Retsch PT 200 - Manual (Page 26)

Operating the machine
26
Fig. 6: Setting the opening width
The sub-sample is determined by the opening width of the sampling nozzle (PS) .
The maximum opening width(PS) in the standard bottom cone is 70 mm.
• Loosen the two knurled screws (SW).
• Set the opening width(X) by moving the slide (PW).
The scale on the bottom cone serves merely as an adjustment aid and does not
indicate the actual opening width(X).
The actual opening width(X) is measured in
the centre of the slot.
• Once you have set the opening width, tighten the knurled screws again.
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5.15 Calculating the slot width
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5.15.1 Sample nozzle – Opening width
The calculation of the opening width (x) depends on the feed quantity( QA ) and
the required fraction (QT) at a fixed pitch circumference ( UK ) of 795 mm.
Key to symbols
UK = fixed pitch circumference
QA = I nitial quantity
QT = Fraction
X = Slot width
Example :
QA = 0.200 kg
QT = 0.010 kg
UK = 795 mm
Formula:
PW
PS
SW
X