27
PUMP CALIBRATION PROCEDURE
Low Range (5 mL)
High Range (10 mL)
• Verify the electrode has been calibrated in 8.20 pH buffer.
• Ensure the pump is primed with the correct titrant for the selected range (
HI 84532-50
Low
Range Titrant or
HI 84532-51
High Range Titrant).
Sample preparation:
Using a clean pipette to precisely
add the appropriate amount of
HI 84532-55
Calibration
Standard
to a clean beaker as indicated below:
The calibration of the pump must be performed every time the syringe, pump tube, the titrant
bottle or the pH electrode is changed. It is recommended to perform the pump calibration before
each set of titrations, after the titrator is left idle for several hours, or once daily.
• Press
Menu
, select
Setup
and select the corresponding measurement range according to the
table below:
Note:
Failure to use a clean pipette will result in erroneous
readings.
• Fill the beaker up to the 50 mL mark with the distilled or
deionized water.
• Press
CAL
key. The instrument displays the date and time of
the last electrode calibration, and the last pump calibration.
• Press
Pump
key.
Note: DO NOT PLACE THE DISPENSING TIP INTO THE
CALIBRATION BEAKER, PLACE THE TIP OVER A
WASTE BEAKER. A SMALL AMOUNT OF TITRANT
IS DISPENSED WHEN THE PUMP RESETS.
• Press
Start
, wait for the syringe to refill.
• Place the stir bar in the beaker and put the beaker in the
minititrator top.
e
g
n
a
R
w
o
L
e
g
n
a
R
h
g
i
H
A
C
%
0
0
.
2
o
t
0
1
.
0
A
C
%
0
0
.
0
1
o
t
0
0
.
1
A
T
%
5
3
.
2
o
t
1
1
.
0
A
T
%
2
7
.
1
1
o
t
7
1
.
1
A
M
%
9
0
.
2
o
t
0
1
.
0
A
M
%
7
4
.
0
1
o
t
5
0
.
1
www.
.com
1.800.561.8187
