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P1-P860, P2-P1860 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/water at an ambient temperature of 20 degrees centigrade.
Default = 342.72m/s (velocity in air for dB transducer)
Default = 1482.32m/s (velocity in water for VT transducer)
Stability Parameters
Point 1 / Point 2
Damping
Damping is used to damp the display, to enable it to keep up with the process but
ignore minor surface fluctuations.
P1-P870, P2-P1870 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
P1-P871, P2-P1871 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
Filters
The following two parameters can be used to filter out unwanted changes of level
caused by a ‘rippled’ or agitated surface.
P1-P881, P2-P1881 Fixed Distance
This parameter determines the width of gate to be used in tracking an echo and
under normal circumstances will not require changing, but it can be increased in
the cases where the surface is moving extremely fast (in excess of 10m/min) to
ensure smooth processing of the changing level.
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