25
PUMP CALIBRA
TION
8. PUMP CALIBRATION
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.
• Verify the electrode has been calibrated in 8.20 pH buffer.
• Ensure the pump is primed with
HI84534-50
titratable acidity titrant.
8.1. PREPARATION
• Use a clean pipette to add exactly 2 mL of
HI84534-55
calibration standard to a clean beaker.
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 the
CAL
key. The instrument displays the date and time of the last electrode calibration
and the last pump calibration.
8.2. PROCEDURE
• Place the dispensing tip over a waste beaker and press
Pump
then
Start
. The pump will
dispense a small amount of titrant when it resets.
• 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.
50 mL
25 mL
15 mL
