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Maintenance 21
3
89VP Instruction Manual Section 4: Maintenance
PN 51-389VP January 2013
476 +20 mV at 25°C when used with a saturated KCl/AgCl reference electrode and platinum meas-
u
ring electrode. Some tolerance in mV values is to be expected due to the rather large liquid ref-
erence junction potentials that can arise when measuring this strongly acidic and concentrated
solution. However, if the measuring electrodes are kept clean and in good operating condition,
consistently repeatable calibrations can be carried out using this standard solution.
Cleaning Platinum Electrode
The electrode can be restored to normal operation by simply cleaning the platinum electrode with
baking soda. Polish it by rubbing it with a damp paper towel and baking soda until a bright, shiny
appearance is attained.
4.3.2