FEM-approved NO₂ monitor that uses the technique of direct absorption of 405 nm light by NO₂ molecules. The Model 405 nm also measures NO by conversion to NO₂ using ozone. The instrument provides a total measurement of NO_x as the sum of NO and NO₂.

• 0-10 ppm for NO₂, 0-2 ppm for NO and NOx with a precision of < 1 ppb
• EPA certified (FEM) for NO₂ compliance monitoring (EQNA-0217-243)
• Extremely selective – No species found in ambient air has significant absorbance at the 405 nm wavelength

Overview

• Highly selective direct measurement of NO2 by absorbance at 405 nm (FEM EQNA-0217-243)
• Wavelength of 405 nm chosen becuase no other species found in ambient air has significant absorbance at that wavelength
• Nitric oxide (NO) is measured by conversion to NO2 using the reaction of NO with ozone
• Patented folded cell design achieves a path length of ~2 m, enabling a detection limit of <1 ppb
• Ideal for applications that require precise and accurate measurement of NO and NO2, such as air quality monitoring both outdoors and indoors
• Portable and relatively low power, making it particularly well suited for field deployments

Features

• Measurement of NO₂ over the range 0-10 ppm; measurement of NO over the range 0-2 ppm
• Federal Equivalent Method (FEM) for NO₂ over the ranges 0-500 ppb and 20-30°C (EQNA-0217-243)
• Measurement frequency of once every five seconds, with selectable averaging times of 1 min, 5 min, and 1 hour
• Three measurement modes: NO₂ only; NO only; or NO, NO₂, and NO_x
• SD card for virtually unlimited, portable data logging
• Power consumption: ~16 watts after warmup
• Long-Life pump (~15,000 hours)
• DewLine for elimination of any water vapor interference, a unique feature of 2B Tech instruments