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Metrics Instruments can help you design intrinsically safe (I.S.) instruments for use in hazardous environments. One of the challenges in designing electronic instruments for areas where explosive gases are present is prevention of sparks during product failure due to the storage of excessive electrical energy in certain components.

Two ways to solve this problem are either to enclose the entire instrument in an explosion-proof box, resulting in more expensive and bulkier products, or to simply design the circuitry at the board level such that no section of the circuit is allowed to store enough energy to generate sparks. The latter application typically requires the use of an I.S. barrier that limits the current consumption of the circuit.

There are different classifications for hazardous locations depending on the potency of the explosive gases present, and the European Community has a different set of requirements than North America.

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