Milltronics airanger XPL plus, Instruction Manual, Page: 53 / 114

7ML19981AN02 AiRanger XPL Plus – INSTRUCTION MANUAL Page 49
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P651 SOUND VELOCITY CALIBRATION
Use this feature if:
a) The vessel atmosphere is other than air.
b) The vessel atmosphere temperature is unknown and a temperature sensing
device is not used.
c) The Reading accuracy is acceptable at higher material levels only.
To perform a Sound Velocity Calibration:
With the material at a low steady level perform the following steps.
1. Allow sufficient time for the vapour concentration to stabilize.
2. Press
to display the calculated distance*.
3. Repeat step 2 at least 5 times to overcome Echo Lock (P721) and verify
repeatability.
4. Measure the actual distance* (e.g. with a tape measure).
5. Enter the actual value. (Velocity parameters P653 and P654 are adjusted
accordingly).
Repeat this procedure if the vessel atmosphere type, concentration, or
temperature varies from that present when the last sound velocity
calibration was performed.
values: -999 to 9999
* When Operation (P001) for the Point Number displayed is set for:
a) "level", the distance is from Empty (P006) to the material / object surface.
b) "space" or "tripper", the distance is from Span (P007) to the material / object
surface.
c) "distance", the distance is from the transducer face to the material / object
surface.
P652 OFFSET CORRECTION
View the amount of offset applied to the Reading.
This value is automatically adjusted when an Offset Calibration is performed.
Alternatively, if the amount of Offset Correction required is known (and
performing an Offset Calibration is not desired), enter the amount to be added to
the Reading before display.
values: -999 to 9999