20
PUMP CALIBRATION PROCEDURE
Attention:
Pump calibration must be performed every time the syringe, pump tube, the titrant bottle
or the ORP electrode is changed. A pump calibration is recommended before each set of titrations or
after the titrator is left idle for several hours.
• Press
MENU
, select
Setup
and 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:
Using a clean pipette to precisely add the appropriate amount of
HI 84500-55 Calibration Standard
to a clean beaker as indicated below:
Note
: Failure to use a clean pipette will result in erroneous readings.
e
g
n
a
R
w
o
L
e
g
n
a
R
h
g
i
H
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
) - 1 ml
High Range (Free & Total SO
2
) - 10 ml
• Fill the beaker up to the 50 mL mark with the distilled or
deionized water.
• 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 sample beaker.
• Press
CAL
key.
Note: DO NOT PLACE THE 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 refill.
• Place the stir bar in the beaker and put the beaker in the
minititrator top.