METTLER TOLEDO PL-E Portable Balance

Overview

The METTLER TOLEDO PL-E Portable Balance is an engineered solution for field-based, mobile, and space-constrained laboratory environments where reliable mass measurement must coexist with operational flexibility. Based on electromagnetic force compensation (EMFC) technology — the industry-standard principle for precision analytical and semi-micro balances — the PL-E series delivers traceable, stable measurements without mechanical levers or knife-edge suspensions. Its compact footprint and lightweight chassis (under 1.5 kg for most variants) enable deployment on portable workbenches, in quality control vans, during field audits, or at remote sampling sites. Designed and manufactured in Switzerland, each unit undergoes factory calibration against certified reference masses traceable to the International System of Units (SI), ensuring compliance with ISO/IEC 17025 requirements for measurement uncertainty management.

Key Features

• True dual-power architecture: Operates seamlessly on either AC mains (via included adapter) or four standard AA alkaline batteries — delivering up to 100 hours of continuous use under typical conditions, with automatic low-battery warning and graceful shutdown to preserve calibration integrity.
• Backlit monochrome LCD display with 18-mm digit height: Optimized for readability under ambient lighting ranging from dim storage rooms to direct sunlight; contrast and brightness are fixed for consistent visual ergonomics across user cohorts.
• Intuitive single-button interface: All primary functions — tare, unit toggle (g, oz, ct, etc.), application selection — are accessible without menu nesting; no touchscreen or firmware updates required, minimizing training overhead and support dependency.
• Stackable enclosure design: Precision-molded housing features interlocking alignment guides and integrated dust seals, allowing vertical stacking of up to five units without risk of mechanical interference or load-cell compression — a critical advantage for shared lab carts or transport crates.
• Robust environmental tolerance: IP42-rated enclosure resists ingress of solid particles ≥1 mm and vertically falling water droplets; operating temperature range: 10–40 °C; relative humidity: 10–80 % RH (non-condensing).

Sample Compatibility & Compliance

The PL-E series supports a wide range of sample containers — including weighing boats, glass vials, plastic cups, and aluminum pans — via its removable stainless-steel pan (diameter: 120 mm). No draft shield is integrated, positioning the PL-E as a general-purpose balance rather than a micro-analytical instrument; users requiring draft protection must deploy external acrylic enclosures compliant with ISO 9001 handling protocols. All models conform to OIML R 76-1 (2006) Class II accuracy specifications for non-automatic weighing instruments. Calibration certificates issued at time of shipment include uncertainty budgets per EURAMET cg-18 guidelines. The device supports GLP-compliant documentation through manual entry of operator ID and sample ID into printed records generated via optional RS-232 or USB-to-serial interface (cable sold separately).

Software & Data Management

While the PL-E operates as a standalone instrument without embedded data logging, it provides real-time serial output (ASCII format) compatible with METTLER TOLEDO’s LabX Lite software (free download) and third-party LIMS platforms. Output includes timestamp (when connected to PC with time-sync enabled), gross/net/tare values, stability flag, and application mode identifier. All communication adheres to standard MT-SICS protocol v2.3, enabling audit-trail generation when paired with validated PC systems meeting FDA 21 CFR Part 11 requirements for electronic records. Firmware remains static post-manufacture — no over-the-air updates — ensuring long-term configuration stability for regulated workflows.

Applications

• Field-based raw material verification in pharmaceutical supply chains, including excipient lot checks prior to warehouse intake.
• In-process weight verification during packaging line setup (e.g., blister pack fill weight sampling, capsule count validation).
• Educational laboratories where students require tactile familiarity with EMFC-based weighing before advancing to analytical balances.
• Environmental monitoring teams performing soil or sediment subsampling in situ, where portability and battery independence outweigh ultra-high resolution needs.
• Maintenance workshops verifying calibration weights, torque wrench components, or small machined parts within ±0.1 g tolerance bands.

FAQ

Is the PL-E suitable for ISO/IEC 17025 accredited testing?
Yes — provided the user implements documented procedures for daily verification using calibrated check weights, maintains environmental logs, and retains calibration certificates with stated uncertainties.
Can the balance be used in a fume hood?
It may be placed inside a fume hood only if airflow is stabilized below 0.2 m/s at the pan surface and the unit is thermally equilibrated for ≥30 minutes prior to use; however, no draft shield is supplied, so results may exhibit increased variability.
Does the PL-E support internal calibration?
No — all PL-E models rely on external calibration using certified weights; internal motorized calibration mechanisms are not implemented in this product tier.
What is the warm-up time before first use?
Minimum 30 minutes after power-on under stable ambient conditions (23 ±2 °C); shorter stabilization applies if the unit was previously operated within the same thermal environment.
Are replacement pans and battery covers available as spare parts?
Yes — genuine METTLER TOLEDO spare parts (P/N: 11121723 for pan; P/N: 11121724 for battery cover) are distributed globally through authorized service centers.