Page 50 SITRANS Probe LU (HART) – OPERATING INSTRUCTIONS A5E32337695
Parameters
Using Sound Velocity Calibration
Ensure a steady level at some low value (P653 and P654 adjusted accordingly).
1. Allow sufficient time for the vapor concentration to stabilize.
2. Press the measurement key to display the calculated reading.
3. Repeat step 2 at least five times to verify repeatability.
4. Measure the actual reading (use tape measure).
5. Enter the actual value.
6. Repeat this procedure if the atmosphere type, concentration, or temperature
conditions are different from when the last sound velocity calibration was
performed.
P652 Offset Correction
Stores the fixed offset value determined when an Offset Calibration is performed.
Alternatively, if the amount of Offset Correction required is known, enter the amount to be
added to the Reading before display.
P653 Velocity
Displays the value adjusted based on the Sound Velocity at 20
o
C (P654) versus
Temperature (P664) characteristics of air.
The units used depend on the setting for P005:
• m/s if P005 = 1, 2, or 3
• ft/s if P005 = 4 or 5.
Note: In gases other than air, the temperature variation may not correspond with the
speed of sound variation. Use P660 and P661 to select a temperature source, and use a
fixed temperature.
Values
Range –99999 to 99999
Related
• P650 Offset Calibration
Notes:
• P653 can only be accessed by entering the parameter number.
• The user cannot change the value of P653 directly, but can affect it via P654 or by
P660/P661.
Values (view only)
Range
50.01 to 2001 m/s (164.1 to 6563 ft/s)
Related
• P651 Sound Velocity Calibration
• P654 Sound Velocity at 20
o
C
• P660/P661 Temperature setting
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