Emerson 755A - Manual (Page 30)

Instruction Manual
245364-V
May 2002
2-10 Installation Rosemount Analytical Inc. A Division of Emerson Process Management
Model 755A
f. Corrosive Gases
In applications where the sample stream
contains corrosive gases, a complete
drying of the sample is desirable, as most
of these gases are practically inert when
totally dry.
For corrosive applications, consult the
factory.
WARNING
RADIOACTIVE SAMPLE GASES
Radioactive sample gases require the
stainless steel tubing option.
2-7 LEAK TEST
WARNING
POSSIBLE EXPLOSION HAZARD
This analyzer is of the type capable of
analysis of sample gases which may be
flammable. If used for analysis of such
gases, the instrument must be either in an
explosion-proof enclosure suitable for the
gas, or, protected by a continuous dilution
purge system in accordance with Standard
ANSI/NFPA-496 (Chapter 8) or IEC
Publication 79-2-1983 (Section Three)
If explosive gases are introduced into this
analyzer, the sample containment system
must be carefully leak-checked upon
installation and before initial start-up,
during routine maintenance and any time
the integrity of the sample containment
system is broken, to ensure the system is
in leak-proof condition.
Internal leaks resulting from failure to
observe these precautions could result in
an explosion causing death, personal
injury and/or property damage.
Supply air or inert gas, such as nitrogen, at 10
psig (69 kPa) to analyzer via a flow indicator
with range of 0 to 250 cc/min. Set flow at 125
cc/min. Plug sample outlet. Flow reading
should drop to zero. If not, system is leaking.
Leaks must be corrected before introduction
of flammable sample and/or application of
electrical power. Liberally cover all fittings,
seals, and other possible sources of leakage
with a suitable leak test liquid such as
SNOOP (PN 837801). Bubbling or foaming
indicates leakage. Checking for bubbles will
locate most leaks but could miss some
because some are inaccessible to application
of SNOOP. For positive assurance that
system is leak-free, use the flow stoppage
test.