YSI P 700 IQ Analyzer - Manual (Page 85)

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P 700 IQ
Fig. 5-14: Holding the lower part (finger points to tube openings)
13 Lift the new pump tube (PT) to find out its intrinsic bend. See
Fig. 5-15,  85.
Fig. 5-15: Intrinsic bend of the tube
14 Insert the new tube in the dent so that it touches the two rear rolls.
Hold the end of the tube with your thumb. See Fig. 5-16,  85.
Fig. 5-16: Inserting the tube in the dent
All tubes have an intrinsic bend. Always equip the pump in
agreement with the intrinsic bend of the tube.