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The Maintenance of ORP Probes
After long-time use, the surface of the platinum pin can be contaminated and cause inaccuracy or slow response time.
If that happened, the following methods can be adopted to clean and re-activate the sensor:
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 rinse
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.
Paramet er Setting
Table of Settings
Parameter Setting
1)
When the meter is turned off, long press
to enter parameter setting →short press to switch P01-P02…
→P5. Short Press , parameter flashes → short press to adjust parameter → short press to confirm
→Short press to exit parameter setting and go back to measurement mode.
2)
Auto. Lock (P02)
– Users can set the auto lock time from 5 to 20 seconds. For example, if 10 seconds is set, when
the measured value is stable for more than 10 seconds, the measured value will be automatically locked, and the
HOLD icon will be displayed. Short press to release the lock. When the setting is "Off" , the Auto. lock function
is turned off, that is, the measured value can only be manually locked. Short press to lock or unlock the
measured value. The HOLD icon will be displayed when reading is locked.
3)
Auto. Backlight (P03)
─
Users can set the automatic backlight time for 1 to 8 minutes. For example, if 3 minutes
is set, the backlight will turn off automatically after 3 minutes; when the
“Off” is set, the auto. backlight function will
be turned off, and short press to manually turn the backlight on or off.
4)
Auto. Power off (P04)
─
The auto. power off time can be set to 10 to 20 minutes. For example, if 15 minutes is
set, the meter will automatically shut down after 15 minutes if no operation; when
“Off” is set, the auto. power off
function will be turned off. Long press to manually shut down the meter.
5)
ORP Back to Factory Default (P05)
– Select “Yes” to restore instrument calibration to theoretical value. This
function can be used when instrument does not work well in calibration or measurement. Calibrate and measure
again after setting the instrument back to factory default.
Symbol
Parameter Setting Contents
Content
Factory Default
P1
Temperature Unit
˚C – ˚F
˚F
P2
Select automatic lock
5-20 seconds
– Off
Off
P3
Automatic Backlight Off
1-8 minutes
– Off
1
P4
Automatic Power Off
10-20 minutes
– Off
10
P5
ORP restores back to factory default
On -- Off
Off
