Pump calibration procedure – Hanna Instruments HI 84431 User Manual
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Verify: The electrode has been calibrated in 8.30 pH buffer.
• Sample prepar.ation: Add a precisely measured amount of
HI 84431-55 Pump Calibration Solution to a clean beaker
as indicated below:
Fill the beaker up to the 50 mL mark with the distilled or
deionized water. Place the stir bar into the beaker and then place
the beaker into the appropriate place on the instrument top.
• Place the electrode holder on the top of the beaker and secure
it by turning clockwise.
• Immerse the calibrated pH and the temperature electrodes
approximatively 2 cm (0.8”) into the sample to be tested
paying attention not to touch the stir bar.
• Verify if the titrant correspondes to selected titration range.
For Low Range (Strong LR, Total LR) use the HI 84431-50.
For High Range (Strong HR, Total HR) use the HI 84431-51.
After the 5 minutes purging interval has elapsed the “Completed” message is displayed.
Another purge period can be initiated by pressing Restart or press ESC to return to main titrator
screen.
PUMP CALIBRATION PROCEDURE
SETUP alkalinity type and purge unit with titrant before performing the pump calibration.
• Select the corresponding range according to the table below.
The pump calibration must be performed each time the alkalinity type, pump tube, titrant bottle
or the pH electrode is changed. It is recommended the pump calibration be performed before
each set of titrations.
T
I
N
U
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
(
L
/
g
m
0
.
0
0
5
o
t
0
.
0
1
0
0
0
4
o
t
0
0
4
L
/
q
e
m
0
.
0
1
o
t
2
.
0
0
8
o
t
8
Low Range (Strong LR, Total LR) - 2 ml
High Range (Strong HR, Total HR) -20 ml