CALIBRATING TEST SIEVES
             RECOMMENDED SIEVE RE-CERTIFICATION SCHEDULE

            Aperture                                                       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

(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 
               See Automatic Sieve Calibrator
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.
These glass microspheres calibrate close to 80% of the sieving medium
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
METHODS OF CALIBRATING SIEVES
Caliper
CALIBRATION BEADS
CALIBRATION SIEVES
SIEVE CALIBRATION SERVICE
SIEVE INSPECTION SERVICE
SIEVE CERTIFICATION SERVICE
"Without an active sieve re-certification program in place,
you're simply guessing."  
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​3) CALIBRATION STANDARDS

  WIDE DISTRIBUTION CRUSHED QUARTZ 

  Irregular shape of crushed quartz powder leads to confusion in exact  
  parameter required to pass sieve apertures.