GSD 19 is a stand-alone device for continuous detection of NO2 concentration in ambient air. It has temperature, pressure and humidity compensation built in and 0 to 5 ppb : 10 µg/m3 detection limit and 0-500 ppb : 0-1000 µg/m3 measuring range for ambient air monitoring. And higher for WHS purposes. This device has a wide operating temperature which make it suitable for outdoor atmospheric conditions.
Some of outstanding features on GSD 19 NO2 monitor are active sampling by a fan, opposed to diffusion sampling, as well as internal zero adjustment cycle to compensate any signal drift.