The fully automatic micro moisture analyzer (also known as the automatic Kjeldahl nitrogen moisture analyzer) is commonly used to accurately determine the moisture content in samples and is widely used in fields such as pharmaceuticals, food, chemical engineering, and environmental monitoring. The following are the general operating steps of a fully automatic micro moisture analyzer:
1. Preparation work
1.1 Checking Instruments
Ensure that the fully automatic micro moisture analyzer has been correctly installed and is in normal working condition.
Check if the power supply, heating system, condensing system, and computer interface of the instrument are functioning properly.
1.2 Calibration Instruments
Use standard moisture samples or standard solutions for instrument calibration. Ensure that the instrument can accurately measure moisture content.
If the instrument is equipped with a standard liquid (such as a standard aqueous solution), calibrate according to the instrument instructions.
1.3 Preparation of Samples
Ensure uniform quality of the sample and minimize surface moisture absorption as much as possible. The particle size and morphology of the sample should meet the requirements of the instrument.
If it is a powder, granular or liquid sample, ensure that the sample container is suitable for placing the instrument.
1.4 Select Measurement Mode
According to the requirements of the measurement, choose the appropriate measurement mode (such as direct moisture determination, titration determination, etc.).
2. Operation steps
2.1 Start the instrument
Turn on the power of the fully automatic micro moisture analyzer and start the software interface.
Enter the required testing parameters (such as accuracy of target moisture content, testing temperature, time, etc.).
2.2 Selection of Measurement Methods
Choose the appropriate measurement method according to your needs. Common methods include:
Karl Fischer titration method (KFT)
Heating/drying method
Evaporation method, etc.
Set measurement time, temperature, and standard reaction mode (if necessary, set relevant formulas or testing conditions).
2.3 Selecting Sample Containers
Select the appropriate measuring container based on the type of sample and ensure that the container is clean and dry.
Use specialized micro sample bottles or other containers that can fit into the instrument.
2.4 Loading Samples
Accurately weigh a certain amount of sample, usually between a few milligrams and a few grams, and add the sample according to the requirements of the instrument.
Place the container containing the sample into the measuring position of the instrument, ensuring good contact between the sample and the heating zone of the instrument.
2.5 Setting Test Parameters
On the control panel or software interface of the instrument, set the following parameters:
Sample weight: manually inputted or automatically weighed.
Target moisture content: Set the moisture content range of the sample.
Temperature: Set the temperature required during the testing process (adjusted according to the characteristics of the sample).
Test time: Set the measurement time or preset moisture content.
Calculation method: Choose an appropriate calculation method (such as difference method, regression method, etc.).
2.6 Startup Test
Click the "Start" button to start the testing process of the fully automatic micro moisture analyzer.
The instrument will automatically heat the sample, control temperature and humidity changes, and evaporate or measure moisture.
2.7 Monitoring process
During the testing process, the instrument will display real-time data such as water evaporation rate, current water content value, etc. Monitor the working status of the instrument to ensure that no abnormalities occur.
3. Test completion and data recording
3.1 Measurement completion
After the measurement process is completed, the instrument will automatically stop operating and provide the measurement result of moisture content.
The instrument will automatically perform data analysis and display the final results on the screen.
The test results can be exported as tables or charts, recorded in the system or printed out.
3.2 Result Confirmation
Carefully verify the test results to ensure there are no errors. If the test results are abnormal, the experiment can be repeated or the measurement parameters can be adjusted.
3.3 Cleaning and Organizing
After the measurement is completed, the instrument should be cleaned in a timely manner, including cleaning the heating area, sample container, and surrounding equipment.
Regularly maintain and calibrate the instruments to ensure that they are always in good working condition.
4. Precautions
4.1 Sample Preparation
The sample needs to be kept as dry as possible to avoid external moisture affecting the test results.
For different substances, choose appropriate containers and measuring ranges. Liquid samples usually require additional attention to the volatility of solvents.
4.2 Instrument Calibration
Regularly calibrate instruments using standard moisture liquids or samples with known moisture content to ensure the accuracy of measurement results.
4.3 Temperature Control
Ensure stable temperature control during the heating process, as excessively high temperatures may lead to incomplete sample decomposition or water evaporation.
4.4 Data Recording
Record the specific parameters measured each time, including sample number, test temperature, humidity, and final moisture content.
4.5 Instrument maintenance
Regularly check the heating system, condensing system, and weighing part of the instrument to avoid damage due to prolonged use.
5. Common problems and troubleshooting
Unstable test results: This may be due to uneven sample distribution, changes in external humidity, or instrument calibration issues. Please check the sample and instrument settings.
High or low measurement value: Check whether the temperature control system and heating system of the instrument are normal to ensure that the sample size is appropriate.
6. Summary
The fully automatic micro moisture analyzer can quickly and effectively test the moisture content in samples through automated operation and precise measurement technology. Mastering the correct operating steps and maintenance procedures can help improve the accuracy of test results and the lifespan of the instrument.