GE PanaFlow MV80, Руководство пользователя

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Chapter 1. Introduction
6 PanaFlow™ MV80 & MV82 User’s Manual
1.6 Flowmeter Configurations
PanaFlow Vortex Mass Flowmeters are available in two model configurations:
•
Series MV80 in-line flowmeter (replaces a section of the pipeline)
•
Series MV82 insertion flowmeter (requires a “cold” tap or a “hot” tap into an existing pipeline)
Both the in-line and insertion configurations are similar in that they both use identical electronics and have similar
sensor heads. Besides installation differences, the main difference between an in-line flowmeter and an insertion
flowmeter is their method of measurement.
For an in-line vortex flowmeter, the shedder bar is located across the entire diameter of the flow body. Thus, the entire
pipeline flow is included in the vortex formation and measurement. The sensing head, which directly measures
velocity, temperature and pressure is located just downstream of the shedder bar.
Insertion vortex flowmeters have a shedder bar located across the diameter of a short tube. The velocity, temperature
and pressure sensor are located within this tube just downstream of a built-in shedder bar. This entire assembly is called
the insertion sensing head. It fits through any entry port with a 1.875 inch minimum internal diameter.
The sensing head of an insertion vortex flowmeter directly monitors the velocity at a point in the cross-sectional area of
a pipe, duct, or stack (referred to as “channels”). The velocity at a point in the pipe varies as a function of the Reynolds
number. The insertion vortex flowmeter computes the Reynolds number and then computes the total flow rate in the
channel. The output signal of insertion meters is the total flow rate in the channel. The accuracy of the total flow rate
computation depends on adherence to the piping installation requirements given in
Chapter 2 . If adherence to those
guidelines cannot be met, contact GE for specific installation advice.
1.6.1 Multivariable Options
The MV80 or MV82 models are available with the following options:
•
V = volumetric flowmeter
•
VT = velocity and temperature sensors
•
VTP
= velocity, temperature, and pressure sensors
•
VT-EM
= energy output options
•
VTP-EM
= energy options with pressure
•
VT-EP = external pressure transmitter input.