Hanna Instruments HI 902 Color, Quick Start Manual

Page: 103 / 248

6-3
TITRATION MODE
6 TITRATION MODE
6.1 Running a Titration
Before beginning a titration, make sure that the following conditions are met:
• At least one pump is properly installed.
• A burette is inserted in the pump and filled with titrant.
• The aspiration tube is inserted in the titrant bottle and primed. The dispensing tube
is over the titration beaker.
• The standard or sample has been carefully weighed / measured into the titration
beaker.
• The electrode(s) and the temperature probe are inserted in the titration beaker.
• The desired method is selected and the parameters are set to the optimal values.
6.1.1 Starting a Titration
To start a new titration, press from the main screen.
When a titration begins:
• The stirrer will turn on (if detected and enabled).
• If the pre-stirring time option is enabled, the sample will be stirred until the set
time elapses (see section 5.5.9 Pre-Titration Stir Time).
• If the pre-titration volume option is enabled, the set volume will be dispensed
(see section 5.5.8 Pre-Titration Volume).
• The titrator will start the analysis and continue to deliver titrant until the end point is
detected or the titration is terminated.
6.1.2 Suspending a Titration
While a titration is in progress, you can temporarily stop it by pressing . The burette
will stop dispensing titrant.
To continue the titration press .
6.1.3 Viewing the Titration Curve
During a titration, the potentiometric curve and the derivative curve (equivalence point only)
can be displayed on the
Titration Graph
screen, by pressing . The titration report ID
is also displayed inside the graph window.
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