851 Titrando / 852 Titrando

851 Titrando / 852 TitrandoTop-class coulometers

851 Titrando and 852 Titrando extend and completethe Titrando family02The advantages of the new coulometers• Simultaneous coulometric and volumetric titrations with the 852 Titrando• Bromine index• Automatic start of titration• Automatic reagent exchange

03Coulometric titrations with the 851 TitrandoFor trace concentrations (10 μg…10 mg absolute watercontent), coulometry is the ideal method for determiningwater in liquids, solids and gases. Furthermore, coulometryis an absolute method, so no titer determination isnecessary.With the 851 Titrando coulometric titrations can be performedeasily and quickly.

04Coulometric and volumetric titrations withthe 852 TitrandoThe 852 Titrando performs both coulometric and volumetricKarl Fischer titrations. If the water content of thesamples is too high for coulometric determination, this isno obstacle for the 852 Titrando as this instrument isable to analyze samples with a water content rangingfrom a few micrograms to 100%. Using the tiamo TMsoft ware both techniques can be applied simultaneously.

Bromine indexThe bromine index of a sample is a measure of thenumber of double bonds that are present. Just as iodineis produced in coulometric Karl Fischer titration, duringthe determination of the bromine index bromine is produceddirectly in the titration cell and reacts with thedouble bonds.With the 851 and 852 Titrandos the bromine index canbe determined coulometrically. The determinationsrequire no further accessories − the indicator and generatorelectrodes and the titration cell can also be usedfor this application. Only the working medium needs tobe changed.05Schematic of a bromine addition reactionAutomatic start of titrationIt can happen very quickly that the sample is put into thetitration vessel before the titration has been started. Inthis case, conditioning continues until the water in thesample has reacted with the added iodine. Subsequentcalculations are impossible and the measurement has tobe repeated.With the 851 or 852 Titrando that can no longer happen.The instruments start the titration automatically as soonas sample is added. This means that you save reagents,sample and, above all, valuable time.

Automatic reagent exchange − safe handling of toxicreagents06Using one of the four MSB ports, it is possible to connectDosinos and Dosing Units to the new coulometers. In thisway, the exchange of reagent can be automated, whichmeans that the cell does not need to be opened, so nomoisture can get in. This shortens the conditioning timesafter reagent exchange. Moreover, direct contact withtoxic reagents is avoided.Automation pays dividends!Increasing sample numbers, time-consuming samplepreparation steps and unattended overnight operationare good reasons for using sample changers. Combinedwith the 814 USB Sample Processor, 815 Robotic USBSample Processor XL and 874 USB Oven Sample Processor,the Titrandos offer a high degree of automation.The reagent exchange can be triggered by way of thenumber of determinations performed, the age of thereagent, its water capacity or the drift value. Of course,Dosinos and Dosing Units are also used to add samplesolutions, standard solutions or auxiliary solutions such assolubilizers.

07Ordering information2.851.0010 851 Titrando, generator electrode with diaphragm2.851.0110 851 Titrando, generator electrode without diaphragm2.851.0020 851 Titrando with Touch Control, generator electrode with diaphragm2.852.0050 852 Titrando, generator electrode with diaphragm2.852.0150 852 Titrando, generator electrode without diaphragm2.852.0160 852 Titrando with Touch Control, generator electrode without diaphragm

Subject to changeLayout by Ecknauer+Schoch ASW, printed in Switzerland by Metrohm AG, CH-9101Herisau8.851.5001EN − 2010-04www.metrohm.com