Infrared gas analyzer uses gas molecules to quantitatively analyze the characteristic absorption of specific wavelength infrared light, following the Lambert Beer law. By measuring changes in transmitted light intensity, gas concentration can be calculated, which has advantages such as high sensitivity, good selectivity, and fast response speed.

Calibration process and precautions:

Standard gas calibration preparation:

Standard gas selection and conversion:

Prepare a standard gas with a known concentration (such as 25000ppm CO ₂), paying attention to unit conversion (such as% LEL or% vol needs to be converted to ppm).

The instrument enters calibration mode:

Enter the calibration interface through the menu key (such as the SET key) to avoid directly introducing standard gas into the measurement interface and prevent data abnormalities.

Optical path and phase adjustment:

Phase synchronization:

Adjust the axis position of the cutting blade to ensure strict synchronization of the infrared light cutoff time between the reference edge and the measurement edge (phase difference of 180 °), ensuring that the output signal is minimized when zero gas (such as N ₂) is introduced.

Optical path balance:

If the intensity of two infrared beams is not equal, errors need to be eliminated by adjusting the optical path balance to avoid calibration deviation caused by energy differences.

Calibration operation steps:

Introduce standard gas:

Connect the standard gas to the analyzer through a pressure reducing valve to ensure stable flow (such as a 6mm nozzle adapter).

Enter calibration value:

Enter the concentration value of the standard gas in the calibration interface, and the instrument will automatically compare the measured values and adjust the linear parameters.

Verification and recording:

After calibration, different concentrations of standard gases need to be introduced to verify accuracy, and calibration data (such as date, standard gas batch, deviation value) should be recorded.