Bio-Rad Econo Gradient Pump Kits - Manual (Page 11)

Front Panel Function
Purge Key
This key is used to prime and purge tubing
lines without disturbing the primary speed
setting of the pump. When Purge is pressed,
the pump will run at maximum speed (25
rpm), leaving the connected Gradient Mixer
and Aux valve operating and the fraction
collector and chart recorder off. The yellow
purge LED is illuminated when purging. This
key is not operable when the pump is
running in Program mode. Purge can be
stopped by pressing the Purge or Run keys.
Mode Key
Four different operation modes are
available: Remote, Setup, Manual, and
Program modes. These modes are
described in Section 6, System Operation.
Step Key and LEDs
Up to six program steps can be used. This
key selects the active step for programming.
The Step LEDs indicate which of the six
steps is active.
[Platen; see figure 3-1] Platen Screw
This is the screw on the pumphead
assembly. Proper adjustment of the platen
pressure increases flow stability, minimizes
flow pulsation, and prolongs the life of the
tubing. It should be adjusted 3-5 turns,
depending on tubing diameter. Refer to
section 4.3 for more details.
Description
7
Purge
Mode
Step
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