I
NSTALLATION
8
December 2000 Rosemount Analytical 748221-L
Model 7D Thermal Conductivity Analyzer
2.2.3 LEAK CHECK
Pressurize the system with air or inert gas such as nitrogen, making sure not to
exceed specified pressure limitation.
Liberally cover all fittings, seals and other possible sources of leakage with leak test
liquid such as SNOOP (PN 837801).
Bubbling or foaming indicates leakage, which MUST be corrected before introduction
of flammable-sample and/or application of electrical power.
2.2.4 GAS CONNECTIONS
The analyzer and gas selector panel modules must be interconnected according to the
flow diagram specified in the Data Sheet at the front of this manual. Gas fittings on
both modules are tagged as to use. Fittings are 1/4-inch NPT for 1/4-inch (6.3 mm)
tubing. For interconnection, use 1/4-inch (6.3 mm) copper or stainless steel tubing,
depending on whether the sample stream is corrosive.
C
ONNECTION OF
G
ASES
Refer to Figure 2-3 or 2-4 and drawing 654625. Connect sample/calibration gas lines
to fittings tagged “INLET” on bottom of analyzer. Connect appropriate vent line to
fitting labeled “OUTLET.”
Follow similar procedure for reference gas, if any.
F
IGURE
2-3. C
ONNECTION OF
A
NALYZER
U
SING
S
EALED
-I
N
R
EFERENCE
G
AS TO
A
SSOCIATED
G
AS
Zero
Standard
Gas
Span
Standard
Gas
Sample In
Needle
Valves
Flowmeter
Model 7D
Thermal Conductivity Analyzer
To Vent
Thermal Conductivity Cell
Reference Gas
Sealed-In
113357 or 113920
Gas Selector Panel
