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