- 17 -
7.3
Clean and activate ORP electrode
After the electrode has been used over a long period of time, the platinum surface will get polluted which
causes inaccurate measurement and slow response. Please refer to the following methods to clean and
activate ORP electrode:
•
In general, soaking the ORP electrode in 222mV for 30 minutes will help activate the ORP sensor
and restore its accuracy.
•
For inorganic pollutant, submerge the electrode in 0.1mol/L dilute hydrochloric acid for 30 minutes,
then wash it in distilled water, then submerge it in the soaking solution for 6 hours.
•
For organic or lipid pollutant, clean the platinum surface with detergent, then wash it in distilled
water, then submerge it in the soaking solution for 6 hours.
•
For heavily polluted platinum surface on which there is oxidation film, polish the platinum surface
with toothpaste, then wash it in distilled water, then submerge it in the 3M soaking solution for 6
hours.
7.4
ORP Parameter Setting
mV and ORP measurement parameter setting Table
Table (5-2)
Prompt mark
Parameter Setting Items
Code
Parameters
P1
Backlight display time setting
bl
0 -1-3-6 min
P2
Auto power off time setting
ac
0 -10-20 min
7.4.1 Backlight display time setting (P1)
Press , the meter enters P1, see details in section 6.6.5
7.4.2 Auto power off time setting (P2)
Short press in P1 mode, the meter enters P2, see details in section 6.6.6
8
Conductivity Measurement
8.1
Preparation
Press to power on, connect the 2301T-S conductivity electrode (See Section 5 for connection
tutorial); the meter will automatically change to conductivity measurement mode.
8.2
Conductivity Calibration:
8.2.1 Short press to enter calibration mode,
cal
flickers on LCD, indicating the meter enters
calibration mode. Rinse off the electrode in pure water and remove excess water, then insert it into the
1413µS standard solution, make a quick stir and then hold it still. When the reading is stabilized and
