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Idiomas disponibles
Idiomas disponibles
Symptom
Channel out
Silver bead does not move freely
in the sample
8.2 Zero calibration
Symptom
Signal not in range - calibration
value very different from last
calibration value
Stability not reached - signal not
stable
8.3 High level calibration
Symptom
Signal not in range - calibration
value very different from last
calibration value
Stability not reached - signal not
stable
Section 9 Instrument storage when not used
General guidelines
When not in use, ensure the instrument is turned OFF by pressing the ON/OFF switch (No. 2 in
Figure 1
on page 8) until the green indicator light is extinguished.
If the instrument is to be stored in an environment where the temperature is likely to be 0°C (32°F) or below, then
to avoid any damage to the instrument make sure there is no liquid inside. Do this by first running warm water
through the instrument and dry by flowing dry air or N
Figure 2
on page 8) to the OFF position.
Short term storage
For short term storage (between measurements or up to a maximum of 6 hours), leave the sample in
the instrument by turning the sample flow valve (No. 2 in
Overnight or weekend storage
When storing the instrument overnight or over a weekend, run clean water through the instrument to
prevent passageways from becoming clogged and then turn the sample flow valve (No. 2 in
on page 8) to the OFF position. Wipe down the outside of the instrument with a clean damp cloth.
Long term storage
For long term storage (more than 1 week), run warm water through the instrument followed by 20 mL
of ethanol (EtOH). Dry by flowing dry air or N
Possible solution
Change LDO spot
Contact Hach Lange service
Perform the monthly cleaning procedure
Possible solution
Open sample flow adjustment valve completely
Calibration gas has too much oxygen, use quality 50 N
Oxygen leaks between reference bottle and instrument. Can be checked by
increasing gas flow rate and checking partial pressure (mbar) decrease
Wait for stability and check N
Presence of liquid on LDO membrane. Check presence of liquid in flow
meter and if so, dry by injecting 20 mL of EtOH then 5 minutes of N
Possible solution
Check your theoretical sample O
If gas bottle calibration, completely open the sample flow adjustment valve
to avoid gas overpressure, hence wrong O
Wait for stability and check reference gas or liquid flow rate
Presence of liquid on LDO membrane. Check presence of liquid in flow
meter and if so, dry by injecting 20 mL of ethanol (EtOH) then 5 minutes of
N
gas
2
C A U T I O N
through it. Then turn the sample flow valve (No. 2 in
2
through the instrument, and then turn the sample flow
2
gas flow rate
2
content and reference configuration
2
concentration
2
Figure 2
on page 8) to the OFF position.
or CO
bottle
2
2
gas
2
Figure 2
English 23
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