A5E32337695 SITRANS Probe LU (HART) – OPERATING INSTRUCTIONS Page 51
Parameters
P654 Sound Velocity at 20
o
C
This value is used to automatically calculate Sound Velocity (P653).
After performing a sound Velocity Calibration, check this value to verify the acoustic
beam atmosphere in air (344.1 m/s or 1129 ft/s).
Temperature Compensation (P660 to P664)
P660 Temperature source
Determines the source of the temperature reading used for calculating speed of sound.
P661 Temperature fixed
Defines the fixed temperature (in
o
C) used for calculating speed of sound if P660 is set to
2 (fixed temperature).
Use this function when you want to manually override the temperature sensor with a
fixed temperature value.
• Set P660 to 2.
• Enter the fixed temperature value you want to use in place of the sensor
temperature.
Values
Range
50.01 to 2001 m/s (164.1 to 6563 ft/s)
Related
•P005 Units
• P651 Sound Velocity Calibration
• P653 Velocity
Values
1* Transducer (P664)
2
Fixed temperature (P661)
Note: Maximum Temperature (P300) always uses the transducer as source: it is not
affected by P660.
Values
Range
–40 to 85
o
C
Default
20
(
o
C)
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