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Atrato_Instruction_Manual_0322
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4.5.3. Special Options: Limit Gain
The Atrato has an internal automatic gain
control which will boost or reduce the
ultrasonic signal if required. As standard,
this gain control is limited to 2 levels to
prevent the meter attempting to measure
background noise. Without this the
software can boost the noise in the body
and focus at the wrong time location for the
ultrasonic signal in the liquid.
If the liquid has a very low signal due to its
acoustic properties, the operator can
configure with this limit removed.
WARNING:
If the flow meter is powered and the flow tube is only part full or empty, removing
the Limit Gain check may cause the meter measurement point to move far from the actual
area it should be. This will cause erroneous flow readings for some or all of the measurement
period. A power cycle will set the meter back to its calibration focus point.
4.5.4. Speed of Sound Compensation/Signal Strength
The Atrato ultrasonic flowmeter is factory
calibrated on clean water and therefore the
window of calibration is based around the
measured time of flight of the ultrasonic
signal based on the speed of sound of water.
The graphic should show a large green signal centrally in the window, such as above.
A red graphic indicates a very poor signal, orange indicates a weak signal. This could be
due to the acoustic properties of the fluid or insufficient back pressure on the flow meter.
The Atrato flowmeter has an automatic gain which will increase in order to find a signal. The
more this is increased above calibration, the weaker the signal is in the liquid.
Very Poor /weak Signal
Poor/weak Signal
