Siemens sitrans LU10 Instruction Manual page 54

P653 VELOCITY
View the current vessel atmosphere sound velocity.
This value is based on Velocity at 20°C (P654) for the current Temperature (P664),
based on the sound velocity vs. temperature characteristics of air.
When a Sound Velocity Calibration is performed, this value is automatically
adjusted as required to suit the current atmosphere type, concentration, and
temperature.
Alternatively, if the current sound velocity is known, enter the current sound
velocity. (Refer to
The units used are m/s if P005 = 1, 2, or 3 (ft/s if P005 = 4 or 5).
values: 50.01 to 2001 m/s (164.1 to 6563 ft/s)
P654 VELOCITY AT 20°C
View the current vessel atmosphere sound velocity normalized to 20°C (68°F).
This value is used to calculate Sound Velocity (P653), using Temperature (P664)
based on the sound velocity vs. temperature characteristics of air.
After a Sound Velocity Calibration, this value may be checked to verify whether
the vessel atmosphere is air (typically 344.1 m/s or 1129 ft/s).
Alternatively, if the vessel atmosphere sound velocity at 20°C (68°F) is known,
and the sound velocity vs. temperature characteristics are similar to that of air,
enter the sound velocity.
The units used are m/s if P005 = 1, 2, or 3 (or ft/s if P005 = 4 or 5).
values: 50.01 to 2001 m/s (164.1 to 6563 ft/s)
Page 50
Technical Reference
SITRANS LU10 – INSTRUCTION MANUAL
Sound Velocity).
7ML19985AN02