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

By Anonymous -

 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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