The fully automatic UV fluorescence sulfur analyzer is mainly used to determine the content of trace sulfur elements in petroleum, fuel oil, coal, chemicals, etc. The ultraviolet fluorescence method is based on the emission of specific wavelength fluorescence spectra of sulfides under ultraviolet light irradiation, and quantifies sulfur content by measuring the fluorescence intensity. The measurement procedure usually includes the following steps:
1、 Instrument preparation
Equipment inspection:
Check the appearance of the fully automatic UV fluorescence sulfur analyzer to ensure that all components are intact and the power cord connection is not loose.
Set up calibration instruments, including operating systems, control panels, displays, and other control interfaces.
Calibration and preparation of standard materials:
Use standard samples with known sulfur content for instrument calibration. The standard sample should comply with national standards and have a known sulfur content.
Regularly check the expiration date of standard solutions to ensure the freshness of standard substances.
2、 Preparation for measurement
Sample pre-treatment:
The sampling amount of the sample must comply with regulations, and the sampling method should be representative.
For liquid samples, they can be used directly; For solid samples, it is necessary to crush, dissolve, and other treatments to make them suitable liquid samples for measurement.
If the sample contains impurities, pre-treatment is necessary to avoid interference with the measurement results.
Sample injection system:
Inject the sample into the injection port of the measuring instrument to ensure stable injection volume and flow rate of the sample. Different instruments may have different injection methods, such as liquid injection or gas injection.
Choose the appropriate measurement range:
Select an appropriate measurement range based on the expected sulfur content of the sample to avoid inaccurate measurements caused by the sample exceeding the instrument's measurement range.
3、 Measurement process
Instrument start-up and preheating:
Start the instrument and preheat it. The UV fluorescence analyzer requires a certain amount of time to stabilize the light source and detection system, ensuring the accuracy of the test data.
Set parameters:
Set measurement mode, time, wavelength and other parameters. According to the properties of the sample (such as oil, gas, solid, etc.), it may be necessary to adjust the corresponding wavelength and measurement time.
Ensure that the sensitivity, baseline setting, and gain adjustment parameters of the instrument are within a reasonable range.
Start measuring:
Activate the automatic sampling system to allow the sample to flow into the optical analysis area, and the instrument will automatically activate the ultraviolet light source to irradiate the sample.
The sulfur element contained in the sample absorbs ultraviolet light and emits fluorescence of a specific wavelength, and the fluorescence signal is received by the detector.
The instrument calculates the sulfur content in the sample based on the relationship between the fluorescence signal intensity and the standard curve.
4、 Result processing and reporting
Data processing:
The built-in software of the instrument automatically converts the detected fluorescence signal into sulfur content, usually measured in ppm (parts per million) or mg/kg.
If the sulfur content in the sample is high, it may be necessary to dilute the sample or choose a higher measurement range.
Result report:
The measurement results should be recorded and a test report should be generated, including sample number, testing time, sample type, measurement results, units, and other information.
For non-conforming samples or abnormal measurement results, retesting or re examination is required.
5、 Instrument calibration and maintenance
Calibration and Verification:
Regularly use standard sulfur solution or standard samples for instrument calibration to ensure stable instrument performance.
Regularly perform zero point calibration and sensitivity calibration to prevent measurement errors caused by instrument drift.
Instrument cleaning and maintenance:
Regularly clean optical systems, detectors, injection ports, and other components to prevent sample residue or impurity contamination.
Check and replace damaged components such as light bulbs, filters, etc.
6、 Precautions
Sample dissolution:
When dissolving solid samples, a suitable solvent should be selected to avoid impurities in the solvent affecting the measurement results.
Environmental conditions:
Ensure that the laboratory temperature, humidity, and other environmental conditions meet the requirements of the instrument, and avoid environmental factors interfering with the measurement results.
Instrument calibration frequency:
Regularly calibrate according to usage frequency. Generally, calibration is conducted once a month or quarter to ensure measurement accuracy.
summary
The measurement procedure of the fully automatic UV fluorescence sulfur analyzer includes the entire process from equipment preparation, sample processing to data processing and report generation, aiming to ensure the accuracy and reliability of the measurement results. By standardizing operations, instrument errors can be effectively reduced and higher quality test results can be obtained.