Bindicator SonoTracker Ultrasonic Liquid Level, Installation & Operation Manual, Page: 73 / 96

update the level measurement. The default for Std Dev Ratio is 3.0.
• Listen Deviation monitors the listen deviation value. The absolute value of each of 16 listen noise values are
subtracted from the mean value. The results of each subtraction are added together to calculate Listen deviation.
• Listen Average monitors the mean value of the listen deviation and is displayed in the current engineering
units. It is calculated by averaging 16 listen noise values.
• Tx Points provides 16 transmits and listens. This value can be modified. Consult factory.
75 WINDOW
Window sets the size of the window around the target. Only signals within the window are recognized as valid
targets, in order to minimize interference from external noise. The window is maintained around the target as the
target moves up and down (i.e., as the target moves, the center of the window moves with it). Window has two
submenus:
• Set establishes the value for the window size. Default is 0. When window is 0 the Window function is disabled.
• Lost Echo Timer sets the limit on timing if the target cannot be detected within the window.
- If the target reappears in the window within Lost Echo Timer, seconds the SonoTracker Series stops
timing and maintains the window around the new target.
- If the target does not reappear in the window within Lost Echo Timer seconds, the SonoTracker Series
qualifies the next target (after Lost Echo Timer seconds) as the valid target, even if it is outside the
window. The SonoTracker Series then sets the window up around the new target location.
The default for Lost Echo Timer is 60 seconds.
77 ECHO LOSS
Echo Loss is for the echo loss timer, which allows you to set the amount of time from when an echo loss is first
detected to when the SonoTracker Series responds to the echo loss. The echo loss timer allows the SonoTracker
Series to ignore momentary echo loss which may occur occasionally. Echo Loss has two submenus:
• Timer allows you to set the amount of time from when the echo loss is first detected to when it is
reported on the display (with an asterisk *), reported over any communications links, and causes fail-safe
conditions (Echo Loss Mode) to apply for setpoints and current outputs. The default is 60 seconds.
• Mode allows you to select the echo loss indication mode — Timed or Temporary. If Temporary is
selected, the display shows an exclamation point (!) every time an echo loss is detected, even if only
momentarily. If the echo loss continues for Timer, the exclamation point changes to an asterisk (*) and
communications links, setpoints, and current outputs are affected. If Timed is selected, the display gives
no indication of the echo loss until the echo loss continues for Timer. The default for Mode is Timed.
78 END RANGE
End Range allows you to increase the rate at which the system transmits signals for targets that are close to
the transducer. Each type of transducer has a prescribed rate at which it transmits signals, based on allowing
enough time for a return of signal from a target at the transducer’s maximum range. There are two choices for
End Range:
• MaxRange — the transducer waits the prescribed amount of time, as defined for that transducer and
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SON280020 Rev. C