Model   Nominal   Nominal Divisions   Discrete             Foot
     Name    Capacity  Ratio  Percentage   Portions             Notes
 
     MSR       25 mL   20:1       5           20                 1, 2
 
     SR1A      1   L   16:1      6.25         16                 1
     SR1B      1   L   16:1      6.25          6                 1, 2
     SR1AB     1   L   16:1      6.25     up to 6, or all 16     1, 2
 
     SR5B      5   L   16:1      6.25          2                 1, 2
     SR5B4     5   L   16:1      6.25          4                 1, 2
 
     SR10A     10  L   20:1       5           20
     SR10A--B  10  L   20:1       5            4
       combined with    5:1      20            4
 
     SR40B     40  L    8:1      12.5          8
     SR40AB    40  L   40:1       2.5       See note three

Note 1

These instruments have a common drive unit and frame.  Only the hopper and sample collection facilities differ, which are interchangeable from the MSR to the SR5B4 inclusive.

Note 2

By omitting a collection vessel one less discrete sample will be collected, with the proportion collected as the bulk sample increasing correspondingly.

Note 3

For the SR40AB, two of the nominal five litre samples may be collected as splits of one plus four, or of two plus three.  It follows that a sample, nominally of any number of fortieths of the original volume, may be derived with a suitable arrangement of collectors.