IR CO2 Transmitter with Display, 0-2000/5000/10000ppm

Carbon dioxide transmitters typically employ NDIR (non-dispersive infrared) detection principles, measuring concentration by leveraging CO₂'s absorption characteristics at specific infrared wavelengths. As gas passes through the detection chamber, the sensor converts signal changes in light intensity into concentration values. Internal circuitry then outputs signals in formats such as 4–20mA, 0–10V, or RS485.

Most CO₂ transmitters incorporate an Automatic Baseline Calibration (ABC) function that automatically references the lowest concentration under normal ventilation conditions to maintain long-term accuracy. If installed in environments with persistently high CO₂ levels (e.g., greenhouses or livestock facilities), it is recommended to disable automatic calibration and perform regular manual calibration using 400ppm standard gas or zero air. Calibration intervals typically range from 6–12 months, depending on the operating environment and required precision.

When installing a CO₂ transmitter, position it in areas where people are present or at representative air locations, approximately 1–1.5 meters above the floor. Avoid proximity to doors, windows, air conditioning vents, fresh air ducts, and strong heat sources to prevent reading fluctuations. In industrial environments, ensure no corrosive gases or dust clog the sensor. For indoor applications, maintain good ventilation to achieve more stable and reliable CO₂ measurement data.