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Judul : Best Practice for the Selection of Types of Protection in Hazardous Areas For Process Instruments
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Best Practice for the Selection of Types of Protection in Hazardous Areas For Process Instruments

 All installed process instruments in hazardous areas are required to have a type of protection that ensures safety of personnel as well as that of the instruments.

The following table provides the guidelines to select the type of protection according to the zone of risk:

Type of Protection	Meaning
Ex i	Intrinsic Safety
Ex d	Flameproof Enclosure
Ex e	Increased Safety
Ex m	Encapsulation
Ex p	Pressurized Apparatus

Device	Zone 0	Zone 1	Zone 2
Transmitter/Positioner	Ex i	Ex i (preferred) Ex d (alternative)	Ex i (preferred) Ex d, Ex e, Ex m (alternatives)
Switch/Push-Button	-	Ex de	Ex i (preferred) Ex e, Ex m (alternatives)
Temperature Sensor	-	Ex e	Ex e
Solenoid Valve	-	Ex d	Ex d
Junction Box	-	Ex e	Ex e
Fire & Gas Detector	-	Ex d	Ex d
Analyzer	-	Ex I, Ex d	Ex i, Ex d
Local Panel	-	Ex d or Ex p	Ex d or Ex p

Note: As the Directive ATEX 94/9/EC is mandatory, only “Ex” equipment CE marked compliant with this ATEX Directive may be installed within the European Union.

Instruments will typically be designed to have immunity for radio frequency and electromagnetic interferences.

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