The calibration of Zefon air samplers is a complex and delicate process that covers multiple stages from the laboratory to the field. Through standardized operations, the measurement accuracy and reliability of the sampler in various environments can be ensured, ensuring the accuracy of monitoring data. This is not only crucial for environmental monitoring, but also provides scientific basis for decision-making in related fields. Regularly calibrating the sampler can not only improve the reliability of the data, but also help extend the service life of the equipment and improve overall work efficiency.
1、 The necessity of calibration
Air samplers are used to collect data on gases or particulate matter in the air, which is typically used to assess air quality, control pollution sources, or conduct scientific research. If the sampler is not working accurately, it will directly affect the monitoring results, thereby affecting decision-making and subsequent actions. Therefore, to ensure the reliability of the data, it is particularly important to regularly calibrate the air sampler.
2、 Preparation before calibration
Before calibrating the air sampler, some preparation work needs to be done. Firstly, ensure that the functionality of the sampler itself is intact. Check the battery level, sensor status, and all interface connections for normal operation. Secondly, prepare standardized gases or gas mixtures, which will serve as benchmarks for use in the calibration process. Usually, the concentrations of these gases are precisely measured to ensure high precision in the calibration process.
3、 Laboratory calibration steps
1. Equipment preparation and preheating
In the laboratory, the Zefon air sampler is first preheated to ensure stable operating temperature and humidity. The preheating time of the equipment is usually between 30 minutes and 1 hour, and the specific time depends on the type of equipment and laboratory environmental conditions.
2. Connect standard gas
Connect the calibration gas cylinder to the input of the sampler and control the flow rate stability through a gas flow meter. The stability of flow directly affects the performance of the sampler, so this step is very important. The concentration of standard gas should meet the calibration requirements and match the concentration range required by the sampler.
3. Calibration Procedure
Under the condition of standard gas input, the output value of the sampler is read by a calibration device and compared with the preset concentration of the standard gas. If there is a difference between the reading of the sampler and the concentration of the standard gas, it is necessary to adjust the sensor sensitivity of the sampler or modify its algorithm model.
4. Multi point calibration
To ensure the accuracy of the sampler within different concentration ranges, perform multi-point calibration. Usually, at least three different concentration points (low concentration, medium concentration, high concentration) are selected for comparative calibration. Through multi-point calibration, it can be ensured that the sampler has good linear response and accuracy in actual environments.
5. Record and analyze data
After calibration is completed, it is necessary to record and analyze the calibration data of the sampler to ensure that all data during the calibration process meets the standard requirements. For situations with significant deviations, further adjustments or repairs are required, and recalibration is necessary.
4、 On site calibration steps
After laboratory calibration, the next step is to apply the calibrated sampler to the actual environment for on-site calibration. This step ensures that the sampler can still operate stably in complex on-site environments.
1. Environmental preparation
The environmental conditions on site often differ significantly from those in the laboratory. Factors such as temperature, humidity, and wind speed can all affect the measurement accuracy of the sampler. Therefore, during on-site calibration, it is necessary to ensure that the sampler is in a representative position and avoid being too close to the pollution source or areas with excessive wind speed, so as not to affect the measurement results.
2. On site calibration and adjustment
When calibrating on site, first use standard gas to recalibrate the sampler to ensure its sensitivity and accuracy. If any deviation is found, make appropriate adjustments immediately until the reading of the sampler approaches the standard value.
3. Data monitoring and recording
During on-site calibration, it is also necessary to regularly check the working status of the sampler and record the data after each adjustment. Comparing on-site data with laboratory data can help determine whether the equipment is working stably and whether further maintenance is needed.
4. Calibration certificate and report
After completing on-site calibration, relevant personnel need to issue a calibration certificate and attach a detailed calibration report. This report includes the calibration process, data comparison, adjustment status, etc. of the equipment, providing a basis for subsequent quality management and equipment tracking.