The HI931 Automatic Titrator is the answer to your dedicated titration needs. Fully customizable, the HI931 delivers accurate results and intuitive user experience, all in a compact package. Titrate for a variety of measurements at the push of a button including acids, bases, redox, and selective ions. With no additional programming upgrades to purchase, you can start measuring right away.
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The Cycoloy® body is durable, heat-resistant, and resists staining. Menu buttons are part of the display making it fully sealed and easy to clean. A high contrast LCD display makes every character on the display stand out and the wide viewing angle allows measurements to be seen from any angle. The backlight is adjustable for perfect viewing and a backlight saver option protects the display during periods of inactivity.
This new generation of titrator features a 50% smaller footprint than the HI901 Automatic Titrator for maximum use of your lab space. Use it in any sized space while providing accurate and consistent results.
Virtual keys present on the display allow for simple and quick navigation between screens and menus without getting lost in a nest of information. If you need additional information about a screen, simply press the dedicated button for help.
Paired with the right electrode, this potentiometric titrator can perform any number of standard titrations including pH and mV tests with fixed endpoints or single equivalence points.
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.
Administrative users can set a PIN code on the device protecting against unauthorized access. Titration method options and results are tamper-proof while a non-administrator operates the titrator, ensuring records remain safe, secure, and traceable.
With Hanna’s Clip-Lock™ burette feature, it only takes a few seconds to exchange titrants and reagents preventing cross-contamination and saving time.
Our unmatched 40,000-step piston driven pump is capable of dosing extremely small and highly accurate volumes of titrant or reagent.
Aspiration and dispensing tubes are constructed of durable, chemically resistant PTFE and feature a light-blocking polyurethane outer sleeve to protect light sensitive reagents.
This electrode holder can hold up to 3 electrodes, 4 tubes, and 1 temperature probe at any given time. The holder is angled and the stirrer is removable for access to smaller volume titrations without hassle. Use electrodes with different diameters when needed simply by changing the electrode guide. No need to move electrodes around, get the best tube alignment for your titration with a rotating holder.
For a more compact design, the electrode holder is built directly into the titrator body. The press-to-release button makes for simple height control. Need to save more space? Just reverse the holder to accommodate larger beakers.
The removable overhead stirrer has built-in speed control for more consistent stirring.
HI931 functions as a titrator, pH meter, mV/ORP meter, and ISE meter. Valuable laboratory bench space is saved, and multiple tests can be performed on one sample.
Connect the devices that help you most, whether it be an analytical balance for automatic weight sample entry or a printer for your reports.
You can print reports directly from the titrator with a connected printer.
Don’t worry about small spills in the laboratory with built-in spill handling. An external gutter system protects important connections and interior trays safeguard internal electronics.
A peristaltic pump may be programmed to volumetrically dispense reagent prior to titration or direct measurement or aspirate post-analysis. This helps achieve consistent and accurate results and prevents operator errors such as incorrect volumes or forgetting reagent addition.
Each analysis report is fully customizable so users can ensure they are storing and filing the best data required for their application. New multiselect feature makes batch processing simple.
All necessary GLP (Good Laboratory Practice) information is recorded with each sample including sample identification, company and operator name, date, time, electrode ID codes, and calibration information.
A conveniently located USB port or direct connection to a PC allows for the transfer of titration methods, titration reports, and software upgrades. Easily convert titration methods from our software to an LIMS friendly format.
-2.000 to 20.000 pH
0.1; 0.01; 0.001 pH
up to five-point calibration, eight standard buffers and five custom buffers
-2000.0 to 2000.0 mV
1•10⁻⁶ to 9.99•10¹⁰
1; 0.1; 0.01
±0.5% monovalent; ±1% divalent
up to five-point calibration, seven standard solutions and five user-defined standards
-5.0 to 105.0°C; 23.0 to 221.0°F; 268.2 to 378.2K
0.1°C; 0.1°F; 0.1K
±0.1°C; ±0.2°F; ±0.1K, excluding probe error
propeller type, 100 to 2500 rpm, resolution 100 rpm
5.7” (320 x 240 pixel) backlit color LCD
154 x 63 x 30 mm (6.1 x 2.5 x 1.2”)
5, 10, 25, and 50 mL
±0.1% of full burette volume
up to 100 methods (standard and user-defined)
up to 100 titration and pH/mV/ISE reports
burette size is automatically recognized when inserted into the unit
user-selectable from 0.1 mL/min to 2 x burette volume/min
End Point Determination
single equivalence point (1st or 2nd derivative) or fixed pH/mV value
acid/base (pH or mV-mode), redox, precipitation, complexometric, non-aqueous, ion-selective, argentometric
user-specified expression of concentration units to suit specific calculation requirements
Real-Time & Stored Graphs
mV-volume or pH-volume titration curve, 1st derivative curve or 2nd derivative curve; pH mode, mV mode or ISE mode: pH/mV/concentration versus time
USB Host (Side)
flash drive compatibility for transfer of methods and reports
instrumentation data storage and printing capabilities
English, Portuguese, Spanish
10 to 40°C (50 to 104°F), up to 95% RH
100-240 VAC; “-01” models, US plug (type A); “-02” models, European plug (type C)
315 x 205 x 375 mm (12.4 x 8.1 x 14.8 “)
approx. 4.3 kg (9.5 lbs.) with 1 pump, stirrer and sensors
Each HI931 potentiometric titrator is supplied with: Titrator, Pump Assembly, Burette Assembly, Electrodes Holder and Stirrer, Burette Blank Support, Pump and Burette Locking Screws with Plastic Head, Temperature Sensor, Shorting Cap, Power Adapter, USB Cable, Instruction Manual, USB Memory Stick, HI900 PC Application (Installation Kit on USB Stick), and Quality Certificate.