Specifications

INSTALLATION
3.3.5 Analytical Leak Check
If explosive or hazardous gas samples are being measured with the µCEM, it is
recommended that gas line fittings and components be thoroughly leak-checked prior
to initial application of electrical power, and at bimonthly intervals thereafter, as well as
after any maintenance which involves breaking the integrity of the sample containment
system.
3.3.5.1 Flow Indicator Method
Figure 3-8. Leak Test Flow Method
Supply air or inert gas such as nitrogen, at 10 psig (689 hPa), 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.
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.
3.3.5.2 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 approximately 50 hPa. The water column will be about 500 mm.
Flow
Meter
N
2
10 psig
(69 kPa)
Rosemount Analytical µCEM Continuous Analyzer Transmitter 3–1
Gas
Outlet