With the sustained and rapid economic development and the continuous improvement of the level of urbanization, my country's industry, agriculture, commerce and other undertakings have developed rapidly, especially the introduction of some new chemical synthetic products such as food, chemicals, and pharmaceuticals, urban sewage treatment plants, The construction of urban infrastructure such as garbage disposal sites and many other reasons, as one of the seven major environmental hazards in the world, has caused more and more disputes and cases in the society.

1. What is malodorous gas?

All the gas substances that stimulate the olfactory organs cause people to be unhappy and damage the living environment are called malodorous gases. Odor gas is mainly composed of ammonia, sulfide and methanol. can be roughly divided5Class: sulfur-containing compounds (e. g., hydrogen sulfide, thiols, thioethers); chlorine-containing compounds (e. g., amines, amides, indoles); halogens and derivatives (e. g.cl2, halogenated hydrocarbons); hydrocarbons (such as alkanes, alkenes, alkynes, aromatic hydrocarbons); oxygen-containing organic compounds (such as alcohols, phenols, aldehydes, ketones, organic acids, etc.).

      2.  Sources and hazards of malodorous gases

Malodorous gases mainly come from industrial and agricultural production departments and people's lives. For example, fecal odor, fish odor, rotten fruit odor, wild vegetable odor, etc. produced in the production and processing of agriculture and animal husbandry. Sulfides, hydrocarbons, aldehydes, ketones, benzenes, phenols, amines, tar, asphalt vapor, ammonia and various organic solvents produced in the petrochemical production process, as well as the stench of urban public facilities. High concentration of foul odorDyeThere is a direct harm to human health.

      3.  Sensor Introduction

      According to the National Emission Standard for Odor Pollutants (GB14554-1993), the substances to control the odor only include nine indicators, including ammonia, trimethylamine, hydrogen sulfide, methyl mercaptan, dimethyl sulfide, dimethyl disulfide, carbon disulfide, styrene, and the OU value of the odor.Therefore,Shenzhen Technology Co., LtdThe sensor selection in the recommend odor electronic online monitoring system is as follows:

NH3-B1 is a sensor based on electrochemical principles. It has the advantages of high sensitivity, good selectivity, and good linearity of low concentration output. At the same time, it performs well in extreme environments of low temperature, low humidity and high temperature and high humidity. It is very suitable for various ammonia detection occasions.

Hydrogen Sulfide SensorH2S-B4Main parameters:

Sensitivity:1450-2600nA/ppm

Reaction time:＜60s

Zero current:-250~200nA

Range:100ppm

Overload:200ppm

Linearity Error:±4ppb

PID-AH is a photoelectric ion detector,Designed for diffusion and in-line pumped sampling, it provides excellent response time and clearance, with extremely low background interference, and achieves the best low-end sensitivity while maintaining a wide dynamic range.PID-AHCan test thousands of species including trimethylamine and dimethyl disulfideVOCGas, very suitable for detecting malodorous gases.

      The ethylene oxide sensor (ETO sensor) ETO-B1 the main characteristics:

Measurement range:100ppm

Sensitivity:2000～3400nA/ppm

Response time:

Linear range: 0~40ppm, full range linearity error5~10ppm

Overload:500ppm

Resolution: <0.1ppm

Size: Φ32.3*16.5

Service life:2Year

Storage period:6Months