Karl Fischer methodSince its proposal by Karl Fischer in 1935, a reagent was prepared using I2, SO2, pyridine, and anhydrous CH3OH (with a water content of less than 0.05%) to determine the water equivalent of the reagent. After the reagent reacts with the water in the sample, the water content in the sample is calculated by calculating the reagent consumption. The standardization organization has established this method as the standard for measuring trace amounts of water. We Also define this method as Standard method for determining trace moisture content.

The difference between Karl Fischer Coulomb method (electric quantity method) and capacity method

1Karl Fischer volumetric method moisture analyzer
The Karl Fischer titration method involves the following five basic steps for each sample measurement: 1. Inject a portion of solvent into the titration cell first; 2. Titrate a portion of Karl Fischer reagent to achieve equilibrium; 3. Inject the tested sample; 4. Titrate Karl Fischer reagent into the titration cell again; 5. Discharge waste liquid. Simply put, it means changing the reagent every time a measurement is taken. This method calculates the moisture content based on the amount of Karl Fischer reagent injected and the titration degree of the reagent, as Karl Fischer reagent is affected by factors such as environmental humidity, light, and sealing, and the titration degree is constantly changing, resulting in measurement errors. During the testing process, every time a measurement is made, the waste liquid used last time needs to be discharged and a new Karl Fischer reagent needs to be titrated, causing pollution to the environment. The consumption of reagents is high, the operation is complicated, and the measurement accuracy is low.
The automatic volumetric moisture analyzer also requires the above five basic steps, except for the addition of functions such as automatic titration and automatic waste liquid discharge.

2、 Karl Fischer Coulombic method (coulometric method) micro moisture analyzer, representative models: SF series such as Jingtai brand SF101, SF-3, SF-5, etc
The Karl Fischer Coulombic method (coulometric method) for measuring trace moisture is a method that involves injecting a sample into an electrolytic cell at equilibrium. The instrument automatically performs electrolysis based on the amount of water in the sample to reach equilibrium again. The moisture content is calculated based on the amount of electricity consumed during electrolysis, and the results are displayed digitally on the instrument, resulting in higher accuracy and faster measurement speed. The reagents used in the Coulombic method can be continuously used for a long time without frequent replacement. The amount of reagents used is low, the measurement cost is low, and the operation is simple.

The SF-5 trace moisture analyzer uses the Karl Fischer coulomb method (Karl Fischer titration) to determine the moisture content in the sample, overcoming the disadvantages of low accuracy, large electrolyte consumption, and cumbersome operation of the Karl Fischer titration instrument. To meet the requirements of high sensitivity and accuracy of the instrument, advanced automatic control circuits and large electrolysis current and current automatic control technology are utilized. The measurement results are directly displayed in digital form, and the instrument has a novel and lightweight structure. It is more reliable and convenient to use, and the electrolyte can be repeatedly used for a long time. The instrument has a self checking function. It has the characteristics of fast analysis speed (one result per minute), simple operation, high accuracy, and strong automation, and is widely used in the moisture determination process of industries such as petroleum, chemical, power, railway, pesticide, medicine, environmental protection, and plastic pellets.

The SF-5 Coulombic Trace Moisture Analyzer, Karl Fischer Coulombic Trace Moisture Analyzer, and Card Type Trace Moisture Analyzer meet the following standards:

1. GB/T7600 "Determination of Moisture Content in Operating Transformer Oil (Coulombic Method)
2. GB6283 "Determination of Moisture Content in Chemical Products - Karl Fischer Method (General Method)"
3. SH/T0246 "Determination of Water Content in Light Petroleum Products (Electricity Method)
4. SH/T0255 "Method for determination of moisture content in additives and lubricating oils containing additives (electric method)"
5. GB/T11133 "Determination of Water Content in Liquid Petroleum Products (Karl Fischer Method)"
6. GB/T7380 "Determination of Moisture Content of Surfactants (Karl Fischer Method)"
7. GB10670 "Determination of Trace Moisture in Fluoromethane for Industrial Use by Karl Fischer Method"
8. GB/T606 Chemical reagents General method for determination of moisture Karl Fischer method
9. GB/T8350 "Denaturated Fuel Ethanol"
10. GB/T8351 "Ethanol gasoline for vehicles"
11. GB/T3776.1 "Method for determination of moisture content of pesticide emulsifiers"
12. GB/T6023 Determination of Trace Moisture in Industrial Butadiene by Karl Fischer Coulombic Method
13. GB/T3727 Determination of Trace Water in Ethylene and Propylene for Industrial Use
14. GB/T7376 Determination of Trace Moisture in Fluorinated Alkanes for Industrial Use
15. GB/T18619.1 Determination of water content in natural gas Karl Fischer Coulomb method
16. GB/T512 "Method for determination of moisture content in lubricating grease"
17. GB/T1600- Method for determination of moisture content in pesticides
18. GB/T11146 Determination of Water Content in Crude Oil (Karl Fischer Coulombic Method)
19. GB/T12717 "Test Methods for Acetic Esters for Industrial Use"
20. GB/T5074 Determination of moisture content in coking products
21. GB/T18826 Industrial 1,1,2-tetrafluoroethane (HFC-134a)
22. Compliant The technical requirements for determining the moisture content in drugs using the Karl Fischer method in pharmacopoeia.

SF-5 Coulombic Trace Moisture Analyzer, Karl Fischer Coulombic Trace Moisture Analyzer, Card Type Trace Moisture AnalyzerMain technical indicators:

SF-5 Coulombic Trace Moisture Analyzer, Karl Fischer Coulombic Trace Moisture Analyzer, Card Type Trace Moisture AnalyzerPacking list: