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Self-powered threshold detector of the critical voltage of any hydrogen fuel-cell cell

Self-powered threshold detector of the critical voltage of any hydrogen fuel cell cell (H2 FC), with isolated contact

(threshold adjustable from 0.50V to 2V; stable up to 100°C)

Manufactured in a resistant and waterproof mini-case.

This very low voltage threshold DETECTOR (self-powered detector) is useful both during research and operation, to monitor the minimum voltage of certain cells.



Self-powered, from cell voltage ≥ 0.49V

Self-powered by the voltage (0.49V up to 2V) of the monitored cell, this threshold detector, adjustable from 0.50V to 2V, is a quadrupole which:

  • Provides a “proper functioning” output contact, isolated from its input, itself connected to the cell
  • Eliminates the usual individual auxiliary power supply
  • Frees itself from the variable potential of the electrical ground of each cell, which itself depends on their number and on the current output.

Accuracy of the control threshold chosen between 0.50V and 2V

  • Equipped with an inbuilt adjustment axis (“10 turns” trimmer / Ø 5mm), this mini detector delivers a contact isolated from its input, as long as the monitored voltage exceeds, by at least 5mV, the value of the chosen threshold
  • Factory setting of the threshold, if desired, and better than 1%; this excludes the use of the inbuilt potentiometer

On request: external linear adjustment, as per function  ΔV = 100mV / kW

  • Hysteresis of the selected threshold value: less than 10mV
  • Temperature drift ≤ 0.02% / °C, up to 100°C

Protection and security

  • Protection against accidental reversal of input voltage
  • Protection against shock, vibration, and humidity: by IP67 molding
  • No malfunctions: neither thermal nor at extreme stresses
  • Isolation between the detector input and output: 5000V
  • Increased reliability:
    • no electromagnetic relay
    • no external auxiliary power supply
    • negligible power consumption

Characteristics of the bipolar contact of the inbuilt solid-state relay

  • Maximum transmissible current: ± 100mA
  • Maximum applicable voltage: ± 350V (open contact)
  • Transmissible power: ± 35W
  • Contact resistance :
    • 100 Mega-ohms (open contact)
    • < 40 Ω (closed contact)
  • Power dissipation: 1W
  • Isolation from input: 5000V
  • Response time: < 5ms
  • Mountable in series, for grouped information

Power consumption depending on cell voltage

  • < 60mW, for a voltage ≤ 25V
  • < 125mW, for a voltage up to 2V


  • Storage temperature: from -40°C to +105°C
  • Operating temperature: up to 100°C, easing close implantation of the cells
  • Temperature coefficient: 2.10-4 / °C


EN55022/B; EN60950; CE marking; RoHS

Four presentations, in molded cases 

This threshold detection system is available as a single detector or with two completely separate detectors, and in cases:

  • Clipable on DIN rail
  • Screwable on wall

On request: miniaturization and other variants possible

Please download the datasheet (containing examples of applications and prices) of this product: PDF


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