SOS Comp
When
SOS Comp
is not checked, the flowmeter equation simply uses the soundspeed from the lookup table as:
C
fluid
= C
fluid from lookup table
When
SOS Comp
is checked, the flowmeter equation uses the soundspeed as measured from the signals:
C
fluid
=
L
fluid
t
fluid
Where
L
is the fluid length where the ultrasound travels, and:
t
fluid
=
t
signal
–2 * (
t
piezo
+
t
resdelay
+
t
transducer
+
t
pipe
+
t
liner
)
t
signal
=
t
peak
+
t
aperture start
–
t
signaloffset
–
t
daq
–
t
waveform
–
t
electronics
The following are constants for the hardware:
Electronics circuits:
t
daq
t
electronics
Transducers:
t
piezo
t
resdelay
t
transducer
Setup:
t
pipe
t
pipe
t
waveform
Cal->Transit-> SOS Offset:
t
signaloffset
Soundspeed Offset Button and Numeric Control
This button figures out
t
signaloffset
such that
C
fluid
=
Cfluid from lookup table
.
OTEE:
N
The
Soundspeed Offset
is only useful when
SOS Comp
is checked .
Cal (Calibration) Group
Page 71
November 2016
HYB-UM-00090-EN-04