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Velocity
P860 Sound Velocity
This parameter allows for the velocity of sound to be changed according to
the atmosphere the transducer is operating in. By default the velocity is set
for sound travelling in air at an ambient temperature of 20 degrees
centigrade. Default = 342.72m/sec
The following parameter can be used to re-calibrate the Sound Velocity
(P860), when the acoustic beam from the transducer is travelling through
mediums other than air or when there are variations of temperature between
the transducer face and the material level.
To obtain best results calibration should be carried out when the level is as
near empty as possible and when any vapour present has stabilized.
P861 Cal.Dist 1
This parameter is used to re-calibrate the speed of sound for Xducer 1
With the material at a steady level, view the value of P861 or P862, which
will indicate the current distance as calculated by the FlowCERT LITE
with respect to the current Velocity P860. Physically measure the distance
from the face of the transducer to the surface of the material level and
enter this value, in Measurement Units P104 and P860 will be automatically
updated to compensate for any difference between the displayed and entered
values.
Stability Parameters
Damping
Damping is used to damp the display, to enable it to keep up with the
process but ignore minor surface fluctuations.
P870 Fill Damping
This parameter determines the maximum rate at which the unit will
respond to an increase in level. It should be set slightly higher than the
maximum vessel fill rate. Default = 10m/min
P871 Empty Damping
This parameter determines the maximum rate at which the unit will
respond to a decrease in level. It should be set slightly higher than the
maximum vessel empty rate. Default = 10m/min
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