Hach Lange ORBISPHERE 3100, Basic User Manual, Page: 23 / 384

High level calibration
Symptom Possible solution
Signal not in range - calibration
value very different from last
calibration value Check your theoretical sample O
2
content and reference configuration
If gas bottle calibration, completely open the sample flow adjustment valve
to avoid gas overpressure, hence wrong O
2
concentration
Stability not reached - signal not
stable 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
2
gas
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.
C A U T I O N
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
2
through it. Then turn the sample flow valve ( No. 8 in
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. 8 in Figure 2 on page 8) to the OFF position.
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. 8 in Figure 2
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
2
through the instrument, and then turn the sample flow
valve ( No. 8 in Figure 2 on page 8) to the OFF position. Wipe down the outside of the instrument with
a clean damp cloth. It is recommended to fully charge the battery prior to any long term storage.
Note: If the instrument has been in storage for more than 4 weeks, remember to fully recharge the battery pack
before use.
English 23