
Sentinel™ User’s Manual
5
Chapter 1. Installation
1.5.3
Multi-Path Design
Multi-path ultrasonic flowmeters are designed with more than one pair of transducers to interrogate the flow field in
different locations and more accurately determine the actual flow rate. The Sentinel Measurement System uses two
measurement locations. Both measurement paths are located along a diameter of the meter body and tilted at an
angle. The two measurement paths are orthogonal to each other (see
).
1.5.4 Flow Profile
One of the main factors affecting an ultrasonic flow measurement is the flow profile. If the flow profile is known,
mathematical modeling of the flow and the relationships between the paths' raw data can be made. This justifies the
required use of a flow-conditioning device with this system. A simulation example of how the flow conditioner
reduces secondary flow is shown in
below. Maintaining a constant flow-profile shape across all flow
velocities, pipe sizes and upstream flow disturbances is difficult. For this reason, the factory has tested the Sentinel
under various conditions in an effort to determine its operational limits.
Figure 4: Using a Flow Conditioner to Influence Flow Profile
5 D
10 D
x
z
y
Vz
Vz
Vx, Vy
Strong Cross Flow
Cross Flow is Eliminated
Vx, Vy
0
Flow Conditioner
Regular
Velocity
Profile
Irregular
Velocity
Profile
Disturbance Element
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