Attention, attention! For combustible gas detection sensors will be poisoning!

Combustible gas detector is widely used for process industry safety protection device. At present, a lot of in the use of detector for catalytic combustion type combustible gas detector. However, this type of detector is catalytic element toxicity, result in unable to realize, cause potential safety hazard, must therefore be taken seriously. Today, we will with the instrument and meter plant, take a look at the cause of sensor poisoning and protective measures. Poisoning cause in the process industry, a lot of chemicals will be absorbed by the catalyst or with catalyst reaction to form a new compound, thus inhibiting catalytic reaction, and even poison catalytic element and resulting in a decline in its sensitivity and even complete failure. Sensor for a long time work in environment with these chemicals, can produce the deactivation of catalyst poisoning, the sensitivity of the catalytic element dropped substantially, shorten the service life of components. The most common of these chemicals are mainly silicide and sulfide. 1, silicide silicide often exist in the lubricating oil, cleaning agents, adhesives, sealants and other compounds, used in great quantities in the petrochemical industry, could significantly inhibit the response of the sensor. Silicon compounds in concentration for PPM shall be sensor response will be less. Organic silicon in the environment of high temperature decomposition catalyst and catalyst surface to form solid matter, leading to the sensor sensitivity is reduced, and the higher concentration of organic silicon compound can make the sensor damage immediately. 2, sulfide was easy oxidation of sulfide mineral acid, corrosion catalytic element, serious when even result in catalytic component failure. Hydrogen sulfide and other sulfide, when oxidized into inorganic acid may be corrosion sensors. High temperature organic acids ( Such as acetic acid) Kind of steam, or direct exposure to acid ( Such as hydrochloric acid steam, steam) sulfate Can also be corrosion sensors. 3, in addition, other heavy metals such as mercury, lead, also have obvious inhibitory effect on catalytic element. Degreasing agent and detergent such as solvent, chlorinated hydrocarbon containing may affect the sensors. Some polymer plastic overheating when releasing toxic chloride, such as welding when the PVC line. 4, extent of damage is usually silicide is considered a poison material of catalytic combustion type sensor, or completely destroys the catalyst. And is regarded as inhibiting substance such as sulphur, namely only reduce the sensitivity of the measurement. Inhibit or reduce the influence of that may be related to the long-term, irreversible, also may be temporary, can recover. Prevention and treatment & other; Click here to view the kaidi instrument factory production to see more details & throughout; 1 choose poison resistance strong catalytic element. Studies have demonstrated that by chemical coprecipitation new-type catalysts, the preparation of composite metal oxide catalyst can improve the stability of the catalytic element surface. To improve the drug resistance of the element. But may be more poison resistance difference between different manufacturers products, choose better quality catalytic element can effectively improve the average trouble-free working time of combustible gas detector. 2 for poisoning can cause catalytic combustion type sensor material environment, should be the instrument of the getter pump room before entry or sensor equipped with filters. And according to the pollution situation, often to replace, or replaced immediately after exposure to toxic gas. 3 to avoid sensor contact silicide and sulfides. If you don't use contain silicone rubber, synthetic rubber, or sealant gasket, sealing and insulation components: not in assembly and storage equipment used in the environment of silicide in polish, cleaners and lubricant: gas transmission pipeline valves and other parts should avoid to use lubricant containing silicide: as far as possible not can use to paste the label of the instrument surface ( This kind of adhesive is often contains silicide) ； Installation, maintenance personnel do not use cosmetics containing silicone oil composition. 4 should be according to the actual situation, it is estimated that may leak gas concentrations, choose a suitable range of combustible gas detector, as far as possible to avoid the long time work under the environment of leakage gas concentration sensor. May reduce the exposure time of gas in the environment. Need not when can close the instrument.
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