You should take a look at purging systems:
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If explosion proof enclosures or intrinsic safety barriers do not provide enough protection
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If explosion proof enclosures or IS barriers are too expensive to use on your project
Intrinsic Safety Barriers are often used in intrinsically safe applications. Intrinsic Safety Barriers limit the current and voltage conducted through a device's power or signal wiring. This limitation prevents shorting and arcing of the wires or device, thus preventing ignition of the surrounding atmosphere. Intrinsic Safety Barriers are commonly used for protection of instrumentation that operates at extremely low power levels, and are suitable for exposure to the environment.
Advantages of intrinsic safety barriers:
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The Only Protection Allowed for Zone 0
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Eliminates Possibility of Explosion
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No Hot Permits
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Low Maintenance
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No Special Cables
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Ideal for Low-Power Devices
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Limits Energy to the Device
Disadvantages of intrinsic safety barriers:
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Requires Documentation of I.S. Circuits and Installation
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Can be Used Only With Low-Power Devices
Pepperl+Fuchs BebcoEPS Purge/ Pressurization units are designed to supply one or more protected enclosures with a clean instrument air or inert gas. This process removes flammable gases or prevents the accumulation of ignitable dusts within the protected enclosure(s).
This method of protection is not limited by the quantity, configuration, power requirements, or location of the protected equipment.
These systems are commonly used for all applications involving basic electronics, electrical equipment, motors and switchgear. BebcoEPS products meet the demands of rack-mounted instrumentation, video displays, programmable controllers, computers, printers, recorders, measurement, gas analyzers and calibration equipment.
One of the best benefits is the continuous flow of protective gas, which can be specifically used to eliminate problems like heat increase, moisture buildup, dust and corrosion.
Advantages of purge/pressurization units:
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Reduces Heat Build up
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Inhibits Metal Corrosion
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Low Maintenance
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Increases Equipment Longevity
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No Special Enclosures Required
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Allows Fast Access to Equipment
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Reduces Moisture & Dust Build up
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Reduces Classification Within the Enclosure
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Continuous System Status Indication
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Protects Enclosures up to 450 ft3
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Allows use of any Enclosure Shape
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Cost of Protection per ft3 Decreases With Enclosure Size
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No immediate danger if system failure occurs
Disadvantages of purge/pressurization units:
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Contains Moving Parts
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Requires Instrument Air Supply
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Some Systems Require Electronics
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Hot Permits Required
Need more help? Not a problem! In-house technical support is always available. Marshall Wolf Automation is your authorized industrial automation distributor for the complete line of Pepperl+Fuchs!