Hanna Instruments HI 904 - Manual (Page 5)

5
QUICK START GUIDE
INTRODUCTION
The HI 904 Karl Fischer Coulometric titrator is extremely flexible, capable of performing a
wide variety of highly accurate and precise water content titration methods.
The HI 904 finds a titration endpoint using a polarized electrode and an advanced detection
algorithm. A constant flow of current is maintained between the two platinum pins of the
titrator’s electrode. When the solution in the titration vessel contains water, a relatively
large voltage is required to maintain the flow of current between the pins. As the titration
proceeds, the water in the sample is consumed by the iodine that is generated electrolytically
within the vessel. At the end point, all of the water has been reacted and the cell contains
excess iodine. The presence of excess iodine within the titration cell results in a reduction
in the amount of voltage required to maintain the constant current between the pins of the
electrode. The endpoint detection algorithm incorporated in the HI 904 analyzes both the
electrode response to individual additions of iodine and the shape of the entire titration
curve in order to determine the endpoint of the titration.
Titration reports and methods can be transferred to a PC via a USB interface, saved to a USB
flash drive or printed directly from the titrator. An external monitor and keyboard can be
attached for added convenience.
How can I find certain information?
1. This Quick Start Guide will help the user learn how to operate the titrator within
a short period of time. The first analysis will be performed with the aid of the
factory stored methods.
2. The Instruction Manual provides a complete description of the operating principles
(user interface, general options, methods, titration mode, maintenance, etc.).
3. The contextual Help screens contain detailed explanations about what kind of data
can be set or viewed in every displayed screen.
4. The Titration Theory booklet outlines the basic concepts of titration.