Instruction manual

P - 2
NGA 2000 MLT Hardware
PREFACE
Emerson Process Management GmbH & Co. OHG
Instruction Manual
90002929
12/2006
b) Analyzer versions - Installation in Hazardous Areas
Note!
This manual does not deal with special conditions for analyzers in hazardous areas, related to
installation, operation, maintenance etc. For such applications refer to the separate instruc-
tion manuals, delivered together with the analyzers. For installation in hazardous areas the
MLT 2 can be equipped with the appropriate pressurization system acc. to the actual required
explosion protection measures.
Solutions acc. to CENELEC (according to former European EN 50016) use combinations of MLT
2 and an appropriate pressurization system being individually certified (see separate manual
about pressurization system and individual certification report - §10 Elex).
In this case a magnetically operated touch panel or an intrinsically safe front panel (combined with
approved PCB EXI 01for Zone 1, option for Zone 2) is implemented and MLT 2 is combined with
a simplified pressurization for European Ex Zone 2 or with an approved pressurization system for
European Ex Zone 1 (see separate instruction manual).
Additionally the MLT 2 may be equipped with intrinsically safe I/O's (see separate instruction
manual )
MLT 2-NF is a special analyzer version of MLT 2 with Z Purge system for North American Class
1 Zone 2 measurements of non-flammable gases in hazardous areas (CSA-C/US type approved
for Zone 2, see separate instruction manual).
EEx p solutions acc. to ATEX (European Directive for Equipment to be used in Explosive
Atmospheres; mandatory since July 1, 2003) use type approved combinations of MLT 2 and
appropriate pressurization systems (see separate ATEX instruction manual about pressurization
system and certification). The separate ATEX manual covers all EExp Ex Zone 1 solutions as well
as solutions for Ex Zone 2 measuring non-flammable gases. Solutions for measuring
flammable gases in Ex Zone 1 or 2 are described in a separate instruction manual.
For installation acc. to ATEX in Ex Zone 1 and 2 the MLT 2 is always equipped with a
magnetically operated touch panel (see separate manual too). Additionally the MLT 2 may be
equipped with intrinsically safe I/O's (see separate instruction manual).
The CAT 200 analyzer or analyzer module is designed to be installed in hazardous areas, too,
It is consisting of a 1/2-19" MLT 1 analyzer (analyzer module) installed into a flameproof Ex d
enclosure with Ex em junction box. This model is CSA-C/US and ATEX approved for
installation in North-American and European hazardous areas (Ex zone 1).