Hydrogen Reference Electrode HydroFlex

HydroFlex – the Platinum Hydrogen Reference Electrode of Choice

The platinum-hydrogen reference electrode is the first choice to measure potentials conforming to standards. Platinum-hydrogen electrodes are the only reference electrodes that directly measure hydrogen ion activity. When immersed in the measuring solution, it is a so-called indicator electrode.

The hydrogen electrode is made of PTFE, the edging is made of PEEK.
It is 120 mm long – as big as a pen – and thus very handy. The shaft has an outside diameter of 8 mm and a length of 80 mm.
By activating the hydrogen generation cell (cartridge), the hydrogen production is started and the interior of the PTFE-tube is charged with hydrogen until it leaks out of the platinum hydrogen electrode. The voltage is measured at the gold-plated socket in the electrode’s head.
Multimeters for measuring voltage should have an input resistance of 5 MOhm and more.

Our reference electrode is of low-impedance so that shielded cables are not needed.
The HydroFlex can be used up to temperatures of 210°C as long as only the PTFE-shaft is exposed to those temperatures.

The benefits are quite obvious. The electrode provides itself with hydrogen gas by an internal supply which can easily be exchanged. It does not contain any interior electrolyte, thus there is no ion-discharge and no diffusion potential. The HydroFlex is low-maintenance because no electrolyte has to be refilled. It does not contain any heavy metals.
The electrode can be used in concentrated fluoride electrolytes and in strongly acidic or strongly alkaline mediums (pH -2 to 16) because it is made of PTFE.