Thermistor gas sensor is a commonly used type of gas sensor, which is widely used in many fields such as industry, chemical industry, electric power, machine tool and metallurgy. The thermistor gas sensor is a measuring bridge composed of two arms of the thermistor bridge, which has the advantages of accurate measurement, easy maintenance and flexible use. Today, Sideley Xiaobian will introduce the thermistor gas sensor to you in detail, hoping to help you.
Thermistor gas sensor This sensor uses a thermistor as the bridge's two arms to measure the bridge. When the thermistor is heated to 150-200 ℃ with a current of 1011, F, once it comes into contact with flammable gas bodies such as methane, the temperature changes due to different thermal conductivity (or in the case of the same current heating, due to the different gas environments of FI and FZ, their thermal conductivity conditions are inconsistent resulting in different temperatures), The resulting resistance changes throw the bridge off balance. The size of the bridge output signal reflects the type or concentration of the gas being measured. NMB pressure sensor
Generally, the gas that reaches a certain concentration in the air and touches the spark that can cause combustion is called flammable gas. List the main combustible gases and their explosive concentration ranges. The minimum value of the concentration range causing the explosion is called the lower explosive limit; The maximum value is called the upper explosion limit. MSI pressure sensor
Structure and measurement circuit principle of contact combustion gas sensor. A contact combustion gas sensor is formed by burying a metal coil such as platinum in the oxidation catalyst. Generally, a current is passed in the metal coil to keep it in a high temperature state of 300 to 600 ° C. When the combustible gas is in contact with the sensor surface, the combustion heat further increases the temperature of the wire, thus increasing the resistance value.
