Determination of Moisture Content in Samples

 Determination of Moisture Content in Samples

1. Product Overview

  Trace moisture is a key indicator for evaluating the quality of various chemical raw materials, oil products, pharmaceuticals and mineral materials. Excessive moisture will directly impair product performance, shorten shelf life and bring potential operational risks.

  The Karl Fischer Coulometric Titration method is currently the mainstream technique for trace moisture determination across industries, featuring high testing accuracy and broad applicability.

  The SH103 Fully Automatic Trace Moisture Analyzer is developed and manufactured by Shandong Shengtai Instrument Co., Ltd. Based on the classic Karl Fischer Coulometric Titration principle, it can accurately measure trace moisture in liquid, gas and solid samples. This instrument is widely used in petrochemical industry, oil-filled electrical equipment, pharmaceuticals, pesticides, mineral raw materials and other fields.

  Equipped with a 7-inch color LCD touch screen for intuitive operation, it boasts high sensitivity, fast testing speed and excellent data repeatability. It also supports data storage, historical record query and result printing. With high automation and user-friendly design, it is a common device for routine trace moisture testing.

2. Test Objectives

  Accurately determine the trace moisture content of test samples so as to control product quality and operational safety. This test is conducted strictly in accordance with the Karl Fischer Coulometric Titration principle using the SH103 Trace Moisture Analyzer. The high precision of the instrument ensures authentic, accurate and reliable test data.

3. Test Preparation

3.1 Test Samples： Test samples (liquid, gas or solid, selected according to actual test objects)

3.2 Instruments and Accessories

1. Main unit of SH103 Trace Moisture Analyzer

2. Matching electrolytic cell, electrolytic electrode and measuring electrode

3. Microsyringe, silicone pad, indicator silica gel and magnetic stir bar

4. Special Karl Fischer electrolyte, absolute ethanol, acetone and other auxiliary reagents

4. Operating Procedures

1. Inspect the appearance of the instrument, electrodes, pipelines and drying tubes. Confirm that the silica gel is still effective and all electrodes are firmly connected. Assemble the electrolytic cell as required and pour a sufficient amount of electrolyte into it.

2. Connect to AC220V power supply and turn on the instrument. The device will start up automatically and enter the home interface. Tap the screen to access the function selection page.

3. Set relevant parameters as required: adjust system time and sample serial number, and enable or disable the automatic printing function as needed. Select the corresponding calculation formula (F0, F1, F2) based on sample type, and set stirring speed, sample volume, mass, density and other basic parameters.

4. After parameter configuration, enter the test interface. Turn on stirring and electrolysis functions. The instrument will start stirring and electrolyte balancing. When the screen shows "Balanced", the electrolyte preparation is completed.

5. Draw the test sample with a microsyringe. Insert the needle into the electrolyte and inject the sample slowly, then tap the test button to start detection. Avoid touching the inner wall of the electrolytic cell and electrodes with the sample to prevent deviation of test results.

6. The instrument will perform electrolytic titration automatically. A buzzer will sound upon test completion, and the moisture content value will be displayed on the screen directly. Print the test report if needed. All test data will be automatically saved to the instrument’s historical records.

7. For continuous testing, proceed with the next sample directly after one test is finished. Upon completion of all tests, cut off the power supply, clean the electrolytic cell, electrodes and pipelines, and store all equipment and accessories properly.

5. Data Analysis and Result Evaluation

  The sensitivity of the SH103 Trace Moisture Analyzer reaches 0.1 μg H₂O. For moisture content ranging from 10 μg to 1 mg, the test error is only ±3 μg. For moisture content above 1 mg, the error is controlled within 0.3% (excluding sampling error).

  Multiple parallel tests on the samples show favorable data repeatability and stable results, which fully meet the accuracy requirements for trace moisture testing in various industries. Featuring stable operation and simple operation, the instrument is applicable to routine batch testing and high-precision laboratory analysis.