Hanna Instruments HI 2002, Инструкция по эксплуатации, Страница: 46 / 52

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Storage Procedure
To minimize clogging and ensure a quick response time, protect the ORP sensor by using the storage
cap. Add a few drops of
HI70300 storage solution to the cap to keep the reference junction wetted.
Periodic Maintenance
Inspect the sensor and cable. The cable used for connection to the edge must be intact and with no
points of broken insulation.
The ORP metal surface must be smooth with no scratches. The metal surface can be polished with a
fine‑grained emery cloth or powdered alumina.
Cleaning Procedure
Use diagnostic messages to aid troubleshooting. Several cleaning solutions are available: See pH
cleaning for specific contaminants or use a solvent system capable of dissolving the coating firm.
After performing any of the cleaning procedures, rinse the electrode thoroughly with distilled water,
and refill the reference chamber with fresh electrolyte (not necessary for gel‑filled electrodes) and
soak the electrode in
HI70300 or HI80300 Storage Solution for at least 1 hour before taking
measurements.
Temperature dependence for ORP sensors
The oxidation‑reduction potential (ORP) displayed in mV, is the voltage that results from the
difference in potential between the platinum metal surface and the Ag/AgCl reference electrode. ORP
values are not temperature compensated, although ORP mV can change with temperature (e.g. reference
electrode potential changes and sample equilibrium changes). It is important to report ORP values together
with the reference electrode used and the temperature of measurement.
MAINTENANCE