutical ingredient (API) assay preparation, excipient blending verification), academic chemistry teaching laboratories (stoichiometric calculations, gravimetric analysis), food safety testing (moisture content by loss-on-drying), and environmental sample preparation (filter weighing for particulate matter analysis). Its 0.08 mg repeatability enables reliable detection of mass changes associated with desiccation, oxidation, or solvent evaporation over time—making it suitable for controlled humidity studies when operated inside climate-stabilized enclosures. In educational settings, its tactile feedback, immediate response, and simplified menu structure reduce learning curves for undergraduate students performing first-time quantitative analysis.

FAQ

What calibration weights are required for the ME204E?
A certified Class E2 or higher 100 g or 200 g stainless-steel weight is recommended for routine external calibration. Verification at intermediate points (e.g., 50 g, 150 g) may be performed per internal SOPs.
Is the ME204E suitable for use in a fume hood?
No—operation inside a fume hood is not advised due to airflow-induced instability. It must be installed on a vibration-isolated, level surface away from HVAC vents, doors, and foot traffic.
Does the ME204E have internal calibration capability?
No—the ME204E supports external calibration only. Internal motorized calibration is available on higher-tier models such as the ME204E-ICE or XSR series.
Can the balance be connected to a networked LIMS?
Yes, via RS232-to-Ethernet gateways or serial server devices, provided the receiving system accepts ASCII stream input and implements appropriate parsing logic.
What maintenance is required to ensure long-term accuracy?
Daily cleaning of the pan and draft shield, weekly verification with calibrated weights, and annual full-service calibration by an ISO/IEC 17025-accredited provider are strongly recommended.