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Electrolyser Test Equipment

Electrolyser Test Equipment - ALDAS-Mini

HIOKI E.E. CORPORATION

  • Provides insights into the internal state of the cell during active electrolysis or generation via cell impedance measurement
  • No modifications to the existing system are needed for setup; operates seamlessly alongside existing DC power supplies and electronic loads
  • Simultaneously generates I-V curve and Nyquist plot in real-time, enabling measurement across a wide range of current densities
  • Supports simultaneous measurement of up to 8 cells in a stack, enabling comparison of individual cells under identical conditions
  • High-precision measurements in noisy environments for consistent, reproducible analysis
  • Supports various electrolysis cell types including PEMEC, SOEC, and AWE, as well as fuel cells and cell stacks

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Description Vendor

The HIOKI ALDAS-Mini (Active Line Device Analysis System) is an Electrochemical Impedance Spectroscopy (EIS) measurement system designed for visualizing the dynamic characteristics of electrolysis cells and fuel cells. The system measures impedance (R, X, θ, Z), voltage, and current during active operation, and simultaneously generates real-time I-V curves and Nyquist plots for cell performance analysis and degradation identification. It supports 1 to 8 input channels and operates in both Logging Mode and EIS Mode. The ALDAS-Mini connects to existing DC power supplies and electronic loads without requiring any modifications to the existing system. It supports electrolysis cell types including PEMEC, SOEC, and AWE, as well as fuel cells and cell stacks. The measurement current range is 100 mA to 500 A using the CT6845A sensor, with a maximum of 2000 A achievable depending on the combination of current sensors used. The measurement voltage range is 250 mV to 60 V across a frequency range of 10 mHz to 100 kHz. The system requires a Windows 11 PC (not included) connected via wired LAN.

Use Cases

  • Small electrolysis cell evaluation (1 cm²)
  • Large cell evaluation (100 cm²)
  • Research of electrolysis cell materials
  • Evaluation of material properties under actual operating conditions
  • Cell health analysis throughout its lifecycle to optimize operating conditions

Capabilities

  • Performs EIS measurements over a frequency range of 10 mHz to 100 kHz
  • Measures impedance (R, X, θ, Z), voltage, and current simultaneously
  • Supports 1 to 8 input channels
  • Measurement voltage range of 250 mV to 60 V
  • Measurement current range of 100 mA to 500 A (CT6845A sensor); maximum 2000 A depending on sensor combination
  • Maximum applied measurement signal of 40 Ap-p at 5 V; derating applies for voltages above 5 V
  • Simultaneously displays I-V curve and Nyquist plot in real-time; impedance calculated from measured current and voltage
  • Supports equivalent circuit analysis via export in Scribner ZView® format
  • Enables EIS measurement at high current densities up to 2000 A, allowing evaluation of industrial-scale cells and stacks during actual operation
  • Compatible with PEMEC, SOEC, AWE, and other electrolysis cell types, as well as fuel cells and cell stacks
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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