Instruction Manual
748441-D
April 2002
2-12 Installation
Rosemount Analytical Inc. A Division of Emerson Process Management
Model CAT100
b. Manometer
Method
Install a water-filled U-tube manometer at
the sample gas outlet. Install a shut-off
valve at the sample gas inlet. Admit air or
inert gas to the inlet shut-off valve until
the analyzer is pressurized to approxi-
mately 50 hPa. The water column will be
about 500 mm.
Close the inlet shut-off valve and, follow-
ing a brief period for pressure equilibrium,
verify that the height of the water column
does not drop over a period of about 5
minutes. If the water column height drops,
the system is leaking and must be cor-
rected before the introduction of any
flammable sample gas or application of
power.
Figure 2-6. Leak Check - Manometer Method
NOTE:
Refer to Section 1-4 Specifications
(page 1-11) for maximum pressure
limitations.
For differential measurement, the leak
check must be performed for the
measurement and reference side sepa-
rately.
For analyzers with parallel gas paths,
the leak check must be performed for
each gas path separately.
Water
N
2
Overpressure
Approx. 50 hPa
CAT 100 Analyzer
Inlet Outlet
