Kenco Engineering SmartSonic Transmitter (Integral) - Manual (Page 20)

Page 20
For Example:
Displays the current distance/level mode
setting
and
Used to cycle between Distance (d000) and
Level (L000)
Select the desired response mode.
Returns to Pr.08
Atmosphere Compensation
The Pr.09 program enables you to compensate for speed of sound changes in different atmospheres, for example, 100%
methane instead of air. See Appendix A for a list of Gasses and their compensation factors.
To calculate the Gas compensation factor divide the sound velocity of the actual atmosphere by 343 m/sec (sound
velocity in air). For example, if your vessel’s atmosphere is 100% Methane (CH
4
), the factor is:
Therefore, 1.29 should be entered to compensate for Methane.
If the Gas cannot be found in Appendix A., or if the atmosphere is not a pure gas, there is another process to follow.
Measure the distance from the transducer to the fluid level, and by trial and error, try to enter different compensation
factors, until the transmitter reads the measured level. This method will be accurate as long as the atmosphere does not
change.
Press / Action Display Description
and simultaneously
Enter the Program Menu
Eight Times
Cycle to Program #9
Default Screen (while entering program)
Default Value
and
For Example:
Enter the calculated factor, or measure the tank
and estimate a factor. This example shows the
factor for ethanol
Select the desired response mode.
Returns to Pr.09
29 . 1
sec / 343
sec / 82 . 445
=
m
m