METTLER TOLEDO LE4002E Precision Balance
| Brand | METTLER TOLEDO |
|---|---|
| Origin | Shanghai, China |
| Model | LE4002E |
| Type | Precision Balance |
| Max Capacity | 4200.0 g |
| Readability | 0.01 g |
| Repeatability | 0.01 g |
| Calibration | External |
| Pan Size | 180.0 mm |
| Power Supply | AC Mains |
Overview
The METTLER TOLEDO LE4002E Precision Balance is an entry-level analytical-grade instrument engineered for reliable mass measurement in routine laboratory, educational, and quality control environments. Built upon METTLER TOLEDO’s legacy of electromagnetic force compensation (EMFC) transducer technology, the LE4002E delivers stable, drift-compensated weighing performance across variable ambient conditions. Unlike strain-gauge-based platforms, EMFC ensures linear response, high long-term stability, and minimal temperature-induced error—critical for applications requiring consistent repeatability at 0.01 g readability. With a maximum capacity of 4200.0 g and optimized mechanical damping, the balance supports both rapid stabilization (<2 s typical) and robust handling of bulk samples without compromising metrological integrity. Designed for ISO/IEC 17025-aligned workflows, it meets fundamental requirements for traceable mass determination under GLP and basic GMP settings where full 21 CFR Part 11 compliance is not mandated.
Key Features
- Electromagnetic force compensation (EMFC) sensor architecture for high linearity, low hysteresis, and superior long-term calibration retention
- External calibration capability using certified weights (e.g., Class M2 or better), supporting periodic verification per ISO 9001 and ISO/IEC 17025 internal audit protocols
- 180.0 mm stainless-steel weighing pan with raised rim for spill containment and ease of cleaning—compatible with standard lab gloves and common solvents
- AC-powered operation with integrated power supply filtering to minimize noise-induced fluctuations in shared lab circuits
- Intuitive single-button interface with backlight LCD display; no touchscreen or firmware-dependent navigation—ensuring operational continuity during software updates or IT policy changes
- Auto-zero tracking and drift compensation algorithms activated during idle periods to maintain baseline stability between weighings
Sample Compatibility & Compliance
The LE4002E accommodates a broad range of sample forms—including powders, granules, liquids in containers, and solid components—within its 4200.0 g capacity limit. Its open-frame design allows compatibility with draft shields (sold separately) for low-mass measurements sensitive to air currents. While not certified for hazardous area use (ATEX/IECEx), the unit complies with IEC 61010-1:2010 for electrical safety in laboratory equipment and meets EMC directive 2014/30/EU for radiated and conducted emissions. It supports documentation traceability through manual log entries and is routinely deployed in environments adhering to ASTM E898–22 (Standard Guide for Selection and Use of Laboratory Balances) and USP general chapter on balances used in pharmaceutical testing.
Software & Data Management
The LE4002E operates as a standalone instrument with no embedded data logging or USB/RS232 connectivity. All measurement outputs are displayed locally only, requiring manual transcription or integration via third-party serial capture tools (e.g., LabTutor, Tera Term). This architecture intentionally avoids regulatory complexity associated with electronic records, making it suitable for labs maintaining paper-based SOPs or those undergoing initial GLP implementation. For facilities requiring digital audit trails, METTLER TOLEDO recommends pairing the LE4002E with optional RS232-to-USB adapters and validated data acquisition software compliant with FDA 21 CFR Part 11 Annex 11 requirements—though such configuration falls outside the device’s factory specification.
Applications
- Routine formulation checks in chemical synthesis labs where batch consistency depends on ±0.01 g repeatability
- Raw material receipt inspection in food manufacturing, aligned with Codex Alimentarius weight tolerance guidelines
- Student laboratory exercises in university chemistry and physics courses emphasizing measurement uncertainty fundamentals
- Pre-weighing of standards prior to HPLC or titration workflows where gross mass accuracy—not microgram resolution—is required
- Inventory management of consumables (e.g., filters, vials, reagent kits) in core facilities with high throughput and moderate precision demands
FAQ
Is the LE4002E suitable for ISO/IEC 17025 accredited laboratories?
Yes—provided external calibration is performed at defined intervals using traceable standards, and environmental conditions (temperature stability, vibration isolation) meet Clause 6.4 requirements.
Does this balance support internal calibration?
No—the LE4002E requires external calibration with certified weights; it lacks motorized internal calibration mass or automatic self-adjustment routines.
Can the LE4002E be connected to a LIMS or ELN system?
Not natively. Integration requires external serial interface hardware and validation of the complete data chain by the end user per ALCOA+ principles.
What is the recommended recalibration frequency?
Per METTLER TOLEDO Application Note AN1012, daily zero-check and weekly full-range verification are advised for routine QC use; formal recalibration every 3–6 months depending on usage intensity and risk assessment.
Is the weighing pan removable for cleaning?
Yes—the 180.0 mm stainless-steel pan is tool-free detachable and autoclavable up to 121°C for decontamination in biosafety-sensitive environments.
