Apera Instruments Premium ORP5, Manual

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6 ORP Measurement
Press to power on, clean the probe in distilled water and dry it. And place the probe in the
tested solution and stir gently and let it stand still. Read the measurement after comes up and
stays.
7 Notes
1)
Usually there’s no need to calibrate for ORP testing. When used for a long time, users can test
it in 222 mV ORP standard buffer. If the error is big, please calibrate according to the steps in
5.1 to 5.4.
2) The meter has self-diagnosis function. Please refer to the followed chart for detailed
information.
Symbol Self-Diagnosis information How to fix
is pressed before the
measurement becomes stable (smiley
face comes up)
Wait till the smile icon appears and
stays, then short press
8 The cleaning and activation of ORP probes
After long-time use, the surface of the platinum sensor can be contaminated and cause inaccuracy
and slow response time. If that happened, the followed methods can be adopted to clean and
activate:
a) For contamination caused by inorganic substances, dip the probe into 0.1 mol/L dilute
hydrochloric acid for 30 minutes. Clean it with distilled water, soak it into the KCL storage
solution for 6 hours, and then it will be ready for use again.
b) For contamination caused by organic substances and oiliness, clean the platinum surface with
dishwashing liquid, and wash with distilled water. And then the probe will be ready for use again
after 6 hours’ soaking in the storage solution.
c) If the platinum surface is so severely contaminated that there forms an oxide film, toothpaste
can be used to clean the platinum surface, and then wash it with distilled water. The probe will
be ready for use again after 6 hours’ soaking in the storage solution.
9 Parameter Setting
9.1 Setting chart
Symbol Parameter Setting Contents Code Factory Default
P1 Low value measurement alarm -1000 to 1000 mV -1000
P2 High value measurement alarm -1000 to 1000 mV 1000
P3 Select automatic lock Off
– On
Off
P4 Select backlight Off - 1 - On 1 (1 min auto off)
P5 Select temperature unit
˚C - ˚F ˚C
P6 Restore to Factory Default No
– Yes
No