Coulometric method for moisture determination

The coulometric method for measuring moisture is based on the Karl Fischer reaction, in which iodine and sulfur dioxide undergo a quantitative reaction with water in an alcoholic alkaline solution. The consumed iodine is replenished by electrolyzing potassium iodide to generate iodine, and the moisture content is calculated by measuring the electrolytic charge. This method is used to determine trace moisture in liquids, solids, and gases.
Selection
When selecting a coulometric moisture analyzer, consider the sample properties: use a Karl Fischer oven for volatile samples. Pay attention to the detection limit, typically 0.1 μg for standard instruments. Be mindful of interfering substances, as strong acids and bases can damage the reagent. Choose the electrolytic cell capacity based on the sample volume. Check the instrument's repeatability and drift values.

Terms

Standards

Instruments

Using halogen radiation heating technology, the moisture readability reaches 0.01%, the determination of Precision +/- 0.2%, and the test is completed quickly in a few minutes, with 8 kinds of paraMeter display functions.

$ 446.00

Suitable for Coulometry moisture determination, containing 500mL KF-1A Reagent and 5 bottles of 5mL KF-1B Reagent, supporting a variety of Moisture Meters to meet the needs of laboratory moisture analysis.

$ 236.00

Imported chips ensure stable performance, 1 second Fast Response to complete the detection, measurement range 10-85%, resolution of 0.1%, suitable for all kinds of fresh meat moisture determination.

$ 225.00

It is suitable for volumetric moisture determination, including 500mL of A and B Reagents, with a titration range of 3-5, and is used with ZDY-502/ZDY-504 instruments.

$ 204.00

Measurement range 5μg~ 100mg, Precision of moisture determination up to +/- 0.3%, results can be obtained in one minute, automatic tracking control of electrolysis current, reliable and easy to use.

$ 1518.00

Using Coulomb ElectRode technology, it can measure 10μg~ 20mg moisture, support 10mA to 100mA electrolysis current, no need to calibrate Reagent, with RS232 interface to connect to the printer.

$ 1939.00

Using electromagnetic force equilibrated Electronic Balance and halogen radiation technology, moisture readability of 0.02%, Heating Temperature range RT + to 200 ℃, quickly complete the test in a few minutes, durable and functional.

$ 746.00

Using halogen lamp heating source, temperature adjustment accuracy +/- 0.1 ℃, moisture readability 0.02%~ 0.1%, support timing automatic end measurement, ensure stable and efficient measurement.

$ 477.00

Moisture is measured by thermogravimetry, equipped with 500W high-efficiency halogen ring lamp for uniform heating, Temperature range 40-180 ℃ controllable. 5-inch Touchscreen real-time display of moisture change Linear dispersion, support automatic shutdown and Data storage 100 groups, intuitive operation without supervision.

$ 420.00

Measurement principle of resistance method, accuracy of +/- 1%, equipped with 610mm detachable long probe, can measure different depths of grain moisture, support voice broadcast and a variety of function settings, suitable for a variety of grain moisture detection.

$ 97.00

Using halogen lamp heating source and German HBM Sensor, moisture readability of 0.01%, Repeatability ≤ +/- 0.2%, support 0~ 100% moisture measurement range, suitable for a variety of sample states such as powder and liquid.

$ 564.00

Measurement principle using resistance method, accuracy of 0.1%, support a variety of grain Measurement range, with voice reminder and automatic shutdown function, portable design weighs only 254g.

$ 90.00

Measurement range 3μg~ 150mg, sensitive valve 0.1μg, Precision up to +/- 0.3%, automatic detection of electrolysis and measurement circuit, suitable for a variety of sample analysis.

$ 1910.00

Measurement range 0-99.9%, Response Time 1 second, Multi-gear selection and 50mm scanning depth, suitable for on-site rapid moisture determination.

$ 223.00

Measurement principle using resistance method, Measurement range 2~ 70%, accuracy +/- 2%, Response Time only 1 second. With 4 wood Measurement modes, support Data storage and voice reminder function.

$ 94.00

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