Table of Contents
Advertisement
Section 8 Maintenance
Regular maintenance is necessary for the best accuracy, stabilization time and life of the probe.
Keep the probe in the recommended storage solution between measurements.
8.1 Clean the probe
Clean the probe regularly to remove contamination and to keep the reference junction open.
Symptoms of contamination:
• Incorrect or irregular readings
• Slow stabilization times
• Calibration errors
• Sample material stays on the probe
1. Rinse the probe with deionized water. Use warm (35–45 °C (95–113 °F)) deionized water to
remove storage solution that dries on the probe. Dry the probe body with a lint-free cloth.
2. Soak the glass bulb and reference junction in the applicable cleaning solution for the specified
time. Refer to
Table 1
3. Rinse or soak the probe for 1 minute in deionized water. Dry the probe body with a lint-free cloth.
4. Soak the probe in pH 4 buffer for 20 minutes.
5. Rinse the probe with deionized water. Dry the probe body with a lint-free cloth.
Contamination
General
contamination
Minerals
Fats, grease and oils
Proteins
Wastewater and
organic compounds
Blockage of porous
pin/diaphragm
reference junctions
and
Consumables
on page 15.
Table 1 Cleaning solution
Cleaning solution
Electrode cleaning solution
for regular maintenance
Electrode cleaning solution
for minerals/inorganic
contamination
Electrode cleaning solution
for fats, oils and grease
contamination
Electrode cleaning solution
for proteins/organic
contamination
Electrode cleaning solution,
extra strong
Electrode cleaning solution
for porous pin/diaphragm
reference junctions
Active component
™
KATHON
CG,
®
DECONEX
11
Phosphoric acid
(~10%)
™
KATHON
CG,
®
TRITON
X
Pepsin in HCl
Sodium hypochlorite
Thiourea
Soak time
12–16 hours
10–15 minutes
2 hours maximum
3 hours maximum
5–10 minutes
3 hours with stirring
or until the porous
plug becomes white
English 11
Advertisement
Table of Contents
