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Meter installation in a vented gas applicationFigure 1-7:
STATUS
SCROLL SELECT
A
B
D
F
A
E
C
G
H
GDM
GDM
I
A. Meter isolation valves
B. Flowmeter
C. Venting valve
D. Flow control needle valve
E. Filter
F. Pressure regulator
G. Thermal insulation
H. Vent/vacuum test point
I. Low-pressure vent system connection point
Note
Do not insulate the transmitter (electronics) and maintain a nominal 1-in clearance between the insulation and the transmitter
housing.
1.6.3 Meter installation in an ultrasonic meter application
To use the GDM with a full-bore ultrasonic meter, Micro Motion recommends that you
install a Rosemount Annubar
®
flowmeter downstream from the ultrasonic meter as a
means to provide differential pressure.
The following diagram shows a Rosemount Annubar meter installed to provide differential
pressure for the measurement system. This type of installation method does not require
sample gas to be vented to atmosphere. The Annubar and GDM must be installed a
specific distance downstream from the ultrasonic meter in your pipeline. Refer to all
manufacturer guidelines for best practices or recommendations for installing the meters in
your system.
Planning
12 Micro Motion
®
Gas Density Meters