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Electrolyser Test Equipment

Electrolyser Test Equipment - ALDAS-α

HIOKI E.E. CORPORATION

  • High-speed EIS measurement
  • Easy connection to existing EC/FC evaluation equipment, reducing wiring complexity and preparation time
  • Source Module applies up to 20.00 A DC — no additional booster power supply required for high current-density evaluations
  • Non-contact current sensor method eliminates temperature drift associated with shunt resistors, enabling high-accuracy measurements at low frequencies below 1 Hz
  • Supports Nyquist plot, Bode plot, and logging plot display modes

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Description Vendor

The HIOKI ALDAS-α (Active Line Device Analysis System) is a high-speed, high-precision Electrochemical Impedance Spectroscopy (EIS) measurement system designed for R&D evaluation of electrolysis cells, fuel cells, and cell stacks. The system measures impedance (R, X, θ, Z), voltage, and current across a frequency range of 10 mHz to 100 kHz, achieving a minimum measurement time of 7.6 minutes under specified fast-mode conditions (10 kHz to 0.01 Hz, 30 points). The Source Module applies up to 20.00 A DC output current, enabling high current-density evaluations without an additional booster power supply. A non-contact current sensor method is used in place of shunt resistors, eliminating temperature drift and ensuring stable, high-accuracy measurements down to low frequencies below 1 Hz. The system supports 1 to 8 input channels depending on configuration and can be connected to existing EC/FC evaluation equipment.

Use Cases

  • Electrolysis cell evaluation
  • Fuel cell evaluation
  • Cell stack impedance evaluation
  • Accelerating R&D of electrolysis cells and fuel cells

Capabilities

  • Performs EIS measurements over a frequency range of 10 mHz to 100 kHz
  • Measures impedance parameters (R, X, θ, Z), voltage, and current simultaneously
  • Supports 1 to 8 input channels depending on Sense Module configuration
  • Operates in constant-current (CC) load mode
  • Source Module delivers output current from ±10 mA to 20.00 A (resolution: 0.01 A), enabling high current-density cell evaluations with a single unit
  • Measurement current range of 400 µA to 50 A achievable depending on the current sensor used
  • Compatible with electrolysis cells, fuel cells, and multi-cell stacks
  • Non-contact current sensor method provides stable, high-accuracy measurements at low frequencies below 1 Hz
HIOKI E.E. CORPORATION Hioki E.E. Corporation, headquartered in Nagano, Japan and a world-class test and measurement equipment manufacturer, has developed a specialized ALDAS series of Electrochemical Impedance Spectroscopy (EIS) measurement systems engineered for the research, development, and operational analysis of hydrogen electrolysis cells and fuel cell stacks. The company's ALDAS-Mini (launched February 2025) is a compact, high-performance solution accelerating R&D by completing impedance scans from 10 kHz to 0.01 Hz in approximately 7.6 minutes across 8 channels simultaneously (versus roughly 30 minutes for typical electrochemical instruments), operating seamlessly alongside cell DC power supplies without requiring system modification, while ALDAS-alpha (launched October 2025) provides high-precision impedance measurements for electrolysis and fuel cell R&D, enabling detailed material-level evaluation of catalysts and polymer electrolyte membranes. Hioki's ALDAS-E, a high-voltage/high-current EIS measurement system for MW-class electrolyzers and large fuel cell stacks (launched March 2026, following delivery to JAXA in February 2024 for water electrolysis and Sabatier reaction research), applies industry-first technology combining impedance measurement with high-precision current measurement, enabling evaluation and monitoring of large-scale water electrolyzers and cell stacks under real operating conditions with up to 3,000 channels and 30 measuring instruments supported. As global hydrogen demand approaches an estimated 100 million tons in 2025 per IEA estimates, Hioki continues expanding its ALDAS product family to help engineers shorten evaluation cycles, optimize operating windows, and support the wider adoption of hydrogen technologies toward carbon neutrality.
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