Emerson NGA 2000 TO2 - Manual (Page 21)

Instruction Manual
760008-A
September 2001
Rosemount Analytical Inc. A Division of Emerson Process Management Installation 2-3
Model NGA 2000 TO2
a. Leak Test
The TO2 Analyzer Module is completely
tested at the factory for gas leakage. The
user is responsible for testing for leakage
only at the inlet and outlet fittings on the
rear panel.
CAUTION .
SENSOR DAMAGE
Do not expose the Sensor to pressure in
excess of 1.0 psig as this may cause dam-
age.
Flow Indicator Method
Supply air or inert gas such as nitrogen,
at 1 psig (6.8 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 sample gas or
the application of power.
2-6 ELECTRICAL CONNECTIONS
WARNING .
ELECTRICAL SHOCK HAZARD
Operate this equipment only when
covers are secured. Servicing re-
quires access to live parts which can
cause death or serious injury. Refer
servicing to qualified personnel. For
safety and proper performance, this
module must be connected to a
properly grounded three-wire source
of electrical power.
Electrical connections must be made
in compliance with National Electri-
cal Code (ANSI/NFPA 70) and/or any
applicable national or electrical
codes.
Two electrical connections are required on the
Analyzer Module: POWER and NETWORK
(See Figure 2-4). On the Analyzer Module,
two NETWORK connectors are available, ei-
ther of which is appropriate for: 1) intercon-
nection with the Backplane of the Platform or
2) "daisy-chaining" with other NGA 2000
components (A star connection is acceptable
for LON lengths under about 10 meters.)
Connect a source of 24 V 5A DC power to the
power inlet. Make sure that the ground con-
nection is made, and that this is separate from
the power return lead. Failure to ensure a
good ground may result in random noise and
disturbance in the analyzer readings.