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Emerson Process Management Manufacturing GmbH & Co. OHG
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ATEX Instruction Manual
HAS8xE-IM-ATEX
January 2004
1-3-5 Sample Gas Conditions
Applicable gases: Nonflammable gases or
gas mixtures which always Flammable gases
remain below LEL
Maximum sample
gas pressure: atmospheric or atmospheric or
<1500 hPa at normal <1500 hPa at normal
atmospheric pressure, atmospheric pressure,
dependend on gas dependend on gas
measuring principle measuring principle
and
overpressure < 13 mbar
against surrounding atmosphere
Sample gas flow: for all sample gases refer to the corresponding analyzer data sheet
1-3-5 Sample Gas Conditions
1-3-6 Differential Pressure Monitoring
For analyzers connected to flammable gases (either sample gas or span gas) the operator
needs to ensure that the pressure within the containment system always remains at minimum
50 Pa below the pressure within the analyzer enclosure. This ensures that in case of a leak the
flammable gas does not enter the enclosure.
An additional differential pressure switch is provided to monitor the pressure difference:
In case the pressure difference decreases below 50 Pa the contact opens.
It is the user’s responsiblity how to use the signal within his system:
The limit of 50 Pa is the least permissible value given by the standards, higher values are
acceptable, too.
Flame arrestors are required for gas inlets and outlets.
Electrical and mechanical connections are shown in section 2 „Installation“.