Siemens sitrans LU01 - Manual (Page 92)

Page 86 SITRANS LU01 – INSTRUCTION MANUAL 7ML19985BE02
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Echo Processing Displays (Scope Displays, P810)
Dolphin Plus Display
Distance Calculation
To calculate the transducer to material level (object) distance, the transmission medium
(atmosphere) sound velocity (P653) is multiplied by the acoustic transmission to reception
time period. The result (round trip distance) is divided by 2.
Distance = Sound Velocity x Time
2
The Reading Value displayed is the result of performing any additional modification to the
calculated distance (Operation P001, Units P005, Volume Conversion, P050 to P054,
Reading Value, P060 to P063.)
Sound Velocity
The sound velocity of the transmission medium is affected by the type, temperature, and
vapour pressure of the gas or vapour present. As preset, the SITRANS LU01 assumes the
vessel atmosphere is air at 20°C (68°F). Unless altered, the sound velocity used for the
distance calculation is 344.1 m/s (1129 ft/s).
span + range extension
(P007) (P801)
TVT
Curve
display
echo progile
display
near blanking
(P800)
echo lock
window
display
echo
marker
display
Cursor
Echo Marker
TVT Curve
Echo Profile