P854 Fixed Temperature
This parameter sets the temperature, in degrees centigrade to be used if
P852 (Temperature Source) =3. Default = 20
o
C
P860 Sound Velocity
This option 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
342.72m/sec which is the speed of sound travelling in air at a temperature of
20
o
C.
The table below gives details of the velocity of sound in various gaseous
atmospheres In all cases the velocity indicated is that in a 100% gaseous
atmosphere at 0
o
C. In atmospheres less than 100% it may be necessary to
check the level indicated at near empty and near full and compare with the
actual level, several times, then adjust the Sound Velocity accordingly to
obtain an accurately displayed reading.
P645 Vapour Temperature Compensation
The sound velocity in air increases or decreases at a uniform rate of
60cm/sec. per
o
C, however in atmospheres other than air it will change at a
different rate.
This option allows the rate of change in cm/sec. per
o
C to be set according to
the atmosphere and temperature present. The level indicated, should be
compared with the actual level, several times, then Vapour Temperature
Compensation adjusted accordingly, to obtain an accurately displayed
reading. Default = 60 cm/sec. per
o
C
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