Working principle of nitrogen dioxide sensor

Description :

　　Mining nitrogen dioxide sensors can be used in various situations underground in coal mines to continuously monitor, display, and alarm for nitrogen dioxide content in the airflow of goaf, mining face, return airway, and other places underground. At the same time, they output signals to provide monitoring data for monitoring substations.

　　Characteristics of nitrogen dioxide sensor products

　　The whole machine adopts a new type of microcontroller and integrated digital circuit, combined with high-precision temperature components, which has the characteristics of stable performance, high measurement accuracy, fast response speed, strong anti-interference ability, simple structure, and convenient use and maintenance.

　　Technical indicators of nitrogen dioxide sensor

　　Working voltage: 18V DC,

　　Allowable fluctuation range: (12-20) V;

　　Working current ≤ 95mA;

　　Large transmission distance: 2km;

　　The response time should not exceed 60 seconds;

　　Intrinsic safety parameters: Ui: 18.5 V; Ii：40 mA；

　　Technical parameters of nitrogen dioxide sensor

　　Test scope: 0~20 * 10-6

　　Measurement error: 0-9 ≤± 3 * 10-6, 10-20 ≤± 4 * 10-6

　　Response time: ≤ 45 seconds

　　Output characteristics: Display method: 4-digit LED digital display

　　Display accuracy: 1 * 10-6 Alarm range: 0~20 * 10-6 (1 * 10-6 per step)

　　Alarm mode: intermittent sound (sound level>80db) intermittent flashing (red)

　　Output signal: Current: DCLMA~5mA; 4mA~20mA； 200Hz~1000Hz (pulse width greater than 0.3ms)

　　Output signal format can be set with one transmission distance: 2Km

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