Karl Fischer Coulometers C20/C30 - bikeitech.com

1 C20/C30 karl Fischer CoulometersOperating InstructionsTable of contentsC20/C303 Introduction1 karl Fischer Water Determination Measuring Principle2 Fundamentals of coulometric water content Description of Functions3 Layout of the Operating the The "Home" dialog The User Entering Data in the User Shortcuts and Direct The Start analysis dialog Online Setup (Setup)4 Titration User Global User Analysis and resources Monitoring the Expiration Date and Life Span of Monitoring the expiration date of a Monitoring the Life Span of a Reagent Auxiliary Service & MT Reset to factory Titrator firmware Board Board Manual operations5 Table of contents78899999101011111112141414151518 1818191919202020212324242525262627272728 29292929292929303030C20 Polarized Methods6 Establishing Modifying or deleting Starting Starting

2 Methods from the Method Terminate Method Syntax Rules for Establishing a Possible Number of Method Types and Possible Number of Sample Method Functions Within a Method Functions Outside of a Overview of Method Method Title Drift Sample (KF) Titration Mix Titration (KF coul) Auxiliary End of Hidden method Series templates7 Sample Sample Analysis Sequences8 Starting an KF Analysis Series analyses with the "Stromboli" oven sample External Switching between determination Replacing the reagent Raw results9 All Add Outlier Undo Delete all Evaluate and calculate10 Table of contents31313333343535353636363737373839 3939404343434445454547484848494949515152 53545454555555565658585859C20/C305 Analysis Indexing of method Naming conventions for using

3 Analysis data in Results proposal Internal Using analysis data in Mathematical functions and Subject index11 5959606262646464661 IntroductionSimple and compactThe devices in mettler toledo 's Titration Compact Line are modern, compact titrators for use in awide variety of application areas. They can be used, for example, in quality control as well as inresearch and development and satisfy the most demanding of requirements. The titrators in the Titration Compact Line perfectly combine simple, easy-to-understand operation withan extremely high level of precision and outstanding reliability.

4 Thanks to automatic titrant recognition(Plug & Play burettes), the titrator independently identifies which titrant is required without interventionfrom the operator. Settings no longer need to be adjusted manually, even when connecting a printer or aStromboli oven sample changer. Titration Compact devices can either be controlled by touchscreen or by using LabX PC software. Thelarge color touchscreen allows intuitive control by the user and flexibility in its adjustment options. Allfunctions can be activated directly from the home screen via shortcuts which can be freely created, mak ing everyday use extremely easier.

5 The touchscreen control of the titrator and all adjustable parametersare described in detail in the operating instructions. The separate installation information explains all the necessary steps for installing and commissioningyour device. The enclosed "Quick Guide" then guides you through the first titration using a practicalexample. If you have any additional questions, mettler toledo is always available to assist karl Fischer Water Determination Measuring PrincipleThe karl Fischer procedure is a titration method used for the quantitative determination of water content inliquids and solids.

6 karl Fischer titration is used in a variety of areas, for determining the water con tent of groceries, chemicals, pharmaceuticals, cosmetics and mineral oils. To determine the water content, first sulfur dioxide and water react with iodine:2 H2O + SO2 + I2 SO42 + 2 I + 4 H+ The addition of alcohol ( methanol, ethanol), causes a preliminary reaction to take place in whichsulfur dioxide forms an acidic ester, which is then neutralized by the addition of a base ( imidazole,referred to in the following as "RN"):CH3OH + SO2 + RN (RNH) (CH3 OSO2)In the presence of water, the alkyl sulfite anion is oxidized to alkyl sulfate by the iodine.

7 This processreduces the yellow-brown iodine to colorless iodide: (RNH) (CH3 OSO2) + I2 + H2O + 2 RN (RNH) (CH3 OSO3) + 2 (RNH) I The overall reaction proceeds as follows: H2O + I2 + SO2 + CH3OH + 3 RN --> [RNH]SO4CH3 + 2 [RNH]I The reaction runs until all the water has been consumed and hence free iodine is detected in the titrationsolution. The end point is determined using bivoltametric indication, the potential at the polarizeddouble-platinum-pin electrode falls below a certain value ( 100mV). Fundamentals of coulometric water content determinationIn coulometric karl - Fischer titration, iodine is generated in an electrochemical reaction by the anodic oxi dation of iodide at the generator electrode: 2 I I2 + 2 e If water is present in the anolyte, the generated iodine reacts directly with water.

8 I2 and H2O react in theratio 1:1. According to Faraday's law, the quantity of iodine generated is proportional to the electricalload ( mC = 1 g H2O). The coulometric consumption up to the end point is therefore a measureof the quantity of water all the water has been consumed by the reaction, the measurement solution contains a smallexcess of iodine excess is detected by the polarized measurement electrode and the electricalcurrent for iodine generation is electrodes with and without a diaphragm are avail generation and detection of iodine is the same in both Fischer titration runs at a maximum rate in the pH range to 8.

9 In practice, therefore, the solutionshould not exceed pH 8 or fall below pH acidic and basic samples, the pH value must be altered toremain within the ideal range by the addition of buffer substances (imidazole for acids, salicylic acid forbases).The titration cell consists of the anode compartment and the cathode compartment, which may be sepa rated by a diaphragm. The anode compartment contains the anolyte, which contains sulfur dioxide, imi dazole and or ethanol are used as the solvent. The cathode compartment contains thecatholyte.

10 Depending on the manufacturer, this may either be a specific reagent, or the same solution asin the anode coulometric karl Fischer procedure is suitable for samples with a low water content (1 ppm to 5 %).C20/C308 karl Fischer Water Determination Measuring Principle3 Description of Layout of the TerminalThe control panel of the terminal consists of an integrated touchscreen and the following buttons, locatednext to the touch-sensitive surface of the display: The Reset button ends all tasks that are currently running. The Info button accesses the interactive online help for the content of the current dialog.