Siemens sitrans LU01 - Manual (Page 61)

7ML19985BE02 SITRANS LU01 – INSTRUCTION MANUAL Page 55
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Before using this feature, verify the following parameters are correct:
• Empty (P006)
• Temperature (P664)
• Offset Reading (P062)
Offset Calibration
Begin with a steady level.
1. Press TRANSDUCER to display the calculated reading.
2. Repeat Step One at least five times to verify repeatability.
3. Measure the actual reading (use tape measure).
4. Enter the actual value.
The deviation between the entered Empty (P006) value and the calibrated Empty value is
stored in Offset Correction (P652).
P651 Sound Velocity Calibration
Changes the speed of sound constant.
Condition for use of this feature
• The acoustic beam atmosphere is other than air
• The acoustic beam atmosphere temperature is unknown
• The Reading accuracy is acceptable at higher material levels only
For best results, calibrate with the level at a known value near empty.
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 TRANSDUCER to display the calculated reading.
3. Repeat Step Two at least five times to verify repeatability.
4. Measure the actual reading (e.g. with a tape measure).
5. Enter the actual value.
Repeat this procedure if the atmosphere type, concentration, or temperature conditions
are different from when the last sound velocity calibration was performed.
Values Range: -999 to 9999
Related
• P653 Velocity
• P654 Velocity at 20°C
Note: In gasses other than air, the temperature variation may not correspond
with the speed of sound variation. Turn off temperature sensor and use a fixed
temperature.