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How do "Intrinsically Safe" and "Explosion-Proof" transmitters differ?

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Instrinsically safe transmitters, by their design, limit the thermal and electrical energy to a point where ignition is not possible. In contrast, explosion-proof transmitters work on the principle of containment, where the transmitter is enclosed in a housing that is designed to contain, control, cool and then vent any possible explosion. This is accomplished by specially designed flanges, or more commonly, with threaded joints. The hot gases must travel a specific distance along the threads before they are cool enough to be safe. Care must be taken to avoid cross-threading the joints during assembly. In addition, heavy conduit and seal-offs are required to maintain an explosion-proof system. more
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Intrinsically safe transmitters, by their design, limit the thermal and electrical energy to a point where ignition is not possible. In contrast, explosion-proof transmitters work on the principle of containment, where the transmitter is enclosed in a housing that is designed to contain, control, cool and then vent any possible explosion. This is accomplished by specially designed flanges, or more commonly, with threaded joints. The hot gases must travel a specific distance along the threads before they are cool enough to be safe. Care must be taken to avoid cross-threading the joints during assembly. In addition, heavy conduit and seal-offs are required to maintain an explosion-proof system. more
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