6
the electrode to see if the electrolyte in the electrode is run out. If yes, please fill the electrolyte and make
the new calibration.
Electrode Cleaning Techniques
When your pH or ORP electrode gets slow, fouled and coated with contaminants, there are several things
that you can do to restore performance. The reason for this is that the sensing glass membrane becomes
coated. These coatings range from organics such as oil, grease, proteins to metal ions or other
contaminants. Removing them usually requires soaking or washing in a solution which will remove the
coating; similar to cleaning your eyeglasses.
a) Cleaning metal ions, some proteins and organics
Soaking the electrode in 0.01N. HCl for 10-20 minutes. Follow this by soaking in pH electrode storage solution
for 1-2 hours. Rinse the electrode in deionized water, as usual, and recalibrate.
b) Cleaning grease and oils
Washing with acetone or methanol and then warm tap water and dishwashing liquid. Use care if cleaning
mechanically as the pH or ORP glass is fragile. Electrodes washed in this manner also need to be
conditioned by storing in pH/ORP electrode storage solution and recalibrated.
c) Salt Build-Up
Salt crystals can accumulate when water in a salt solution evaporates during contact with air. These salt
crystals can be removed by rinsing the area with warm water.
TROUBLE SHOOTING
Q1: pH display erratic readings or calibration errors??
A1:
Air Bubble in Glass Bulb
During shipment, horizontal storage, and from general use, sometimes
allowing air bubbles into the glass Bulb. Before each use, it is recommended
to inspect that the glass bulb is no visible air bubbles.If there are, shake the
electrode in a downward motion to force air bubbles out of the glass bulb.
Dirty Glass Bulb
Some contaminants remain on the glass surface. Refer to page 9 for specific guidelines for the
most suitable cleaning solution for the specific contamination you have.
Un-plugged the electrode
The readings keep changing on the screen are not referable.
Q2: Wrong temperature??
A2:
Refer to page 4 (
pH TEMPERATURE PROBE TYPE
), you must select the correct temperature sensor
type or adjust temperature manually (Long press
UNIT
button then press
UNIT
to select “
not
”).
Q3: Appear “Error codes”??
A3:
Make sure if Hold is appeared on LCD.
ERROR CODES
Code
Description
- - -
The electrode was not in a solution. Dashes in the temp. mode indicates that probe without
ATC or manual temp. setting. The electrode of cond. measured in pure water or ultra-pure water.
Select the wrong temp. electrode type (refer to page 4).
OL2
Measurement is out of range of the display.