For scientists and professionals who need precise water content determination from 1 ppm to 5%, the HI904 is a reliable Coulometric Karl Fischer titrator that gives results in minutes.

Unlike volumetric Karl Fischer titrators, the HI904 features an precision titrant generation system and a fully sealed titration vessel for unmatched accuracy.

A Better Coulometric Karl Fischer Titrator Experience

Our friendly technical consultants take pride in helping make your titrator selection easy – every step of the way. Our experts are here to guarantee you have a positive experience, from onsite installation and training to customization and continued support.

Schedule a free titration review today!

Coulometric Karl Fischer Titrator Capabilities

Dynamic Titrant Dosing

The dynamic titration speed allows for timely and accurate titration results by relating the amount of iodine generated to the mV response from the Karl Fischer reaction. This provides for a larger generation of iodine near the beginning of a titration and more precise pulses near the titration endpoint.

Drift Rate Compensation

The HI904 Coulometric Karl Fischer Titrator automatically adjusts the titration calculation to account for the effects of any ambient humidity entering the titration cell. This provides a more accurate result by correcting for water not present in the actual sampl

Selectable Endpoint Criteria

The HI904 employs a dual platinum pin electrode for bivoltammetric endpoint determination. Users may choose termination criteria based on mV stability times or drift rates.

Multistage Cell Preparation

A pre-titration stage eliminates residual water present in the solvent and the cell, providing a reliable baseline start to analysis. Standby mode then keeps the solvent dry between titrations and when the titrator is not in use.

Coulometric Titration System

Purposeful Generator Design

Two styles of generators are available for the HI904 Coulometric Karl Fischer Titrator; a fritted design ideal for samples with low water content and high accuracy demand; and a fritless generator allowing for easier cleaning and maintenance.

Precision Iodine Generation

Our dosing algorithm allows for an extremely small amount of iodine necessary for the Karl Fischer reaction to be generated electrolytically using a pulsed current up to 400 mA, delivering iodine accurately and precisely.

Titration & Solvent System

Chemically Resistant Vessel & Tubing

The glass titration cell and PTFE tubing is designed to withstand the harsh solvents and reagents involved in Karl Fischer titration.

Sealed Solvent System

Ground glass joints completely seal the glass titration cell, minimizing exposure to ambient humidity, keeping the system dry, and reducing reagent consumption while saving time between titrations. Solvent may be exchanged in a matter of seconds with a quick fitting adjustment.

High Efficiency Desiccant

High efficiency molecular sieve desiccant helps maintain low and stable drift rates within the titration cell while preventing the ingress of ambient humidity into the sealed solvent system.

Interface & Display

All of your important information is displayed.

Our large color display shows you everything you need to know during testing.

Track your progress in real-time.

Our live titration curve helps you quickly recognize patterns and problems that may arise during your analysis.

Explore titrator menus with ease.

Custom keys allow you to clearly navigate between screens so you don’t get lost.

Titrator Data & Reporting

Highlight your most important information.

Final reports are customizable so you can make sure you are viewing and storing your most important information.

Safeguard the integrity of your data.

Our software allows you to record full GLP (Good Laboratory Practice) data so there is no need to compromise the quality of your results.

Move your information easily across devices.

Use our software or a USB to conveniently transfer files between your titrator and computer.

Connectivity & Functionality

HI902C Angled

View and print reports easily.

You can print reports directly from the titrator with a connected printer and conveniently view results with a connected monitor.

Take advantage of the versatility.

Connect the devices that help you most, whether it be an analytical balance for automatic sample entry or a printer for your reports.

Titrator Support & Methods

We’ve got people here to help.

When you purchase one of our titrators, you’re not just getting an instrument – you’re getting our whole team of experts dedicated to your success. Get the level of onsite support you need with our Standard, Silver, Gold, and Platinum onsite installation and maintenance plans.



Customizable Methods

The HI904 Coulometric Karl Fischer Titrator can store up to 100 user-defined or standard Karl Fisher titration methods. We offer optimized titration methods for a wide range of industries. If we don’t have your method in our library, we’re ready to help meet your needs.



Align with your standard methods.

Our technical experts can program and customize standard methods developed by such affiliations as ISO, ASTM, AOAC, AOCS, EPA, and more directly onto your Karl Fischer Titrator.

Titration Specifications

Range 1 ppm to 5%
Resolution 0.1ppm to 0.0001%
Result Units %, ppm, ppt, mg/g, μg/g, mg, μg, mg/mL, μg/mL, mg Br/100g, g Br/100g, mg Br, g Br
Sample Types liquid or solid with external dissolution / extraction
Pre-Titration Conditioning automatic
Background Drift Correction automatic or user-selectable value
Endpoint Criteria fixed mV persistence, relative drift stop or absolute drift stop
Dosing dynamic
Result Statistic mean, standard deviation

Dosing System Specifications

Generator Configuration diaphragm or diaphragm-less
Generator Current Control automatic or fixed (400 mA)
Generator Type Detection automatic
Titration Vessel operating volume between 100 – 200 mL
Solvent Handling System sealed system with integrated diaphragm air pump and beaker adapter

Sensor System Specifications

Sensor Type HI76330 dual platinum pin polarization electrode
Sensor Connection BNC
Polarization Current 1, 2, 5, or 10 μA
Voltage Range 2 mV to 1100 mV
Voltage Resolution 0.1 mV
Accuracy (@25ºC/77ºF) ±0.1%

Additional Specifications

Programmable Stirrer magnetic, optically regulated, digital stirrer; 200 to 2000 rpm; resolution 100 rpm
Display 5.7” (320 x 240 pixel) backlit color LCD
Methods up to 100 (standard and user) methods
Logging Data up to 100 complete titration reports and drift rate reports can be stored
Peripherals (Rear) connections for VGA display, PC-keyboard, parallel printer, USB device input, RS232
GLP Conformity Good Laboratory Practice and instrument data storage and printing
Languages English, Portuguese. Spanish, and French
Enclosure Material ABS plastic and steel
Keypad polycarbonate
Operating Environment 10 to 40°C (50 to 104°F), up to 95% RH
Storage Environment -20 to 70°C (-4 to 158°F), up to 95% RH
Dimensions 390 x 350 x 380 mm (15.3 x 13.8 x 14.9”)
Weight approximately 10 kg (22 lbs.)