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centerline
system
CENTERLINE® Sieve Certification
Accuracy and reliability are two requirements
every Advantech customer not only needs, but requires
and deserves. That’s why we took on the task of
pioneering and producing sophisticated optical technology
to assure the level of quality of the wire cloth used
in our testing sieves.
 With
the CENTERLINE Sieve Certification
program, we’re able to provide the actual opening
and wire diameter data from your sieve — as well
as verification of compliance with applicable standards
— at or near the center of the allowable ASTM
specification range.
We can calibrate new or used sieves from our own stock
and other sources, with typical processing time of three
to five days.
How It Works
The basis of the analyzer is an optical system,
a high resolution video camera, image acquisition hardware
and the software to integrate the entire process. Once
the image to be measured is captured, the signal sent
to the computer by the camera is described in terms
of pixels (which become the common denominator upon
which all measurement values are based). The system
is calibrated to assign a measurement value (resolution)
to each pixel measured, and the number of pixels measured
is multiplied by the calibration value to obtain the
linear measurement value reported.
A stage micrometer (a glass slide with precision-ruled
lines on one surface) is used to set the calibration
values in the system. Our stage micrometer was sent
directly to the National Institute of Standards and
Technology (NIST) where each ruling was measured and
verified to six decimal places (that is 0.000001 mm)
with a helium-neon laser interferometer, and is now
the basis of our NIST traceability system.
Secondary standards were established based on this
stage micrometer to allow for daily, documented calibration
of the entire system designed to verify not only the
performance of the image analysis system, but to identify
operator-to-operator variations as well.
Once the data is acquired by the image analysis unit,
it’s transferred to a set of algorithms to perform
over twenty sets of specific calculations. Pass/Fail
evaluations are conducted. Also, a histogram of the
opening measurements is provided. A hard copy report
is generated, a traceable serial number is affixed to
the sieve and the original data set is archived both
electronically and on hard copy for future reference.
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