Chemical Engineering January 2017 - 39

Process Measurement and Control Systems:
Airborne Contaminants. Copper and silver
sensors are exposed to the environment for
a period of time and quantitatively analyzed
to determine corrosion-film thickness and
chemistry. Silver-reactivity monitoring must
now be used as part of an assessment in
order to provide a complete accounting of
the types of corrosive chemical species
present in the local environment and to establish
environmental severity levels.
ISA 71.04 classifies four levels (Class G1,
G2, H3 and GX) of environmental severity for
electrical and electronic systems providing a
measure of the corrosion potential of an environment
(Table 1). The overall classification
is based on the higher of the total copper
and silver reactivity rates.
Corrosion monitoring. CCCs can be
placed throughout the control room to determine
compliance with air-quality specifications.
Realtime ACMs are used in the
controlled environment and on or in server
cabinets to provide realtime data on corrosion
rates and the effectiveness of corrosion
control strategies. Proper assessment will
require monitoring of the outdoor (ambient)
air and at various locations inside and outside
the control center. Either monitoring
technique may be used to provide the data
necessary to troubleshoot and mitigate contamination
issues inside the control center.
There are many options that can be considered
with respect to air-quality monitoring
for industrial control-room applications,
and there should be some consideration
for room size and layout to determine the
minimum number of CCCs and ACMs and
their locations, to provide a statistically valid
environmental assessment.
There is general confidence in being able
to identify contaminant types, for instance
active sulfur, sulfur oxides and inorganic
chloride compounds, when using corrosion
monitoring. This carries more weight from a
scientific standpoint in that it can be verified
using independent sources of environmental
data, such as air-pollution indices or satellite
data, to verify the results obtained from
corrosion monitoring.
CCCs are typically used for an initial survey
of ambient air quality and the environment
in which electronic equipment is located,
and can be used on a continuing basis to
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Chemical Engineering January 2017

Table of Contents for the Digital Edition of Chemical Engineering January 2017
