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Continuous Dilution Purge Gas Inlet: Continuous dilution is a method of maintaining pressure in an electronics enclosure in which
after the electronics enclosure has been diluted below the required lower explosive limit (LEL) the protective gas is passed
continuously through the electronics enclosure at a pressure above that of the required 0.20 inches H2O (0.50 mbar) and discharged
to the outside atmosphere through an exhaust vent. The same volume of purge gas is maintained during and after the dilution time cycle.
Continuous dilution is normally used for maintaining and controlling heat buildup from the electronics within the pressurized enclosure by
continuously exchanging purge gas through the electronics enclosure to atmosphere.
Leakage Compensation Purge Gas Inlet:
Leakage compensation allows a higher volume of protective gas supply to be manually or automatically selected
to speed up dilution time of potentially flammable materials to an acceptable level, permitting a more-rapid application of initial power, or
restoration of power to protected electrical equipment, after service. When the dilution cycle has elapsed, the large volume of purge gas can
be manually or automatically turned off, which allows a volume of purge gas larger than the leak rate of the electronics enclosure to be introduced
into the now protected electronics enclosure to maintain at least 0.20 inches H2O (0.50 mbar). Leakage compensation is normally used to conserve
purge gas when utilities are at a premium.
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