gaskatel Mini-HydroFlex Bedienungsanleitung Seite 21

5. Troubleshooting
Potential is not displayed correctly
Cause 1: poor contacting
Check the test leads on optical damages such as corrosion, cracks, and sessile
plugs. Replace the test leads.
Check the electrode with an external reference electrode, e.g. a calomel or silver
silver chloride electrode (see 0. Checking Mini-HydroFlex).
Cause 2: no or too little hydrogen production
Did you place the new Mini-HydroFlex in water for 24 hours?
If not, wait 24 hours before you measure.
Is the duration of the hydrogen cell exceeded?
If yes, please replace the hydrogen cell (see 4. Maintenance).
Cause 3: slow ion exchange, e.g. when you switch from concentrated solutions to
weak concentrated solutions
Wait the setting time, sometimes the balancing of concentrations lasts longer than
expected. If necessary, check the potential in another electrolyte such as 1 mol/l
hydrochloric acid (see 0. Checking Mini-HydroFlex).
Cause 4: air/oxygen gets to the electrode
Avoid that gases such as air or oxygen reach the hydrogen electrode's shaft. If this
happens the hydrogen is displaced or reacts off. No hydrogen potential can be set.
EN - Page 8
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