14
DO Polarographic Probe Structure
1 2 3 4 5 6 7
1. Electrode Body
2. Temperature Sensor
3. Screw
4. Sensor; position of response to oxygen
5. Membrane
6. Membrane Cover ;
containing with the filling Solution
7. Membrane Protector
DO Probe Storage
For longer storage, cover the membrane tip with a cap originally supplied by
istek
.
DO Probe M aintenance (Probe Cleaning)
If it takes long time to response or a stable data isn't obtained, check membrane.
If air bubble is occurred on membrane, remove air bubble.
Check membrane for damage(i.e. holes and leak, etc.). If membrane gets damage, replace
membrane.
Conductivity Cell Storage
A dirty cell will contaminate the solution and cause conductivity to change. It is best to
store cells that are immersed in deionized water. Provided the cell has been stored in
condition of drying, should be soaked in distilled water for five to ten minutes before
using to keep electrode wet.
Conductivity Cell M aintenance (Cell Cleaning)
Glease, oil, fingerprints, and other contaminants on the sensing elements can cause
erroneous measurements and sporadic responses.
If it takes long time to response or a stable data isn't obtained, can be often restored to
normal performance by using the following procedures;
Clean cells with detergent and/or dilute nitric acid(1%) by dipping or filling the cell
with cleaning solution and agitating for two or three minutes. Other diluted acids(e.g.
sulfuric, hydrochloric, chromic) may be used for cleaning except for aqua regia. When
a stronger cleaning solution is required, try concentrated hydrochloric acid mixed into
50% isopropanol.
Chapter III General Functions
N eo M et
