Karl Fischer Coulometric Titrator

Karl Fischer Coulometric Titrator

  • Dynamic Titrant Dosing
  • Drift Rate Compensation
  • Selectable Endpoint Criteria

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For the measurement of such minute quantities, the coulometric method is the most efficient method

A Better Titration Experience

Our friendly technical consultants take pride in helping make your titrator selection easy – every step of the way. From determining materials and methods to installation and beyond.

The HI904 Karl Fischer Coulometric Titrator is an automatic titration system for the measurement of trace amounts of water in various samples. The Coulometric Titrator complements our wide range of titration 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 Karl Fischer reaction, detects the endpoint, and performs all necessary calculations and graphing.

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 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.

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; 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 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.

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

Interactive Color Display

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

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.

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 & 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.

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.

Connectivity & 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.

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.

Range1 ppm to 5%
Resolution0.1ppm 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 Typesliquid or solid with external dissolution / extraction
Pre-Titration Conditioningautomatic
Background Drift Correctionautomatic or user-selectable value
Endpoint Criteriafixed mV persistence, relative drift stop or absolute drift stop
Result Statisticmean, standard deviation
Generator Configurationdiaphragm or diaphragm-less
Generator Current Controlautomatic or fixed (400 mA)
Generator Type Detectionautomatic
Titration Vesseloperating volume between 100 – 200 mL
Solvent Handling Systemsealed system with integrated diaphragm air pump and beaker adapter
Sensor TypeHI76330 dual platinum pin polarization electrode
Sensor ConnectionBNC
Polarization Current1, 2, 5, or 10 μA
Voltage Range2 mV to 1100 mV
Voltage Resolution0.1 mV
Accuracy (@25ºC/77ºF)±0.1%
Programmable Stirrermagnetic, optically regulated, digital stirrer; 200 to 2000 rpm; resolution 100 rpm
Display5.7” (320 x 240 pixel) color LCD
Methodsup to 100 (standard and user) methods
Logging Dataup 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 ConformityGood Laboratory Practice and instrument data storage and printing
LanguagesEnglish, Portuguese. Spanish, and French
Enclosure MaterialABS plastic and steel
Operating Environment10 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
Dimensions390 x 350 x 380 mm (15.3 x 13.8 x 14.9”)
Weightapproximately 10 kg (22 lbs.)