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MLT 2 / BINOS
®
100 F
ATEX Instruction Manual
ETC01035
August 2005
Emerson Process Management Manufacturing GmbH & Co. OHG2 - 6
2-4 Connection of Sample Gas and
Protective Gas (Purge Gas)
When the analyzer with assembled EEx p
safety device has been fixed, connect the
gas lines according the diagram (fig. 2-3).
The following conditions must be observed
for trouble free operation:
• The operator must ensure the minimum
pressure of the protective gas at the
point of installation.
A pressure of 2,000 ... 4,000 hPa
(2...4 bar) must be applied to the
protective gas inlet of the EEx p safety
device.
2-4 Connection of Sample Gas and Protective Gas (Purge Gas)
• The EEx safety device is delivered with
fixed basic parameters. The minimum
purge gas pressure is preset to 1 mbar
for standard applications. Useful
modifications such as increasing the
max. purge gas pressure must only be
done after studying the appropriate
sections of the manual of the EEx p
safety device.
• Flammable sample gas must not be
supplied to the analyzer until the pre-
purging phase has ended.
2-4-1 Hints on Flammable Gases
• When applying flammable gases (either
as sample gas or span gas) the
corresponding gas inlets and outlets
must be equipped with flame arrestors.
• To avoid internal release of flammable
gases the minimum pressure specified
for the pressurized enclosure is at least
50 Pa higher than the maximum
pressure specified for the containment
system. A differential pressure switch is
provided with the system to operate if
the pressure difference falls below
50 Pa.
• For Category 2 equipment the switch
is connected to the pressurization
system to disconnect the complete unit
from power in case of a failure (refer
to circuit diagrams in the appendix).
The 50 Pa limit is the value
defined by the associated
standards. It is not allowed
to decrease this value but
higher values are allowed .
Category 3 equipment:
The purpose(s) for which the differential pressure switch is used (i.e. to
disconnect power or to sound an alarm or otherwise maintain the safety of
the installation) is the responsibility of the user!