Connecting Sample And Protective Gases - Emerson ROSEMOUNT MLT 2 Upgrade Manual

ATEX Instruction Manual
ETC01035
02/2008
2.4

Connecting Sample and Protective Gases

After having installed the instrument, connect
the sample gas and protective gas supply
lines according to fig. 2-4.
To ensure faultless operation the following
conditions apply:
•
For the pressurization system a mini-
mum protective gas pressure of 2000 bis
4000 hPa (2...4 bar) has to be provided at
the inlet of the gas inlet valve.
2.4.1 Instructions for Handling Flammable Gases
• It is prohibited to supply flammable gases
before the prepurge phase has elapsed.
• To avoid internal release of flammable gas
either
the pressurization system has to be
setup to set the internal pressure of the
enclosure to at minimum 50 Pa above
the containment system pressure(with
a differential pressure monitoring this
condition)
or
an infallible containment has to be used
(if available).
HAZARD BY FORMATION OF EXPLOSIVE ATMOSPHERE
The operator should take into account the possibility of air penetrating
the containment system through a leak and the formation of explosive
atmosphere. Additional safety measures may be required for safe
operation!
Emerson Process Management GmbH & Co. OHG
2.4 Connecting Sample and Protective Gases
MLT 2 / BINOS
•
The pressurization unit is shipped with
configured parameters: E.g. the minimum
internal overpressure for standard applica-
tions is set to 1 mbar. Reasonable chan-
ges (e.g. increasing values) are permitted,
considering the instructions given in the
pressurization instruction manual and the
data given on the analyzers nameplate
label!
The 50 Pa threshold is specified
by the applicable standards.
It is prohibited to setup lower
values!

100 F
2-7