ULTRA 3 INSTRUCTION MANUAL
156
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 (at 1bar, atmospheric pressure). Default = 342.72 m/sec.
P861 Cal. Dist 1
When Ultra Wizard = 1 Level/Volume
This 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.
With the material at a steady level, view the value of P861, which will
indicate the current distance as calculated by Ultra 3 with respect to the
current value of 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.
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