Infrared carbon monoxide and carbon dioxide analyzer is a commonly used equipment for gas detection and environmental monitoring, widely used in industrial emissions, environmental air quality monitoring, combustion process control and other fields. It mainly uses infrared absorption spectroscopy to determine gas concentration, and has the characteristics of high sensitivity, fast response, and non-destructive. However, regular calibration and accuracy analysis are essential to ensure its detection accuracy and stability.

1、 Calibration method

to ensureInfrared carbon monoxide and carbon dioxide analyzerThe accuracy of the measurement must be calibrated regularly. Calibration is usually achieved by introducing a known concentration of standard gas into the analyzer and adjusting the reading to match the concentration of the standard gas. The calibration process mainly includes the following steps:

1. Selecting standard gases: Calibration requires the use of standard gases with known concentrations, which are usually provided by professional gas suppliers. The accuracy and stability of gas concentration are crucial. For carbon monoxide and carbon dioxide, a mixture of gases containing known concentrations of CO and CO ₂ is often used as a standard.

2. Gas introduction and regulation: During the calibration process, standard gas is introduced into the measurement chamber. At this point, adjust the reading to ensure that the displayed concentration value is consistent with the concentration value of the standard gas. Multi point calibration is usually required at different concentration levels to ensure accuracy across the entire range.

3. Baseline calibration: During calibration, it is usually necessary to perform baseline calibration, which involves removing any possible deviations from the instrument. Baseline calibration can be performed by introducing pure zero gas, which ensures that the reading is zero in the absence of gas.

4. Multi point calibration and verification: To ensure accuracy at various concentrations, multi-point calibration is usually required. Verify linearity and accuracy by comparing the measured values of different concentration standard gases with actual values multiple times.

2、 Precision analysis

Precision analysis is a comprehensive evaluation of instrument performance to ensure that it can provide accurate measurement results in practical applications. The accuracy of an infrared carbon monoxide and carbon dioxide analyzer usually includes the following aspects:

1. Repeatability

Repeatability refers to the consistency of measured values for the same gas concentration under the same conditions. Poor repeatability can lead to fluctuations in measurement results, affecting the reliability of the data. To test repeatability, it is usually necessary to measure gases of the same concentration multiple times and calculate the standard deviation of the measurement results. It is generally required that the repeatability of the instrument be within a small error range.

2. Linearity

Linearity refers to whether the relationship between the output signal and gas concentration is linear. Ideally, the output should be proportional to the gas concentration. Through multi-point calibration, linearity can be evaluated to ensure that the measurement results over the entire range accurately reflect the actual concentration.

3. Response time

Response time refers to the time required from the introduction of a gas sample to the display of a stable reading. The typical response time is between a few seconds and several tens of seconds. A shorter response time can ensure real-time monitoring and fast feedback, but it also requires a balance between accuracy and response speed.

4. Drift

Drift refers to the change in measurement error that occurs during long-term use. Drift can be caused by factors such as environmental temperature changes, sensor aging, and light source attenuation. Regular calibration and maintenance can effectively reduce the impact of drift. To test drift, it is usually necessary to repeatedly measure the same gas concentration over a period of time and observe its trend of change.

Infrared carbon monoxide and carbon dioxide analyzer is an efficient and accurate gas detection tool, but its measurement accuracy is affected by multiple factors, including calibration process, instrument repeatability, linearity, response time, drift, and cross interference. Regular calibration and accuracy analysis are crucial to ensure high precision and stability during use. By using the correct calibration method and accuracy evaluation, the analyzer can ensure reliable data support in various applications, meeting the needs of industrial and environmental monitoring.