NDIR Gas Detector

NDIR gas detectors measure gas concentration in ambient air and process streams using non-dispersive infrared absorption technology. Industrial safety teams, environmental monitoring agencies, HVAC system engineers, and military facility managers across Pakistan use NDIR gas detectors for accurate, long-life gas detection. In contrast to electrochemical alternatives, NDIR sensors require no reagent replacement and deliver significantly longer operational lifespan.

The detector directs infrared light from a broadband source through a sample gas cell. Target gas molecules absorb infrared radiation at characteristic wavelengths specific to each gas species. A narrowband optical filter then passes only the target absorption wavelength to the photodetector. As a result, the detector measures light intensity reduction proportional to gas concentration in the sample cell. Additionally, a reference channel at a non-absorbing wavelength compensates for source intensity drift and optical contamination over time. Consequently, this dual-beam design maintains calibration stability without frequent manual recalibration across extended monitoring deployments.

Common target gases include carbon dioxide, carbon monoxide, methane, propane, ethanol, and refrigerant gases. Each requires a specific optical filter matched to its absorption wavelength. For example, CO2 sensors cover 0 to 5000 ppm for indoor air quality monitoring. Similarly, methane sensors cover 0 to 100% LEL for combustible gas safety applications. Furthermore, response time runs between 15 and 60 seconds for 90% of full reading. In addition, sensor lifespan extends between 5 and 15 years without reagent replacement, reducing total maintenance cost significantly.

Output interfaces include analog 4-20mA, 0-10V, and digital Modbus RTU, I2C, and UART protocols. These connect directly to building management systems, SCADA platforms, and industrial process controllers. Moreover, operating temperature range covers -20°C to +60°C on industrial-grade models. Finally, automatic baseline correction on quality NDIR detectors maintains long-term zero stability across continuous monitoring installations throughout Pakistan’s industrial, commercial, and military facility environments.

Tactical Supply Pakistan supplies NDIR gas detectors to industrial safety teams, building automation engineers, environmental monitoring agencies, HVAC system integrators, and military facility management programs requiring accurate, long-life gas detection capability across indoor air quality, process safety, and environmental monitoring applications throughout Pakistan.