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SKU HI904-02 Category

Karl Fischer Coulometric Titrator HI904

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for Water Content Determination

The HI904 Karl Fischer (KF) Coulometric Titrator is an automatic titrator that complements our wide range of products dedicated to efficient and accurate laboratory analysis. The HI904 analyzes for water content ranging from 1 ppm to 5%. This powerful titrator effectively monitors the KF reaction, detects the endpoint, and performs all necessary calculations and graphing.

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Coulometric Reagent System

Precision Iodine Generation

Hanna’s 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 titrant accurately and precisely.

Titration and Solvent System

Chemically Resistant Titration Vessel and Tubing

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

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.

Molecular Sieve 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.

Built-in stirrer

Automatic, integrated magnetic stirrer adjustable from 200-2000 RPM with optical feedback for automatic speed control.

Titration Capabilities

Dynamic Titrant Dosing

The titration speed feature allows for timely and accurate titration results by relating the amount of iodine generated to the mV response from the Karl Fischer reaction.

Drift Rate Compensation

The HI904 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 sample.

Titration Results Averaging

Successive results from a titration method may be averaged with recording of the standard deviation.

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.

Interface and Display

Detailed Titration Graphs

A real-time titration curve can be displayed during each titration; this feature is useful when new methods are tested or when a procedure requires optimization.

Interactive Color Display

A large, color LCD screen clearly shows the chosen titration method along with results, units, drift rate and mV value.

Simple & Quick Navigation

Virtual key selections present on the display allow for simple and quick navigation between screens and menus without getting lost in a nest of information.

Data and Storage

Customizable Titration Reports

Each titration report is fully customizable so users can ensure they are storing and filing the appropriate data required for their application and procedures.

Flexible GLP Management

All necessary GLP (Good Laboratory Practice) information can be recorded with each sample including: sample identification, company and operator name, date, time, and electrode ID codes and calibration information.

Effortless Data Transfer

Data can easily be transferred to a USB flash drive or PC with the Hanna HI900PC application software. The USB port allows for the transfer of titration methods, titration reports and software upgrades via USB flash drive.

Methods of Analysis

Customizable Methods

The HI904 can store up to 100 user-defined or standard titration methods. Each method may be customized and optimized for performance based on application and user requirements.

Titration Method Support

Onsite installation, training, and customization is available from one of our Applications or Service experts. Hanna offers continued support via phone or webinar for any questions you might have along the way.

Adaptable 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 titrator. Ask our Sales Consultants which standard methods are possible with our HI904 Karl Fischer system.

Connectivity and Functionality

Configurable Balance Interface

Sample size may be automatically entered from any laboratory analytical balance with a RS232 serial output saving time and labor.

Multiple Peripherals

Users can print reports directly from the titrator using a standard parallel printer. An external monitor and keyboard may be attached for added versatility, as well as an analytical balance for automatic sample mass entry for titrations.

Versatile Data Management

HI900 Series titration systems can be easily incorporated into any existing GLP data management program.

  • Easily record all necessary GLP information with every sample, such as sample identification, company and operator name, date, time, electrode ID codes and calibration information
  • Data can be transferred to a PC using Hanna HI900PC software
  • The USB port allows for the easy transfer of methods, reports and software upgrades via a USB flash drive
  • Users can print reports of analyses directly from the titrator using a standard parallel printer
  • An external monitor and keyboard can be attached for added versatility
Customizable general options

Titration general options can be configured to user requirements

Titration reports

Titration results can be viewed on-screen or transferred to a USB storage device

Titration graphs

Titration graphs can be viewed on-screen or saved as images and transferred along with titration report

Sample analysis

Interface displays real-time monitoring of water content and results


The HI904 keeps the solvent dry between samples and monitors the drift rate


Titration results are displayed with options to average results or a user-customized report

Sample addition

The HI904 recommends a sample size based on expected results

Fully configurable balance interface

Enter sample weight automatically from any laboratory analytical balance with RS232 serial output

Fully customizable titration methods

Customize methods for any application




1 ppm to 5%


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 Type

liquid or solid (external dissolution / extraction)

Titration Vessel

operating volume between 100 – 200 mL

Reagent Handling System

sealed system with integrated diaphragm air pump and beaker adapter

Generator Electrode


diaphragm or diaphragm-less

Current Control

automatic or fixed (400 mA)

Electrode Type Detection



Pre-Titration Conditioning


Background Drift Correction

automatic or user-selectable value

Endpoint Criteria

fixed mV persistence, relative drift stop or absolute drift stop



Result Statistic

mean, standard deviation

Detector Electrode

Type / Connection

dual platinum pin, polarization electrode / BNC connector

Polarization Current

1, 2, 5, or 10 μA

Voltage Range

2 mV to 1100 mV

Voltage Resolution

0.1 mV

Accuracy (@25°C/77°F)


Peripheral Devices


easily view, transfer, print or delete methods and reports via HI900PC application

USB Flash Drive

easily upgrade software or transfer methods and reports between devices using a USB drive

Laboratory Analytical Balance

RS232 to connect any laboratory balance


print directly from the HI904 to a printer via parallel port


instrument status and titrations can be viewed on a larger screen using any VGA-compatible external monitor


alphanumeric text can be entered using an optional PS/2 keyboard

Additional Specifications

Graphic Display

5.7” (320 x 240 pixel) color LCD

Titration Methods

up to 100 (standard and user) methods

Data Storage

up to 100 complete titration reports and drift rate reports can be stored

GLP Conformity

Good Laboratory Practice and instrument data storage and printing


English, Portuguese, Spanish, and French

Enclosure Material

ABS plastic and steel




100-240 VAC
“-01” models, US plug (type A)
“-02” models, European plug (type C)

Operating Environment

10 to 40°C,  up to 95% RH

Storage Environment

-20 to 70°C, up to 95% RH


390 x 350 x 380 mm (15.3 x 13.8 x 14.9”)


approximately 10 kg (22 lbs.)

Ordering information

HI904D-01 and HI904D-02 are supplied with diaphragm, HI904-01 and HI904-02 are supplied without diaphragm.

All Models Include: dual platinum pin electrode, air pump assembly, titration vessel assembly (glass vessel, accessory port stopper, sample port cap and septum, stir bar, desiccant, desiccant cartridge, fittings), vessel support with adapter, pump locking screw with plastic head, reagent bottle assembly ( bottle cap, desiccant, desiccant cartridge, fittings, tubing (silicone and PTFE)), water bottle assembly (waste bottle, bottle cap, desiccant, desiccant cartridge, fittings, tubing (silicone and PTFE)), calibration key, reagent exchange adapter, accessory holder assembly, joint grease, Karl Fischer generator electrode (removable generator electrode cable), USB cable, USB storage device, HI900 PC application software, power adapter, quality certificate and instruction manual binder.

Additional Informations

Additional information


Meter type

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