Heidolph Pump Heads - Manual (Page 53)

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53
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Fold tube over rotor, depress latch (refer to fig. 35) until pawl snaps in (refer to fig. 36).
Note: as required, depress tube cassette at place marked in fig. 36, to ease snap action.
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Adjust tube contact pressure. Turn knob (59) until inside edge of wedge is centered between
#1 and #2 marks on the data plate graduation (refer to fig. 32).
5.1.1. How to optimize contact pressure setting
For certain applications, contact pressure needs re-adjustment . For example, varying feed rate of
a particular tube, minimizing feed rate fluctuations caused by changes in system pressure, or to
simply extension.
5.1.1.1. For maximum of tube life
With the pump running, decrease tube contact pressure adjusted before. To this end turn
regulating knob (59, fig. 32) counterclockwise to displace wedges to a higher scale reading
(towards 5). Go ahead turning knob (59, fig. 32) until feed rate or pressure are too low. From this
point go ahead turning knob clockwise until feed rate and pressure are ok.
5.1.2. Pump operation with partial use of a multi-channel pump head (fig. 37)
Pump may be run with all or part of the multi-channel pump head's ports connected. Both metal
rods of the pump feature an elastic packing (60) on both ends that secures cassettes on the pump.
Secure multi-channel pump heads with part of the ports loaded with cassettes by slipping packings
(60) over the rods towards the front end of the outboard cassette (refer to e.g. position A). On
fig. 35
fig. 36
DEPRESS TO
EASE SNAP-ON
AND OFF
fig. 37
60
60
O-RING
(PREFORMED
PACKING)
POSITION B
(COMPLETELY
LOADED)
POSITION A
(PARTLY LOADED