Owner manual

IM 11Y01B02-11E-A 3rd Edition :August 14, 2012-00

3-4 3-5<3 INSTALLATION AND WIRING>

3.4 Purge Gas Requirements and Hazardous Area Systems

TheTDLS220Analyzerrequiresacontinuousnitrogen(optionallyinstrumentair)gaspurgetopreventambient

oxygeningresstotheopticalpath,whenoxygenisthemeasuredgas.Theowratecanbeminimizedaslong

asitpreventsanyambientoxygeningresstothemeasurementopticalpath.Otherpurgegasesmaybeusedas

long as they do not contain any of the measured gas and a clean, dry, etc.

For hazardous area operation, the same nitrogen purge gas is used to purge the entire analyzer (including non-

optical path sections such as the electronics). Refer to purge diagrams below.

Insomeapplications,InstrumentAir(I/A)maybeusedasthepurgegas.Specialsoftwarecongurationsmust

beset-upunderthe“Congure”sectioncalled“Non-ProcessParameters”–refertosoftwaresectionofthis

manual for further details.

Theowratecanbeminimizedaslongasitpreventsanyambientoxygeningresstothemeasurementoptical

path.Otherpurgegasesmaybeusedaslongastheydonotcontainanyof

ELECTRONICS

CONTROLLER

FLOW CELL

POWER

HEAT

TRACE

LASER &

DETECT

N2 Purge Inlet

N2 Purge Vent

Figure3–SafeArea/GeneralPurposeN2AnalyzerPurgeSchematic