l The instrument can be equipped with dozens of kinds of sensors such as electrochemical, catalytic, non-dispersive infrared (NDIR) and photo-ionization detector (PID) sensors in order to meet users’ different demands;

l The instrument can not only display the concentration of a dangerous gas in real time but also calculate the TWA and STEL values of a toxic gas and display the results on the LCD as per corresponding instructions;

l The instrument possesses analog, digital and on/off signal outputs simultaneously;

l The ultra-large LCD screen is equipped with ultra-bright backlight, convenient for reading;

l  Its Protection Classification can exceed IP66;

Sulfur Dioxide - SO2 

Hazard:                       Flammable       Will not explode

Classification:           Health                Extremely toxic 

Oxidizing agent

Synonyms:                Sulfurous acid anhydride, sulfurous oxide, and sulfur oxide

Exposure limits:       (OSHA) PEL\TWA: 5 ppm

                                    (ACGIH) STEL: 0.25 ppm/ 15 min

                                    (OSHA) IDLH: 100 ppm / 30 min  

Industries:                 Pulp and paper mills, and coal fired generating stations 

Sulfur dioxide is a colorless gas with a characteristic, irritating, pungent odor. Sulfur dioxide is released when compounds containing sulfur, such as fossil fuels like coal are burned.

Sulfur dioxide is a highly toxic gas which poisons its victims via inhalation through the lungs. SO2 combines with water to form sulfuric acid (H2SO4). It is for this reason sulfur dioxide can burn the respiratory tract upon inhalation. High doses of sulfur dioxide can cause death quite rapidly.

Effects of Various SO2 Levels  

Sulfur OxideLevel in PPM         Resulting Conditions on Humans

.3-1                                     Sulfur Dioxide initially detected by taste

5                                          Permissible Exposure Level (OSHA)

3                                          Odor becomes easily detected

6-12                                    Irritation of the nose and throat

20                                        Irritation of the eyes

50-100                               Maximum exposure for a 30 minute period

400-500                             Dangerous concentration can cause edema of the lungs and glottis and death from prolonged exposure