Hanna Instruments HI 84502 - Manual (Page 10)

10
DOSING PUMP
The dosing pump is based on a valve that automatically moves the titrant between the titrant
bottle and syringe when filling the syringe and between the syringe and sample when
dispensing. A replaceable 5 mL plastic syringe is used to limit the amount of titrant used per test
to ensure the highest possible accuracy. Before a set of titrations, it is necessary to prime the
dosing system.
Note: Once titrations have been completed, the dosing system should be cleaned with deionized
water using the prime feature.
TITRATOR STARTUP
This is a general outline of the steps required to perform a titration. The following topics are
expanded upon in each section that follows.
• Place the instrument on a flat table. Do not place the instrument in direct sun light.
• Connect the power adapter to the instrument.
• Turn the instrument ON using the power switch from the rear panel of the instrument.
• Set up the instrument. See the “Setup Menu” section for details.
• Connect the pH electrode to the instrument.
• Connect the temperature sensor to the instrument.
• Calibrate the pH electrode.
• Connect the tubes and the valve. See the “Dosing Pump Installation” section for the
procedure.
• Remove the titrant bottle cap and replace it with the bottle cap with tubes. Place the titrant
bottle in the appropriate place on the titrator top.
• Prime the syringe. To assure high accuracy, verify there are no air bubbles in the syringe or
tubing.
• Calibrate the pump.
• Prepare the sample.
Note: Different volumes of wine are required based on the concentration. See “Titration
Procedure” for details.
• Run a titration and log sample results.
5) Stirrer and reading status
6) Main reading information
7) pH temperature compensation mode (Manual or Automatic)
8) Temperature reading