28
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
(
O
C
a
C
s
a
L
/
g
m
0
.
0
0
4
o
t
0
.
0
3
3
O
C
a
C
s
a
L
/
g
m
0
0
0
4
o
t
0
0
3
3
O
C
a
C
s
a
L
/
q
e
m
0
.
8
o
t
6
.
0
3
O
C
a
C
s
a
L
/
q
e
m
0
.
0
8
o
t
0
.
6
3
For best accuracy, before taking any measurement, ensure that the pump is calibrated on the
selected range following the “Pump Calibration Procedure” (see page 26).
Note:
Verify that the instrument has been calibrated (pH and pump) before performing any
titrations. An electrode calibration in 8.30 pH buffer is recommended.
• Refer to “Setup Menu” (see page 11) to set up instrument for your measurement.
• Select the corresponding measurement range.
Note
: Before performing a titration in high range dispense roughly 1 mL of titrant in a waste
beaker. This will remove any air bubbles in the tubing. Press
Prime
then
Stop
once the
volume has been delivered.
TITRATION PROCEDURE
Low Range (50 ml) - 30.0 - 400.0 mg/L as CaCO
3
High Range (50 ml) - 300 - 4000 mg/L as CaCO
3
Note:
Failure to use a clean pipette will result in erroneous
readings.
• Put the 50 mL sample in the 100 mL beaker.
• Press
Titrator
.
Note: DO NOT PLACE THE TIP INTO THE SAMPLE BEAKER.
PLACE THE TIP OVER A WASTE BEAKER. A SMALL
AMOUNT OF TITRANT IS DISPENSED WHEN THE
PUMP RESETS.
• Press
Start
to begin a titration.
• Place the stir bar in the beaker and put the beaker in the
minititrator top.
• Place the probe holder on the top of the beaker and secure it
by turning clockwise.
Sample preparation
: Use a clean pipette to add precisely measured amount of sample to a
clean beaker as indicated below: