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Maintenance 39

mmonium sulfate) will produce a nominal ORP of 476 +20 mV at 25°C when used with a satu-

rated KCl/AgCl reference electrode and platinum measuring electrode. Some tolerance in mV

values is to be expected due to the rather large liquid reference junction potentials which 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

an be carried out using this standard solution.

5.4.2 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.

396P + 396PVP Sensors Instruction Manual Section 5: Maintenance

LIQ_MAN_396P_396PVP August 2013

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Emerson 396P Bedienungsanleitung Seite 45