HI903 Karl Fischer Volumetric Titrator

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 HI903 Karl Fischer Volumetric Titrator is an automatic titrator that complements our wide range of products dedicated to efficient and accurate laboratory analysis. The HI903 analyzes for water content ranging from 100 ppm to 100%. This powerful titrator automatically dispenses the titrant, detects the endpoint, and performs all necessary calculations and graphing.


Titrator Capabilities

HI903 Angled

Dynamic Titrant Dosing

The dynamic dosing feature allows for timely and accurate titration results by relating the titrant volume dosed to the mV response from the titration reaction. This provides for larger doses near the beginning of a titration and smaller, more precise doses near the titration endpoint.

Drift Rate Compensation

The HI903 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.

Titrant Recordkeeping

The HI903’s titrant database can store information for up to 20 titrants. The database may be programmed to remind a user when to standardize their titrant, reducing error in analysis.

Selectable Endpoint Criteria

The HI903 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.

Burettes & Dosing System

Burette and Dosing

Precision Dosing Pump

Our unmatched 40,000 step piston driven pump is capable of delivering as little as 0.125 µL of titrant accurately and precisely.

Chemically Resistant Tubing & Syringe

Aspiration and dispensing tubes are constructed of durable, chemically resistant PTFE and feature a light-blocking polyurethane outer sleeve to protect light sensitive reagents.

Anti-Diffusion Dispensing Tip

A specially designed glass dispensing tip delivers titrant precisely into high turbulence mixing zones, ensuring a rapid reaction. Its angular construction helps prevent titrant from diffusing into the sample solvent.

Titration & Solvent System

Efficient Sample Handling

The HI903 features a quick-remove sample port with a replaceable rubber septum allowing for fast and easy sample introduction to the titration vessel. An integrated magnetic stirrer ensures homogeneity for an accurate and speedy reaction.

Chemically Resistant Titration Vessel

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

Sealed Solvent System

The titration vessel is completely sealed to minimize exposure to ambient humidity, keep the system dry, and reduce titrant consumption while saving time between titrations. Solvent may be exchanged in a matter of seconds without opening the titration vessel.

Visually Recognizable Desiccant

A rechargeable, color-indicating, silica gel desiccant prevents the ingress of ambient humidity into the sealed system while maintaining full titrator functionality. The desiccant color change allows a user to recognize when it’s adsorption capacity has depleted and is ready for replacement or recharging.

Titrant and Solvent System

Interface & Display

Interactive Color Display

A large, color LCD screen clearly shows the chosen titration method along with results, units, dosing size, titration volume, 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.

USB Transfer

Connectivity & Functionality

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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 HI903 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 HI903 Karl Fischer system.

Methods of Analysis


Autosampler Specifications

Titration Specifications

Range 100 ppm to 100%
Resolution 1 ppm to 0.0001%
Result Units %, ppm, mg/g, μg/g, mg, μg, mg/mL, μg/mL, mg/pc, μg/pc
Sample Types liquid or solid
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 with optional pre-dispensing rate
Result Statistic mean, standard deviation

Dosing System Specifications

Dosing Pump Resolution 1/40000 of the burette volume (0.125 μL per dose) with 5 mL burette
Dosing Pump Accuracy ±0.1% of full burette volume
Syringe 5 mL precision ground glass with PTFE plunger
Valve motor-driven 3-way, PTFE liquid contact material
Tubing PTFE with light block and thermal jacketing
Dispensing Tip glass, fixed position, anti-diffusing
Titration Vessel conical with operation volume between 50-150 mL
Solvent Handling System sealed system, integrated diaphragm air pump

Sensor System Specifications

Sensor Type HI76320 dual platinum pin polarization electrode
Sensor Connection BNC
Polarization Current 1, 2, 5, 10, 15, 20, 30 or 40 μA
Voltage Range 2 mV to 1000 mV
Voltage Resolution 0.1 mV
Accuracy (@25ºC/77ºF) ±0.1%

pH Specifications

mV Specifications

ISE Specifications

Temperature Specifications

Additional Specifications

Programmable Stirrer magnetic, optically regulated, digital stirrer; 200 to 2000 rpm; resolution 100 rpm
Display 5.7” (320 x 240 pixel) color LCD
Methods up to 100 methods (standard and user-defined)
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
Power Supply 100-240 VAC; "-01" models, US plug (type A); "-02" models, European plug (type C)
Dimensions 390 x 350 x 380 mm (15.3 x 13.8 x 14.9 in)
Weight approximately 10 kg (22 lbs.)