Ultrapure water instrument is an instrument used for water analysis and testing, and its main purpose is to measure the concentration of various ions, trace elements and organic substances in water samples.
It is widely used in environmental monitoring, food hygiene, biomedicine and other fields.
To ensure the accuracy and reliability of the ultrapure water instrument, it needs to be calibrated before use.
1.Calibration items: The calibration of ultrapure water instrument mainly includes measurement accuracy, instrument sensitivity and stability.
Accuracy refers to the degree of discrepancy between the output of an instrument and a known standard value;
Sensitivity refers to the ability of the instrument to detect trace substances;
Stability refers to the degree to which the output of an instrument fluctuates over a long period of time.
2.Calibration method: The calibration of ultrapure water instrument usually adopts two methods: comparison of standard samples and instrument self-test.
1) Standard sample comparison: Use a standard sample of known concentration for proofreading, and obtain the error between the measurement result of the instrument and the standard value.
The accuracy of the instrument can be evaluated by comparing the results.
When comparing standard samples, the samples need to be measured under the same temperature and pressure conditions as the ultrapure water meter to ensure that the results are comparable.
For calibration, multiple concentrations of standard samples can be used to determine how the instrument behaves at different concentrations.
2) Instrument self-test: The ultrapure water meter is generally designed with an automatic calibration function, and the instrument can be calibrated by starting the self-test program.
The self-test program detects and calibrates important parameters of the instrument, such as temperature, pressure, conductivity, etc.
The sensitivity and stability of the instrument can be evaluated by means of a self-test.
After completing the self-test process, the instrument will give the self-test results and calibration recommendations.
3.Calibration cycle: The calibration cycle of an ultrapure water meter depends on the frequency and importance of the instrument.
Generally speaking, for ultrapure water meters that are frequently used or require high measurement results, it is recommended to perform a detailed calibration once a year;
For the less used ordinary ultrapure water instrument, the calibration period can be appropriately extended according to the actual situation.
4.Verification records and results: During the verification process, you need to record the values and results of each verification parameter.
The calibration record should include the calibration date, calibration personnel, calibration method, calibration standard sample information, etc.
The calibration result should indicate whether the calibration parameters are qualified or not, and the error of the calibration result should be recorded.
In summary, the calibration of the ultrapure water instrument is an important part of ensuring the accuracy and reliability of the instrument.
Through two methods, standard sample comparison and instrument self-test, we can evaluate the measurement accuracy, sensitivity, and stability of the instrument.
Based on the calibration results, it can be determined whether the ultrapure water meter needs to be calibrated and adjusted accordingly.
The detailed recording of calibration records and results also has important reference value for the subsequent maintenance and use of the instrument.