NGN-2a

The Optec NGN-2a integrating nephelometer employs a unique open-air design that allows accurate measurement of the scattering coefficient (Bscat) of ambient air. With a direct, unobstructed path from the outside air to the optical measuring chamber, modification of the temperature, relative humidity, aerosols, and gases of the sampled ambient air are minimized. The NGN-2a features low power consumption, a rugged compact design, and easy installation and operation making it ideally suited for remote monitoring. The NGN-2a is an improved version of the NGN-2.

Continuous measurement of ambient Bscat using stable and long life silicon photodiode light detectors
Direct and unobstructed path from outside air to the measurement chamber minimizes the modification to the temperature, relative humidity, aerosols, and gases of the sampled ambient air
Modular design allows easy servicing and component replacement
13.8 volts at 20 watts power requirement allows for remote solar power installation
Internal computer monitors and controls operation, allows for flexible datalogger interface and diagnostics. Control and data logging program for Windows PC is supplied with free updates.
Automatic clean air and span gas calibrations at user-selected intervals
Three wire RS-232 at 9600 baud and two analog outputs available for data logging
Operates in ambient conditions so that an inexpensive climate-controlled sheltering is not required. The small size with minimal support requirements allow for easy installation on towers or existing shelter walls
LED lamp for very long life of approximately 50,000 hours and reduced power consumption. Effective wavelength is at 530 nm with a 40 nm band width. Other LEDs operating at different wavelenghts (470, 505 and 626nm) are available.