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899 Coulometer

The 899 Coulometer is the most compact and flexible Coulometer yet from Metrohm! Besides a footprint the size of just a DIN A4 sheet of paper, it comes with a Power Box for its own independent power supply!

Coulometry is the ideal method for water determination in fluids, solids and gases when it comes to water determination in the trace range (10 µg to 10 mg absolute water). Moreover, coulometry is an absolute method and thus no titer determination is necessary.

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Coulometry to go – 899 Coulometer determines water content wherever you want!

Built-in magnetic stirrer
The 899 Coulometer does not need much space because it has its own magnetic stirrer built in. There is no need for a support rod either. An integrated holder keeps the titration cell safely standing on the upper side of the instrument.

Independent power supply
No socket around to plug in the power cord? No problem with the 899 Coulometer. In this case, users can rely on the instrument’s independent power supply that comes with an optional Power Box containing a set of rechargeable batteries. This means users can perform coulometric determinations of the water content almost anywhere they want!

Automation possible
At the same time, the 899 Coulometer provides the capabilities of a full-grown Metrohm Coulometer. Thus, it can be linked to a manual oven (860 KF Thermoprep) or to an 885 Compact Oven Sample Changer for fully automated thermal sample preparation and subsequent coulometric determination of the water content.

831/756 Coulometer

Inexpensive coulometer including titration cell and generator electrode with diaphragm. It has become indispensable in many laboratories thanks to its reliability, its backlit graphical display, the multi-language dialog and the simplicity of its operation. The clear display provides information regarding the relevant titration parameters and unambiguous indication of the progress of the titration in the form of a curve showing µg water over time.Recommended measuring range: 10 µg - 200 mg absolute water. Model 756 features a built-in printer.

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831 and 756 Coulometric Karl Fischer Titrators

Precise and economical
These Karl Fischer coulometers ensure accurate and reproducible results, even for water contents in the lower microgram range. They feature a compact design, flexibility and easy operation. The large LCD screen provides a clear view of the parameters, and it also displays the live curve in microgram water versus time. Both models come equipped with two RS-232C interfaces, which allow communication with a balance, external printer and/or PC; Model 756 features a built-in printer.

Water content Precision
10 µg to 1,000 µg ±3 µg
>1,000 µg 0.3% or better

Economical determination of trace amounts of water:
  • Microcontroller ensures precision down to the lower microgram range
  • Ready-to-go methods are preloaded in the instrument
  • Expandable, modular system—add automation, software and/or KF oven
  • Generator electrode available with or without a diaphragm
  • GLP compliance—full documentation, keyboard lockout, user name registration and result limits

Example applications, moisture content of:

Solvents Finished products Industrial products
  • Acetic acid
  • Acetonitrile
  • Benzene
  • Chloroform
  • Cresols
  • Cyclohexane
  • Dioxane
  • Ethanol
  • Furan
  • Glycerol
  • Hexane
  • Isopropanol
  • Liquid paraffin
  • Nitrobenzene
  • Octanol
  • Petroleum ether
  • Pyridine
  • Resorcinol dimethyl ether
  • Tetrahydrofuran
  • Toluene
  • Vinyl ether
  • Xylene
  • Aftershave lotion
  • Almond oil
  • Aperitif
  • Butter
  • Coffee cream
  • Cognac
  • Cough syrup
  • Lotion
  • Margarine
  • Mascara
  • Mustard
  • Sun cream
  • Vinegar
  • Benzoic acid
  • Freons
  • Gasoline
  • Insulating oil
  • Metal oxides
  • Mineral oil
  • Nitrogen
  • Petroleum
  • Plastic films
  • Plastics granules
  • Salicylic acid
  • Salts
  • Silicone oil
  • Sulphuric acid
  • Transformer oil

851/852 Titrando

Coulometric Karl Fischer titration is the method of choice for low-level water determinations (10 μg – 10 mg absolute water content) in liquid, solid and gaseous samples. Models 851 and 852 execute coulometric KF quickly and easily. Should the water content be too high for coulometric titration, Model 852 can also handle volumetric titration, analyzing samples that range from just a few micrograms of water up to 100%.

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Meet the new generation of coulometric KF: 851 and 852 Titrando®

Coulometry is the ideal method for water determination in liquids, solids and gases when it comes to water determination in the trace range (10 µg to 10 mg absolute water). In addition, coulometry is an absolute method and thus no titer determination is necessary. Coulometric titrations are carried out easily and quickly with the 851 Titrando. Recommended measuring range: 10 µg - 200 mg absolute water. The 852 Titrando controls not only coulometric, but also volumetric Karl Fischer titration.

Additional key features include:

‹AUTO START› determinations. How many times have you had a sample inject into the titration cell without first pressing the start button? The water of the sample is then conditioned away and you need to repeat the process, which wastes sample, reagents and your time. Not anymore! Models 851 and 852 automatically recognize sample additions, and only then will the determination start.

Automatic reagent exchange. Connect up to 4 dosing units to either model for the aspiration and addition of Karl Fischer reagent, water standard or auxiliary reagents such as buffer or solubilizers. Because the exchange is fully automatic, you are saved from opening the titration cell and waiting on long conditioning times and reducing your exposure to potentially hazardous reagents!

Bromine index can now be determined. Bromine index according to ASTM can be run on our new coulometers without any special additional equipment.

Accuracy-ensuring Dosino® reagent dispensing. Our patented “top-down” dosing technology eliminates the build-up of air bubbles that will negatively affect results and reproducibility.

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