A&D HL Series Compact Desktop Balances

Overview

The A&D HL Series Compact Desktop Balances are precision weighing instruments engineered for reliability, portability, and operational efficiency in demanding laboratory, quality control, educational, and light industrial environments. Designed and manufactured in Japan, these balances employ electromagnetic force restoration (EMFR) technology — a proven method delivering high reproducibility, minimal drift, and fast stabilization times across the full capacity range. Unlike strain-gauge-based platforms, EMFR ensures linearity and temperature stability without mechanical wear, making the HL Series particularly suitable for applications requiring consistent traceability and long-term calibration integrity. The series comprises five standardized models (HL-100, HL-200, HL-400, HL-2000, HL-4000), each optimized for distinct weighing tasks — from analytical sample preparation to bulk material verification — while maintaining uniform ergonomics, interface logic, and compliance architecture.

Key Features

• Compact footprint and lightweight design (~500 g), enabling seamless relocation between workstations, field use, or mobile lab setups.
• High-contrast 7-digit LCD display with 12 mm character height for unambiguous reading under varied ambient lighting conditions.
• Dual-power operation: internal rechargeable battery (up to ~200 hours of continuous use) or optional AC adapter — no proprietary power supply required.
• Intelligent power management with programmable auto-off function to conserve energy without compromising workflow continuity.
• IP65-rated enclosure (HL-WP variants): dust-tight and protected against low-pressure water jets, supporting routine cleaning with alcohol wipes or mild disinfectants.
• Stainless steel arc-shaped housing resistant to corrosion, impact, and chemical exposure — compliant with hygiene-critical environments including pharmaceutical cleanrooms and food processing areas.
• Zero-tracking and tare functions with real-time stability indication; overload protection safeguards load cell integrity.

Sample Compatibility & Compliance

The HL Series accommodates diverse sample forms — powders, granules, liquids in containers, small components, and packaged goods — via interchangeable pan configurations (Ø70 mm round pan for HL-100; 136 × 136 mm square pans for all other models). All units comply with international metrological standards including OIML R76-1 (non-automatic weighing instruments) and JIS B 7720-1. HL-WP models meet ISO 14644-1 Class 8 cleanroom compatibility requirements when operated within controlled environments. The balance firmware supports GLP/GMP documentation workflows: time-stamped weight records, operator ID entry (via optional keyboard), and audit-trail-ready data export. While not FDA 21 CFR Part 11–certified out-of-the-box, the system architecture allows integration with validated LIMS or ELN platforms for regulated environments.

Software & Data Management

Data output is supported via RS-232 interface (standard) and optional USB-to-serial adapter for direct connection to PCs or laboratory information systems. A&D’s free WinCT software enables real-time data logging, statistical analysis (mean, SD, CV%), batch reporting, and customizable print templates. All models support standard ASCII transmission protocols (e.g., “S” command for stable weight output), ensuring interoperability with legacy automation scripts and custom Python/Matlab acquisition tools. Internal memory retains up to 99 weight entries with timestamps — accessible via front-panel navigation without external hardware. Firmware updates are performed via serial interface using manufacturer-provided utilities, preserving calibration constants and user settings.

Applications

• Pharmaceutical QC labs: raw material receipt inspection, tablet weight uniformity testing (USP <905>), excipient dispensing.
• Food & beverage production: portion control validation, ingredient formulation, HACCP monitoring checkpoints.
• Academic teaching labs: stoichiometric experiments, density determinations, and introductory metrology training.
• Electronics manufacturing: PCB component counting, solder paste mass verification, ESD-safe benchtop weighing.
• Field service operations: on-site calibration verification, inventory reconciliation, and maintenance log documentation.

FAQ

What is the recommended calibration frequency for HL Series balances?
Annual calibration is advised for general use; however, daily zero checks and periodic verification with certified test weights (e.g., Class M2 or better) are mandatory per ISO/IEC 17025 and internal QA procedures.
Are calibration certificates included with purchase?
No — factory calibration certificates (traceable to NMIJ/JCSS) are available as optional add-ons at time of order. On-site or accredited third-party calibration services can be arranged separately.
Can the HL-100 model weigh samples smaller than 0.01 g?
No — its readability is fixed at 0.01 g. For sub-milligram measurements, consider A&D’s FX or GF series analytical balances (0.001 g readability).
Is the stainless steel pan removable for cleaning?
Yes — the pan is secured with a single central screw and may be detached without tools; reinstallation requires no recalibration.
Does the HL Series support unit conversion (e.g., g → oz, ct)?
Yes — eight built-in units (g, oz, lb, ct, gn, dwt, momme, tola) are selectable via menu; no firmware update required.