NDIR Technology CO2 Sensor – Optimal Solution to Compliant with Latest ASHRAE 62.1-2022 Accuracy Requirements

Why NDIR CO2 Sensor is the Best Selection for DCV System?

In achieving energy efficiency and maintaining indoor air quality, the lasted published ANSI/ASHRAE Addendum ab to ANSI/ASHRAE Standard 62.1-2022 set more specific requirement for CO2 sensors incorporated within the DCV systems:

6.2.6.1.3.4 CO2 sensors shall be certified by the manufacturer to be accurate within ±75 ppm at concentrations of 600, 1000, and 2500 ppm when measured at sea level at 77°F (25°C). Sensors shall be factory calibrated and certified by the manufacturer to require calibration not more frequently than once every five years. Upon detection of sensor failure, the system shall provide a signal that resets the ventilation system to supply the required minimum quantity of outdoor air (Vbz) to the breathing zone for the design zone population (Pz).

It's worth noting that the latest ASHRAE 62.1-2022 put forward more stringent requirement for CO2 precise measurement of ±75 ppm at concentrations of 600, 1000, and 2500 ppm. Under this context, to realize high-accuracy feature of CO2 sensors becomes very critical.

NDIR technology-based CO2 sensor is optimal choice to achieve highly accurate measurement of indoor CO2 concentration level. Based on the Non-Dispersive Infrared technology principle, NDIR CO2 sensors can achieve a remarkable level of accuracy of ±75 ppm at concentrations of 600, 1000, and 2500 ppm by precisely designing the light source, filters, and optical path, across a wide temperature range . At the same time, NDIR CO2 sensors demonstrated the superior performance of being unaffected by vibration, as CO2 sensors used for DCV systems are usually placed near ventilation pipelines, where vibration cannot be avoided.

Furthermore, NDIR technology-based CO2 sensor also has the advantages of long lifespan, auto-zero-calibration mechanism, and continuous monitoring capability, making it ideal for DCV systems in compliance with ASHRAE standards.

Cubic, as the manufacturer of gas sensors and gas analyzers, has more than 20 years’ R&D dedication and accumulation in non-dispersive infrared (NDIR) technology and has innovatively developed superior reliable and credible NDIR CO2 gas sensors and monitors, capable of perfectly meeting new ASHRAE standards, to further assist intelligent ventilation and energy efficiency in buildings.