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ABB PGC5000 Series gas chromatographs

Introduction

For a classified Ex zone 1 area, the rationale behind

this “Zone 2 by design” analyzer is that the analyzer

must remain safe when operated in an abnormal

condition. In the event of a fault, the PGC5000

provides continual protection:

• Should a failed component become ignition

capable, the pressurization system prevents the

components from being exposed to flammable

gases or vapors.

• Should a failed pressurization system expose the

internal components to flammable gases or

vapors, the analyzer’s alarm provision will alert the

user of the failure.

Neither of these single faults would present a

hazard to the potentially explosive atmosphere;

therefore, electrical power interlock is not required

for this type of pressurization protection. Enclosure

doors are not required to be interlocked so that the

electrical supply is disconnected automatically

when doors are opened. The requirement is simply

an alarm provision since there are no hazards inside

the enclosure when in normal operation.

The zone 1 certified PGC5000 analyzer offers simple

pressurization protection, commonly referred to as

Ex ‘py’ or “Y-purge”. This enclosure pressurizing

technique is made possible by ensuring that the

internal components within the analyzer are not

capable of causing an ignition in normal operation,

thus allowing for a reduction in classification within

the protected enclosures from zone 1 to zone 2.

PGC Certification

This simple pressurization technique for the

PGC5000 is considered an improvement to the

process gas chromatograph analyzer by allowing for

a continual operation without possible disruption

caused by interlocking the electrical power to the

pressurization system. When operated in a zone 1

area, the user of the PGC5000 analyzer is simply

responsible for:

• Operating the analyzer within the manufacturer’s

established parameters, as described in the

product manuals and the CE conformity

declaration’s special conditions for safe use

• Providing a reliable supply of protected air for the

enclosure purge and pressurization system

• Monitoring the alarm state of the pressurization

system in normal operation

• Responding to the alarm condition of the

pressurization system, which may require

restoring the supply of protected air or the

removal of electrical power and proper isolation

of remaining hazardous live circuits if the area is

potentially hazardous

ATEX Directive 2014/34/EU, annex II

The PGC5000 analyzer “must be so designed and

constructed as to prevent ignition sources arising,

even in the event of frequently occurring

disturbances or equipment operating faults, which

normally have to be taken into account”. The design

of the analyzer is capable of functioning within the

established operational parameters and of ensuring

a high level of protection necessary for the intended

classified Ex zone 1 area. The notified body LCIE

examined the internal components of the PGC5000

and approved the analyzer as Ex ‘py’ for a zone 1

area:

• The EC-type examination of the PGC5000 series

analyzer and the IEC Ex test report first evaluated

the internal components to Part 15 of the

harmonized conformity standard IEC60079 (Ex ‘n’)

as either being non-sparking, energy limited or

temperature limited to below the specified

temperature class (ref: certificates EC-type LCIE

09ATEX 1017X and IECEx LCI09.0010X).

• The EC-type examination of the PGC5000 series

analyzer and the IEC Ex test report then evaluated

the pressurization protection of the enclosure to

part 2 of the harmonized conformity standard

IEC60079 (Ex ‘p’) as being suitable for zone 1 area

without electrical power interlock to the

pressurization system (ref: certificates EU-type

LCIE 09ATEX 3006X and IECEx LCI09.0010X).

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