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GUIDE TO EX NA INSTRUMENTATION INSTALLATION
29 October 2012
In a new 26 page Application Guide AG310 from BEKA, hazardous area equipment guru Chris Towle explains the philosophy of Zone 2 apparatus and how extra low voltage Ex nA certified instrumentation may be safely installed in these low risk areas.
Current ATEX and IECEx standards are discussed, together with installation practice, constructional requirements, documentation and routine inspection.
Of particular interest is the use of Ex nA certified apparatus with instruments using other protection techniques. Chris shows how an Ex nA loop powered indicator in Zone 2 may be used to monitor the output from a Zone 1 Ex d transmitter, simplifying installation and reducing cost.
The guide can be downloaded at www.beka.co.uk/ag310.pdf