Proton ® PEM

NEL Proton Hydrogen generators are based on the most advanced Water electrolysis technology – Proton Exchange Membrane (PEM). MVS in partnership with NEL (Norway) brings these safe, compact, reliable and easy to operate water electrolysis hydrogen generators for our customers in India and other markets.

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Flow Range

In partnership with NEL, we offer the following models of Proton Hydrogen generators:

  • S-Series – Up to 1 nm3/hr
  • H-Series – 2 to 6 nm3/hr
  • C-Series – 10 to 30 nm3/hr
  • M-Series – 50 to 400 nm3/hr

Hydrogen Purity

NEL Proton PEM Hydrogen generators deliver Hydrogen of 99.9995% or better.


Dew Point

NEL Proton PEM generators deliver very dry gas, with dew point of (-) 65°C or lower.



S-Series and H-Series offer standard delivery pressure of 15-bar, while the larger C-Series delivers Hydrogen at 30-bar standard pressure.

MVS Hydrogen Generators

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A proton exchange membrane (PEM) electrolysis cell is a device which produces hydrogen and oxygen gas by using DC electricity to electrochemically split water. The cell is named for the electrolyte, which is a solid conductive polymer.
In the electrolysis cell, the water enters the anode and is split into protons, electrons and oxygen gas. The protons are conducted through the membrane while the electrons pass through the electrical circuit. At the cathode, the protons and electrons recombine to form hydrogen gas. The electrolysis half-reactions are shown below.

2H2O→4H++ 4e + O2

4H++ 4e→2H2

A PEM cell contains an “active area” in which the presence of catalyst permits the reactions to take place. The structure of the active area of PEM cells consists of the membrane, the anode and cathode catalyst, and the anode and cathode flow fields. The flow fields distribute the flow of reactants and permit the products to exit. In practical implementations, individual electrolysis cells are assembled into stacks of cells. When these cells are stacked in a bipolar arrangement, the anode of one cell is adjacent to the cathode of the next cell. The anode of one cell is electrically connected to but fluidically isolated from the cathode of the next cell. In this way, the cells are electrically in series while the fluids follow a parallel circuit within the stack. The electrolysis stack is typically water-cooled by circulating excess reactant water through the cells.


MVS has technical collaboration with NEL Proton OnSite for Proton Exchange Membrane type most advanced Hydrogen generators in the market. NEL’s Proton PEM Hydrogen generators are the market leader in this technology having sold in excess of 2500 systems worldwide. On the Indian sub-continent, MVS and Proton together have supplied over 50 systems.


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MVS Engineering


A unique capability of Proton’s PEM electrolysis cell design is the ability to generate hydrogen within the cell cathode at significantly elevated differential pressure over the oxygen anode, simultaneously generating pressurized hydrogen and near-ambient pressure oxygen within the same device. Proton’s differential pressure PEM cell attributes greatly simplify the overall system architecture – eliminating large gas volumes, liquid KOH gas scrubbers, H2-in-O2 gas recombination devices, high pressure oxygen hazards, and complex pressure equalization controls.

Proton’s H2 generators comply with applicable EU and North American mechanical and electrical standards; each model carries CE and North American quality marks. The HOGEN C-series is the first to be listed to the international water electrolyzer standard ISO 22734-1.

All NEL Proton PEM commercial hydrogen generators are designed and test-verified to be installed in ventilated, non-classified areas and to not cause the area to become classified. This is accomplished by virtue of an extremely low internal inventory of hydrogen that is well below any safety code minimum quantity requiring a control area. Hydrogen is first contained within process piping and then secondary containment of a ventilated and diluting generator enclosure.


Proton S-SeriesProton H-SeriesProton C-SeriesProton M-Series
0.265 to 1 nm3/hr2 to 6 nm3/hr10 to 30 nm3/hr50 to 400 nm3/hr
15 kg/cm2g15 kg/cm2g30 kg/cm2g15 or 30 kg/cm2g
MVS Engineering
MVS Engineering


Water Electrolysis Hydrogen Generators are used in:

  • Power plants Generator cooling
  • Gas chromatography
  • Semiconductor manufacturing
  • Meteorological (Weather) balloons filling
  • Metallurgical processing (annealing, brightening, sintering)
  • Hydrogenation of fats (food processing)
  • Leak detection in air conditioning industry
  • Chemicals processing
  • Refineries and Pilot plants
  • Chemical Vapour Deposition (CVD) for diamond industry
MVS Engineering
MVS Engineering

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