Hydrogen chloride, also known as hydrochloric acid, chemical formula HCL, is a colorless irritating smell of gas and corrosive. Concentrated hydrochloric acid is highly volatile. If it leaks, it will have irritating effects on human respiratory tract, mucous membrane, skin, eyes, etc., and it also has a suffocating smell. Industrial production of hydrogen chloride is often used in dyes, pharmaceuticals, chemicals, fertilizers, etc. Due to the special nature of hydrogen chloride, it is both a toxic gas and a corrosive gas.

Hydrogen chloride is mainly used for making dyes, fragrances and drugs, various chlorides and corrosion inhibitors. There are many sources of hydrogen chloride: the production of chlorinated paraffin, iron and steel industry, paper mills, electroplating industry, oil, lipoic acid production, electrolytic sodium chloride production of caustic soda, electrolytic potassium chloride production of potassium hydroxide, ethylene production of vinyl chloride, alkane production of chloroalkane, benzene chlorination to produce hexachlorobenzene, etc., these production processes will produce hydrogen chloride waste gas.

In addition to the various uses of hydrogen chloride, it is also harmful to the human body, hydrogen chloride first with its impact and corrosive damage to the human body. Because of the strong impact of hydrogen chloride, people can not tolerate its high concentration, must pay attention to avoid its inhalation, so the inhalation of high concentrations of hydrogen chloride is less. Gaseous hydrogen chloride affects the mucosa, can produce nasal septum ulcers, affect the eyes cause conjunctivitis and superficial keratitis; affect the skin can cause temporary effects of inflammation. Olfactory concentration, 1ppm, greater than 2.5ppm is harmful to human body. The state stipulates that the allowable concentration of operation is 5ppm, and 9ppm starts to present obstruction, but it can be tolerated for six hours. 10ppm beginning has an impact, 35ppm concentration, can endure 10 minutes, but cause sneezing affect the throat, hoarse voice, a sense of suffocation and chest pressure. 10-50ppm, can work, if inhaled for a long time can not work. 40-90ppm, can endure 0.5~1 hours, the future does not present obstruction. 1000-1350ppm is at risk within 0.5~1 hour. 1250-1750ppm, in 0.5~1 hours after the death or 1 hours after the death.

At present, the effective prevention method: in addition to the daily protection measures and operation standards, it is also necessary to install hydrogen chloride gas detector in the area where hydrogen chloride is used and stored or its adjacent area. When the gas concentration exceeds the national specified value, sound and light alarm will be given, and the fan will be linked on site to avoid accidents. The core device inside the hydrogen chloride gas detector is the hydrogen chloride sensor. The hydrogen chloride sensor converts the sensed hydrogen chloride concentration into an analog current signal and transmits it to the controller unit. The analysis is converted into a digital form and displayed on the liquid crystal screen of the instrument. Therefore, the normal use and measurement accuracy of the hydrogen chloride sensor are the keys to accurate measurement of the hydrogen chloride detector. Therefore, the hydrogen chloride sensor itself must have ultra-high sensitivity, resolution and good repeatability, linear. The British Alphasense hydrogen chloride sensor HCL-A1/B1, which is represented by Shenzhen, has ultra-high resolution, sensitivity and good linearity, and is suitable for hydrogen chloride gas detection projects in various chemical industrial sites. Moreover, the sensor itself does not need to add additional bias voltage, which can greatly reduce the input cost of the project. The main parameters are as follows:

Sensitivity: 50 ~ 140nA/ppm

Response time:<300s

Resolution:<1ppm<!--<-->

Size: 20.2*16.5

Working temperature:-30~50 ℃

Working humidity: 15 ~ 90% RH

Load resistance: 10 ~ 33Ω