Table of Contents
Advertisement
14. PUMP CALIBRATION PROCEDURE
The calibration of the pump must be performed every time the syringe, pump tubing, the titrant bottle
or the pH electrode is changed. A pump calibration is recommended before each set of titrations, after
the titrator is left idle for several hours, or once daily.
Note: A pump calibration needs to be done in the desired range and sample size. Pump calibration
is independent of the sample type.
• Press MENU, select Setup and select the corresponding range according to the table below:
• Verify the electrode has been calibrated in 8.30 pH buffer.
• Ensure the pump is primed with the correct titrant for the selected range
20 Titrant or
HI84529-52
Sample preparation: Use a clean pipette, add a precisely measured amount of
Calibration Standard to a clean beaker as indicated 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 for the selected range.
• Press Pump 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.
Unit
Low Range 20 or 50 High Range 20
%l.a.
0.01 to 0.20
°SH
0.4 to 8.9
°D
1.0 to 20.0
°TH
1.1 to 22.2
Low Range 50 Titrant,
Low Range 20 – 1 mL
Low Range 50 – 2 mL
High Range 20 – 10 mL
0.1 to 2.0
4.4 to 88.9
10 to 200
11.1 to 222.2
(HI84529-50
HI84529-51
High Range 20 Titrant).
Low Range
HI84529-55
50 mL
25 mL
15 mL
33
Advertisement
Table of Contents
