The New Porton NG-12 Graticule

Particle Sizing and Distributing

The use of the eyepiece graticules shown in this section makes it possible to analyze specimens containing particles as an alternative, or in addition to, sieving. Graticules for particle size analysis are particularly popular when there are only limited quantities of particles or where particles are smaller than 50 microns in diameter. Typical substances analyzed are sand grains, soil particles, plant seeds, fertilizers, abrasives, liquid droplets, pigments, pulverized coal, silica, fibers, and fine dust.

The basic principle employed is to compare particles to the globes and circles of varying sizes that appear on the graticule – dark particles being compared to solids globes, and light or transparent ones to the circles. Naturally the procedure varies with the graticule concerned, more information about which is given below.

Please note that for calibration, the circles and globes will represent particles smaller in diameter by the magnification of the objective.

New Porton - NG12

The NG12 is particularly useful since the array of globes and circles are conveniently close to where the particles pass. At the end of each band of the sample the mechanical stage is traversed vertically to take in the next band until the whole sample has been covered.

Pattern Description Dia Cat #
NG12 Modified Porton pattern globes/circles.
Surface chrome image.
16 mm 68032-16
19 mm 68032-19
21 mm 68032-21
Cat # Description Pack Price Quote Quantity
Cat #: 68032-16 Description: NG12 New Porton Graticule, 16mm Pack: Each Price: $248.00 Add to Quote:
Cat #: 68032-19 Description: NG12 New Porton Graticule, 19mm Pack: Each Price: $248.00 Add to Quote:
Cat #: 68032-21 Description: NG12 New Porton Graticule, 21mm Pack: Each Price: $248.00 Add to Quote: