Instruction Manual
748441-D
April 2002
Rosemount Analytical Inc. A Division of Emerson Process Management
Installation 2-5
Model CAT100
a. Gas
Conditioning
If the CAT 100 is not supplied with the op-
tional Sample Handling Plate, care must
be taken to ensure that the sample gas is
properly conditioned for successful opera-
tion of the various detectors.
All gases must be supplied to the ana-
lyzer as conditioned gases! When the
system is used with corrosive gases, it
must be verified that there are no gas
components which may damage the gas
path components.
The gas conditioning must meet the fol-
lowing conditions:
•
Free of condensable constituents
•
Free of dust above 2
µ
m
•
Free of aggressive constituents
which may damage the gas
paths
•
Temperature and pressure in ac-
cordance with the specifications
When analyzing vapors, the dew point of
the sample gas must be at least 10
°
C be-
low the ambient temperature in order to
avoid the precipitation of condensate in
the gas paths.
An optional barometric pressure compen-
sation feature can be supplied for the
CAT 100. This requires a pressure sensor
with a range of 800 – 1,100 hPa. The
concentration values computer by the de-
tectors will then be corrected to eliminate
erroneous measurements due to changes
in barometric pressure.
The gas flow rate must be in the range of
0.2 l/min to a maximum of 1.5 l/min. A
constant flow rate of 1 l/min is recom-
mended.
NOTE
The maximum gas flow rate for para-
magnetic oxygen detectors is 1.0 l/min!
