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Issue/Rev. 0.1 (11/18) ║ MNKS025 • Page 13
From these equations one can isolate the gas flow velocity and VOS. Thus:
and
2.2.2.
Travel Time Corrections
The signal pulse in the transducers is converted from an electrical signal to an acous-
tic signal, and back to an electrical signal on the receiver side. The signal is delayed
during these conversions, and these transducer delays are measured for each trans-
ducer during internal testing. Typical magnitude of the transducer delays is 8-10µs.
2.2.3.
Calculate Average Gas Flow Velocity
To calculate the average gas flow velocity over the pipe area, information from all sound
paths, including transducer delays, are put into an integration formula.
Figure 9 shows a front view of the pipe, with the placement of the 8 sound paths in the
4 planes for the MPU 1600. The average velocity is given by:
∑
=
⋅
=
8
1
i
i
i
v
w
v
where wi is the weighting factors and vi is the average gas flow velocity for each path.
Similar equations are used for the MPU 800, MPU 600 and the MPU 200. Front view
of pipe, showing internal positions of the paths:
V
a
V
t
0
1
α
1
α
0
By checking the direction and magnitude of the transverse flow components in the two
upper planes, the flow regime can be determined, as shown in picture on next page.
MPU Series C I/O/M Manual
Product Overview
)
cos(
θ
v
c
L
T
d
+
=
)
cos(
θ
v
c
L
T
u
−
=
d
u
d
u
T
T
T
T
L
v
−
⋅
=
)
cos(
2
θ
d
u
d
u
T
T
T
T
L
c
+
⋅
=
2
)
cos(
θ
v
c
L
T
d
+
=
)
cos(
θ
v
c
L
T
u
−
=
d
u
d
u
T
T
T
T
L
v
−
⋅
=
)
cos(
2
θ
d
u
d
u
T
T
T
T
L
c
+
⋅
=
2
Содержание Smith Meter MPU 1600c
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