Lentils – Chapter 18 | Official Grain Grading Guide

Determination of size (sizing)

On written request, processed lentils only, if size is determined to be large or small, then size becomes part of the grade name. If a sample does not meet the definition for large or small, it is graded without reference to size.


Wear gloves and a mask to handle any samples that you suspect may contain hazardous substances.

1. Set up the Carter dockage tester as follows:

Feed control #6
Air control Off
Riddle None
Top sieve No. 15 round-hole
Centre sieve No. 12 round-hole
Bottom sieve Blank tray
Sieve cleaner control Off

2. Using a Boerner-type divider, divide the cleaned sample to obtain a representative portion of 250 g.

3. Turn on the Carter dockage tester.

4. Pour the sample into the hopper.

5. After the sample has passed through the machine, turn off the dockage tester.

6. Weigh separately. The percentage by weight determines the size of the lentils in the sample.

If . . . Then the size is . . .
97% or more of the sample remains on top of a No. 15 round-hole sieve Large, for example, Lentils, No. 1 CAN Large
80% or more passes through the No. 12 round-hole sieve Small, for example, Lentils, No. 1 CAN Small
otherwise no size indicated Lentils, No. 1 CAN

Optional analysis

Where a shipper requests special cleaning of a carlot of grain at a terminal elevator, and the elevator manager agrees, dockage material will be analyzed for the presence of grain. The percentage and grade of any grain contained in the dockage will be reported.


  1. Analyze the official sample.
  2. Record the following on inspection records:
    • The percentage by gross weight to the nearest 0.1% and the grade of lentils.
    • The percentage by gross weight to the nearest 0.1% and the grade of grain separable from dockage.
    • The percentage of dockage.

95.0% Lentils, No. 1 CAN

4.0% Domestic Mustard Seed, No. 1 CAN Oriental

1.0% dockage