In an agricultural application, the fastest method of testing to determine the effectiveness of a gravity is through the use of a U.S. Standard Weight Per Bushel Tester. These can be purchased through your local Oliver representative or the difference in weight between the heavy and light product. The Gravity should be set to obtain the maximum weight difference between the light and heavy products.
The test weight of the heavy, middle and light fractions should be recorded along with the machine setting necessary to obtain this. For seed applications, germination and vigor testing should be done on these fractions and the results recorded with the test weights. This gives a written record, for future reference, of the operation of the Gravity Separator and the settings necessary to obtain a separation of that product. Included is a sample form for recording the necessary information.