APG DCR-WEB user manual - Manual (Page 12)

DCR-WEB Rev. A3, 10/08
12
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Example: Ignoring Intermittent Noise
The transceiver in the DCR-WEB is tuned to detect sound waves within a
range. There are certain external sources of noise in that range that can affect
the proper operation of the sensor, high pressure air escaping is the most
common source. In order to have the sensor ignore this noise a filter has been
installed. It allows the operator to set a threshold of the number of target that
can be received. If the number of targets exceed that threshold the sensor will
hold the last reading until the number of targets detected moves below it.
Filtering
MODE VALUE DESCRIPTION
VIEW TAR 20
TARGETS 26
Example: Rapid Level Changes
If the DCR-WEB’s filtering is too slow the distance being monitored is
changing rapidly, the display will seem to jump between readings instead of
scrolling smoothly as the level changes. To make the detected distance follow
the target better the amount of filtering will have to be reduced.
MODE VALUE DESCRIPTION
SAMPLE 50
RATE
AVERAGE 5
OUT- 24
RANGE
SAMP
View the number of targets that are detected when the
material that is to be monitored is at the closest acceptable
point to the sensor. If the number of target is higher than
75 it may be advisable to reduce sensitivity.
Set the number of targets slightly higher than the reading
obtained above so that the sensor will not be affected by
external sources of 50khz noise.
Set the sampling interval to a shorter time requirement.
This will provide more reading in a given period of time
to the sensor.
The number of samples averaged can be reduced
providing less of a lag in updating the sensor.
Increasing the filter window for good readings. This will
increase the update time but decrease the filtering of
unwanted echoes.