RECOMMENDED SIEVE RE-CERTIFICATION SCHEDULE
- 5 inches to .25 inches 80 uses or 36 months
- US No. 1/2 to US No. 12 70 uses or 30 months
- US No. 14 to US No. 40 60 uses or 24 months
- US No. 45 to US No. 140 50 uses or 18 months
- US No. 170 to US No. 325 35 uses or 12 months
- US No. 400 to US No. 635 20 uses or 6 months
RECALIBRATING TEST SIEVES
Although a sieve may come from the factory with assurances of compliance, how long after use is it still considered calibrated?
Depends on use
- TYPE OF SIEVE SHAKER USED
(Many states now require laboratories to calibrate their sieves every 6 months to remain certified)
1) MICROSCOPY-Primary Method-Directly traceable. Use of a caliper to calibrate
all or a minimum of 30 apertures on a sieve is labor intensive
2) DEDICATED IMAGE ANALYSIS
Dedicated image analysis has made huge strides recently, due to software development.
NOTE: Recent innovations have brought this technology to the forefront. Costs have
been reduced and operational macros have virtually eliminated operator training
PRECISION SODA-LIME GLASS MICROSPHERES
are certified using electro-formed sieves, and measure the minimum
mean aperture size, (Dimension that retains spherical particles) They can only be used
once however, because some damage is presumed to occur during the calibration test.
4) PERFORMANCE TESTING USING A MASTER STACK OF SIEVES (ASTM E 2427) NEW IN 2006!
Calibration Sieves may be used as a master sieve stack, to compare results to a working stack of sieves,
using a representative sample.This can be a very cost effective method of calibrating working sieves.
Sample degradation can be a concern.
5 THIRD PARTY CERTIFICATION
Third party certification is always an option at a cost of about $90 to $150 per sieve, depending on the service required.
Available options are Sieve Inspection ASTM E-11 09, Sieve Certification ASTM E-11 04, Sieve Calibration ASTM E-11 09
WAYS TO EXTEND USABLE SIEVE LIFE
- Use an ultrasonic sieve cleaner
METHODS OF CALIBRATING SIEVES
"Without an active sieve re-certification program in place,
you're simply guessing."
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