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020089

Air pollution sensor TPM-43B

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168,00UAH
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024565

Module<gtran/> M205 Gas leak sensor<gtran/>

Module M205 Gas leak sensor

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157,50UAH
149,60UAH
141,70UAH

025713

Sensor<gtran/> MQ135 gas leak sensor<gtran/>

Sensor MQ135 gas leak sensor

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168,00UAH
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142,80UAH

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028112

Sensor MQ-8

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84,00UAH
79,80UAH
75,60UAH

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028113

Socket Soket MQ 7 pin

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21,00UAH
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Gas impurity sensors - sensors for detecting the presence or measurement of the concentration of gas impurities of a certain type or groups of gases.

Basic types:

metal oxide
electrochemical
catalytic

Metal oxide sensors. The principle of operation is based on a change in the electrical conductivity of a semiconductor film due to gas adsorption on its surface. A thin layer of tin oxide (SnO2) doped with elements with catalytic properties (Pt, Cu, Ni, Pd) is deposited on a tubular alumina substrate to provide a higher sensitivity of the semiconductor to a specific type of impurity gas. When the sensor is heated to the operating temperature (approx. 400°C) with the help of a heating element made in a design with a sensor, oxygen contained in the air is adsorbed onto the surface of the sensor, which has a fine-grained structure. The course of adsorption depends on the concentration of the impurity gas. As a result of surface effects, the electrical conductivity of the sensor changes. The sensor response is expressed through the change in its resistance depending on the gas concentration, which changes the adsorption of oxygen on the sensor material. The speed of response depends on the sensor model and the specific impurity gas.

Electrochemical sensors can be solid or liquid. They are current cells with two electrodes. The basic components of two-electrode sensors are the measuring electrode, the counter electrode and the ion conductor between them. When a toxic gas (eg carbon monoxide) comes into contact with the measuring electrode, an oxidation reaction starts. In an ionic conductor, electrons move and a chemical reaction occurs on the opposite electrode. As a result of an electrochemical reaction, the cell creates a potential difference (EMF), which is the response of the sensor. The sensor detects the presence of gas by measuring the current between the two electrodes.

Catalytic sensors. Combustion of gas on a heated catalyst generates heat, which is measured by a gas sensor. So the principle of operation is based on the linear dependence of the released heat on the gas concentration. Such sensors are practically independent of the ambient temperature and humidity. Catalytic sensors consist of two elements: a detector and an inert compensator. Explosive gases only burn on a sensitive detector, which leads to an increase in temperature and, accordingly, resistance. Gases do not burn out on the expansion joint, its resistance and temperature remain unchanged.