Analysis of low - energy arc discharge of d . c . resistive intrinsically safe circuits
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I " electrical apparatus for explosive atmospheres - intrinsically safe circuits and electrical apparatus " i
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Specification for electrical measuring instruments for use on intrinsically safe circuits in coal mines
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The equipment placed in the hazardous area contains only intrinsically safe circuits . a circuit is intrinsically safe if no sparks of thermal effects occur under establishedtest conditions ( including the normal operating and certain fault conditions ) , which could lead to the ignition of a given explosive atmosphere
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The portable infrared press instrument has the following characteristics : has small volume and weight and carry easily ; use a keyboard to input orders and display the corresponding information on the lcd display for the sake of the user ' s convenience ; has big data capacity and can collect 30 press measure instruments all the data which have stored for a week ; show the real - time date and time ; communicate through the infrared with speed of 2400kbps ; has the intrinsically safe circuit and can be safely used under coal mine
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