Which is good for fully automatic gaseous nitric acid

The measurement of nitric acid concentration in the atmosphere is carried out using wet chemistry method. Adopting dual channels, one channel collects HONO and interfering substances, while the other channel collects HONO+interfering substances+HNO3. Reduce nitrate to nitrite using cadmium reduction method. The nitrite obtained from the two routes reacts with sulfonamide to form a diazonium salt solution, which is then mixed with a dye solution of naphthylethylenediamine hydrochloride to form an azo dye. Azo dyes pass through a long path absorption tube to obtain the concentration of nitric acid by measuring the absorbance of specific wavelengths of light.

Instrument features:

Automatic degassing system，Avoiding interference from bubbles on the instrument；

Liquid level alarm protection system，Prevent liquid from being sucked into the flow controller（MFC）, vacuum pump, etc；

automaticzero adjustment，Effectively check the stability of the instrument and whether the real-time concentration obtained is accurate.