WPI NANOLITER2020, Инструкция по эксплуатации

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14 World Precision Instruments
3. Press Enter to store the new value or press Back to return to the Configuration screen
without saving any changes.
TIP : If you enter an erroneous value, click Delete to clear it. Then, use the keypad to enter a
new value.
Defining Pump Parameters
The pump parameters define how the selected pump responds. These are set on the
Configuration screen for the selected pump.
1. To access the Configuration screen, select a pump by tapping on the display from the
Command screen. Then, click Configure for your selected pump. See “Accessing the
Configuration Screen” on page 12.
Fig. 23— The bottom left corner of the Configuration window shows pump parameters that may
be set.
2. Touch the control to select the Motor Drive . The control toggle between Smooth
and Max Load . In order to simplify and to guarantee that the desired rate is achieved,
the controller has two options to determine the amount of microstepping needed.
The actual microstepping ratio is dependent on the selected syringe and the desired
delivery rate.
Motor Drive lets you set the pump to deliver the aliquot volume using the minimum
number of microsteps or the maximum number of microsteps that are possible for
the selected delivery rate.
•
Smooth yields the smoothest delivery for the selected rate. It sets the pump to
deliver the desired rate with the maximum number of microsteps. Depending on
the rate and the syringe geometry, this ratio can change between 256 microsteps
per step to full stepping
• Max Load yields a more pulsatile flow with a better force delivery. It allows the
pump to deliver at the desired rate with the fewest number of microsteps per step.
Depending on the rate and the syringe geometry, this ratio can change from full
stepping to 256 microsteps per step.
Smooth Delivery Max Load
Smooth out undesirable pressure pulses
when injecting very small volumes or for
injections over extended periods of time.
This option is quieter and has reduced
vibration.
When undesirable pressure pulsations are
observed during injects at a low rate, use a
smooth delivery.
More forceful delivery, as much as 15–
30% increase over Smooth delivery.
Improved precision.