21
Pt. No. 67392
Issue 0918
Basic Calibration Procedure (Continued)
Use of Seed Rate Calculator
Determining the gear box scale setting using the calculator.
Usually the first calibration test yields a different seed rate. However with the value determined
from the first test it is possible to determine the correct gearbox setting with the aid of the
enclosed disc calculator. The disc calculator consists of 3 scales. An outer white scale (1) for
all seed rates above 30 kg/ha and an inner scale (2) for all seed rates below 30 kg/ha. On the
middle coloured scale (3) are all the gearbox setting numbers to a maximum value of 100.
Setting Example (Desired Seed Rate 125kg/ha)
1 From the calibration procedure at a gearbox lever setting of “70”, a seed rate of 175 kg/ha
is obtained.
2 Turn the inner disc until the measured seed rate of 175kg/ha (A) is in line with the related
actual gearbox setting of “70”(B).
3 Read off from the disc rule the necessary gearbox setting for the required seed rate of
125kg/ha (C). In this example the correct setting is “50” (D).
4 To be on the safe side the new gearbox setting can be checked by another calibration test.
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