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APG IRU-9400 user manual User Manual

Page 22

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IRU Series

Rev. B1 3/10

22

Automation Products Group, Inc.

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Average:

Defines the number of target samples (readings) that will be

averaged together to become the distance reading. Each qualified sample (see

Window and Out of Range Samples below) is placed into a first-in, first-out

(FIFO) buffer and averaged with previous samples to generate a steady output.

The higher the number of samples averaged, the greater the smoothing effect of

the readings. A higher Average setting will result in slower response to rapid

changes in the target distance.

Window:

Sets the radius of the target acceptance window. The target

acceptance window is a zone extending along the sensing plane in both

directions starting from the target distance. The Window parameter determines

the length that the window extends in each direction. For example, if the

sensor is detecting a target at 5 ft. and the Window is set at 1 ft., then any target

detected between 4 ft. and 6 ft. will be accepted. Any target detected within

the Window will be considered legitimate and figured into the averaging buffer.

Any target detected outside of the Window will considered “out of range” and

will be ignored based on the setting in the Out of Range Samples parameter (see

below).

Out of Range Samples:

Determines the number of consecutive target

samples that occur outside of the acceptance window before the “out of range”

target is recognized as a legitimate target. Suppose the Out Of Range Samples

is set to 10. If a target is suddenly detected outside of the acceptance window, it

will be ignored until it has been detected for 10 consecutive samples, at which

point it will be qualified as a legitimate target. If the “out of range” target was

detected for only 9 consecutive samples before moving out of the sensing area,

it would never be acknowledged as a target and the reading would stay with the

last qualified target sample. The combination of the Window and Out of Range

Samples parameters allow the sensors to be used in applications where undesired

targets, such as agitator blades, intermittently enter the sensing area. These filter

parameters are also helpful for qualifying legitimate targets while ignoring errant

echoes that might occur in the application.

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