Operation and Maintenance
UFM Series 6
Q.Sonic-plus
nnn
n
raw
tbatab
L
VoG
n
11
cos2
be shorter, while the upstream ones “t
ba
“ will be longer as compared when
the gas is not moving. The equation below illustrates the computation:
where:
t
abn
the downstream travel time of path n.
t
ban
the upstream travel time of path n.
L
n
the straight line length of the acoustic path between
the two transducers.
VoGraw is the average uncorrected (raw) gas velocity.
n
the angle between the gas flow and ultrasonic signal.
The raw gas velocity is corrected by a Reynolds flow profile correction. This
correction is depending on the path type. Also the contribution of the gas
velocity of each path to the combined gas velocity is depending on the path
type.
4.2 Correction after Calibration
After flow calibration the meter can be adjusted either through an adjust
factor or through linearization. How the meter is adjusted can be visualized
at the display. Please see Chapter 7.1 LED at Display (p.33).
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