Zero Calibration - Hach ORBISPHERE 3100 Manuel D'utilisation Simplifié

Symptom
Response time too long
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 9) until the green indicator light is extinguished.
Possible solution
Use tubes supplied with instrument (low O
Check flow rate and connections
Prior to package sampling, purge the piercer with N
Perform the monthly cleaning procedure
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
bottle
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 gas
2
Possible solution
Check your theoretical sample O
configuration
If gas bottle calibration, completely open the sample flow
adjustment valve to avoid gas overpressure, hence wrong O
concentration
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
permeable material)
2
gas flow rate
2
content and reference
2
gas
2
or CO
2 2
2
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