Instruction Manual
748441-D
April 2002
Rosemount Analytical Inc. A Division of Emerson Process Management
Installation 2-11
Model CAT100
2-3 ANALYTICAL LEAK CHECK
If explosive or hazardous gas samples are be-
ing measured with the CAT 100, it is recom-
mended that gas line fittings and components
be thoroughly leak-checked prior to initial ap-
plication of electrical power, bimonthly inter-
vals thereafter, and after any maintenance
which involves breaking the integrity of the
sample containment system.
a. Flow
Indicator
Method
Supply air or inert gas such as nitrogen,
at 10 psig (689 mbar), to the analyzer
through a flow indicator with a range of 0
to 250 cc/min. Install a shut-off valve at
the sample gas outlet. Set the flow rate to
125 cc/min (ml/min).
Close the outlet shut-off valve and notice
that the flow reading drops to zero. If the
flow reading does not drop to zero, the
system is leaking and must be corrected
before the introduction of any flammable
sample gas or application of power.
Figure 2-5. Leak check - Flow Indicator Method
Flow Meter
N
2
10 psig
(690mbar)
Gas Outlet
CAT 100 Analyzer
Inlet Outlet
