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The HI-933 is an automatic volumetric Karl Fischer titrator with high accuracy, great flexibility and repeatability.

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Full Description Specification

HI-933 Karl Fischer Volumetric Titrator for moisture determination

The titrator is designed to perform titrations for a variety of sample types/matrices, allowing the user to obtain both good results and high speed analysis.

The HI-933 analyses for water content ranging from 100ppm to 100%. This powerful titrator automatically dispenses the titrant, detects the endpoint, and performs all necessary calculations and graphing.


  • Small footprint, requires minimal bench space
  • Casing made with strong, chemically resistant plastic
  • Powerful built-in algorithms for termination criteria based on fixed mV endpoint or absolute/relative drift
  • Minimised water vapour entry with the sealed solvent system
  • Balance interface for automatic weighing
  • Support for 100 titration methods
  • User-customisable reports
  • Clearly displayed warning and error messages

Burette and Dosing System

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.

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.

Chemically Resistant Tubing and 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.

Titration and Solvent System

Efficient Sample Handling

The HI933 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, colour-indicating, silica gel desiccant prevents the ingress of ambient humidity into the sealed system while maintaining full titrator functionality. The desiccant colour change allows a user to recognize when its adsorption capacity has depleted and is ready for replacement or recharging.

Titrator Capabilities

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 HI933 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 HI-933’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 HI-933 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 optimisation.

Interactive Colour Display

A large, colour LCD screen clearly shows the chosen titration method along with results, units, dosing size, titration volume, 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, 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 HI933 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 HI933 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 labour.

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

Easily incorporate 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
  • 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
  • A keyboard can be attached for added versatility

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Read More

Range100 ppm to 100%
Resolution1ppm (0.0001%)
Result Units%, ppm, mg/g, μg/g, mg, μg, mg/mL, μg/mL, mg/pc, μg/pc
Sample typeliquid or solid
Pre-titration conditionAutomatic
Background drift correctionautomatic or user-selectable value
DosingDynamic with optional pre-dispensing
Result Statisticmean, standard deviation
Titration System
Dosing pump resolution1/40000 of the burette volume (0.125µL per dose) with 5mL burette
Dosing pump accuracy±0.1% of full burette volume
Syringe5mL precision ground glass with PTFE plunger
Valvemotor-driven 3-way PTFE liquid contact material
TubingPTFE with light block and thermal jacketing
Dispensing tipglass, fixed position, anti-diffusing
Titration vesselconical with operation volume between 50-150mL
Solvent handing systemsealed system, integrated diaphragm air pump
TypeHI-76320 dual platinum pin, polarisation electrode
Polarisation current1, 2, 5, 10,15, 20, 30 or 40µA
Voltage Range2mV to 1000mV
Voltage resolution0.1mV
Accuracy @25°C±0.1%
Typemagnetic, optically regulated, digital stirrer
Speed200-2000 rpm
Resolution100 rpm
MethodsUp to 100 (standard and user) methods
ReportsUp to 100 complete titration reports and drift rate reports
Additional specifications
Display5.7” graphical colour display with backlight
Peripheral devicesPC (USB standard B); flash drive (USB standard A); analytical balance
LanguagesEnglish, Spanish, French, Portuguese
Power supply/Power draw100-240 Vac, 50/60 Hz / 0.5 Amps
Enclosure materialABS/PC and Steel
Operating Environment10 to 40 °C (50 to 104 °F); up to 80 % RH
Storage Environment-20 to 70 °C (-4 to 158 °F); up to 95 % RH
Dimensions315 x 205 x 375 mm
Weightapproximately 4.3 kg with 1 pump, stirrer and sensors
Ordering informationHI-933-02 is supplied with HI-76320 dual platinum pin electrode, dosing pump, 5 mL burette assembly with tubing, air pump/stirrer assembly with tubing, beaker and bottle top assemblies and all fittings, desiccant cartridges (4) with indicating desiccant, stir bar, waste bottle, calibration key, USB cable, power cable, USB flash drive, quality certificate, ISO 8655 burette compliance report and instruction manual binder.