Hanna Instruments hi 9141 사용자 설명서
11
11
CALIBRATION
PROBE POLARIZATION
The probe is under polarization with a fixed
voltage of approximately 800 mV.
Probe polarization is essential for stable mea-
surements with the same recurring degree of
accuracy.
With the probe properly polarized, oxygen is
continually "consumed" when it passes
through the sensitive diaphragm and dissolves
in the electrolyte solution contained in the
probe.
If polarization is interrupted, the electrolyte
solution continues to be enriched with oxy-
gen until it reaches an equilibrium with the
surrounding solution.
Whenever measurements are taken with a
non-polarized probe, the oxygen level revealed
is both that of the tested solution as well as
that present in the electrolyte solution. This
reading is incorrect.
The calibration of this instrument is very simple
and is recommended every time the meter is
turned on.
•
The probe is under polarization with a fixed
voltage of approximately 800 mV.
Probe polarization is essential for stable mea-
surements with the same recurring degree of
accuracy.
With the probe properly polarized, oxygen is
continually "consumed" when it passes
through the sensitive diaphragm and dissolves
in the electrolyte solution contained in the
probe.
If polarization is interrupted, the electrolyte
solution continues to be enriched with oxy-
gen until it reaches an equilibrium with the
surrounding solution.
Whenever measurements are taken with a
non-polarized probe, the oxygen level revealed
is both that of the tested solution as well as
that present in the electrolyte solution. This
reading is incorrect.
The calibration of this instrument is very simple
and is recommended every time the meter is
turned on.
•
Make sure the probe is ready for mea-
surements (see page 8), i.e. the mem-
brane cap is filled with electrolyte and the
probe is connected to the meter and prop-
erly polarized.
surements (see page 8), i.e. the mem-
brane cap is filled with electrolyte and the
probe is connected to the meter and prop-
erly polarized.
•
Switch the meter on by pressing the ON/
OFF key and "Cond" appears on the dis-
play to inform that the probe is in auto-
conditioning (polarization) mode.
OFF key and "Cond" appears on the dis-
play to inform that the probe is in auto-
conditioning (polarization) mode.
•
Once the "Cond" disappears, the instru-
ment can be calibrated.
ment can be calibrated.
ON/OFF
Untitled-22
12
12
•
For an accurate calibration, it
is recommended to wait for 5
or 10 minutes to ensure pre-
cise conditioning of the probe.
is recommended to wait for 5
or 10 minutes to ensure pre-
cise conditioning of the probe.
•
Remove the protective cap.
•
Press the CAL key. "CAL" appears on the
primary display to indicate that the instru-
ment is in calibration mode.
primary display to indicate that the instru-
ment is in calibration mode.
•
The instrument will automatically standard-
ize itself to the actual saturation value and
after approximately 1 minute will show the
value in ppm corresponding to the maxi-
mum oxygen level soluble in water at that
particular temperature and at the condi-
tions of altitude and salin-
ity previously set. Once the
value in ppm is displayed,
the calibration is com-
pleted.
ize itself to the actual saturation value and
after approximately 1 minute will show the
value in ppm corresponding to the maxi-
mum oxygen level soluble in water at that
particular temperature and at the condi-
tions of altitude and salin-
ity previously set. Once the
value in ppm is displayed,
the calibration is com-
pleted.
•
Press the FUNCTION key
and make sure F1 and
F2 are set to the appropri-
ate altitude and salinity val-
ues (see pages 23-24).
and make sure F1 and
F2 are set to the appropri-
ate altitude and salinity val-
ues (see pages 23-24).
Notes: • The instrument must also be cali-
brated whenever the probe, the mem-
brane or the electrolyte solution are
changed.
brane or the electrolyte solution are
changed.
• If you want to exit
the calibration mode
during the calibra-
tion, press the CAL
key again.
during the calibra-
tion, press the CAL
key again.
CAL
CAL
FUNCTION