Free so, Measurement procedure – Hanna Instruments HI 84500 User Manual
Page 21
21
FREE SO
2
MEASUREMENT PROCEDURE
• Refer to “Setup Menu” (see page 10) to set up the instrument for your measurement.
• For best accuracy, before taking any measurement, ensure that the pump is calibrated on the
selected range following the “Pump Calibration Procedure” (see page 19).
• Select the corresponding range according to the table below:
• Ensure the pump is primed with the correct titrant for the selected range (
HI 84500-50 Low
Range Titrant or
HI 84500-51 High Range Titrant).
Sample preparation: Use a clean pipette to precisely add the appropriate amount of wine
sample to a clean 100 mL beaker as indicated below:
e
g
n
a
R
w
o
L
)
e
l
p
m
a
s
L
m
0
5
(
e
g
n
a
R
h
g
i
H
)
e
l
p
m
a
s
L
m
0
5
(
m
p
p
0
.
0
4
o
t
0
.
1
m
p
p
0
0
4
o
t
0
3
Low Range (Free & Total SO
2
) - 50 mL
High Range (Free & Total SO
2
) - 50 mL
Note: •The volume of wine added is critical to the measurement
accuracy. Pipettes are recommended.
•Failure to use a clean pipette will result in erroneous
readings.
• Fill the 20 mL beaker up to the 5 mL mark with the
HI 84500-60
Acid Reagent and add the contents to the 100 mL beaker.
• Add the contents of one packet of
HI 84500-62 Stabilizer
Packet to the 100 mL beaker.
• Press
Titrator.
• This screen appears when the stirrer is not
working properly. Check the stir bar and beaker
content. Press
Restart to try again.
• This error message appears when the pump is
not working properly. Check the tubing, valve
and syringe. Press
Restart to try again.