16
Compensation Menu Options
19) Detection Threshold Voltage
This option determines detectable size of return echo. This is useful when the first return echo is
needed in condition where small objects creating various kinds of return echoes exist. In case the set
value is high, it can be stronger to the noise, but may not be able to detect small echoes. The 4 is equal
to 0.3V. The table below shows the equivalent voltage to each value
No.
4 5 6 7 8 9 10 11 12 13 14 15
Voltage
0.3 0.5 0.7 0.9 1.1 1.3 1.5 1.7 1.9 2.1 2.3 2.5
20) Detection Method
This option determines detecting algorithm.
If “ FIRST ECHO” is set, it will detect the first returned echo.
If “ MAXIMUM ECHO” is set, it will detect the maximum echo among the returned echoes.
However, this method is used on the condition that the difference in voltage between the maximum
echo and other echoes should be less than 0.5V. This method is useful where smaller objects are near
the target.
21) 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 sound traveling in air at a temperature of 0
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.
DETECTION THRESHOLD
LEV : 4
DETECTION METHOD
METHOD : FIRST ECHO
SOUND VELOCITY SET
VELO : 331.5m/s
