APG IRU-9400 user manual - Manual (Page 24)

IRU Series
Rev. B1 3/10
24
Automation Products Group, Inc.
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NOTE: If the internal temperature compensation is enabled and the sensor is
exposed to direct sun light, the radiant heat can warm the sensor housing above
the ambient temperature, which can affect the internal temperature sensor and
cause overcompensation.
Maximum Distance: Sets the maximum distance, beginning from the
sensor face, to the point where the sensor will stop looking for target signals.
Target signals detected beyond the Maximum Distance value will be ignored by
the sensor. The software distance reading will display the Maximum Distance
value under loss of echo conditions (no targets detected).
View Noise Level (view only) : Displays the number of echoes being
detected by the sensor. Noise levels in excess of 30 are usually an indication of
the presence of a noise source, which may interfere with the sensor operation.
Reducing the sensitivity may help reduce the detected noise level.
Set Noise Threshold: Sets the threshold level for the noise filter. If the
noise level exceeds this threshold, the sensor will maintain the last reading
before the noise threshold was reached. The reading will be maintained until
the noise level drops below the threshold. Sources of noise are most often from
electric sources but can also be from acoustical sources, such as the release of
high pressure air near the sensor face.