DIGISPENSE 3020 CONTROLLER MODULE
Page 3-10
7 April, 2011
IVEK Corp.
P03L011B
3.2.1 Dispense Mode
Dispense Mode is the typical operating mode to use when dispensing fixed amounts of fluids. The amount of fluid to
dispense is configured by the Dispense Volume parameter. The range of the Dispense Volume is dependent on the
pump size and Actuator Module, but is normally a minimum of 0.01% of the pump chamber volume up to a maximum
of the full chamber volume. The repeatability of the dispense volume is dependent on many factors including: tubing
setup, selected tip, fluid characteristics, Actuator Module and pump characteristics, and fluidic movement profile.
Parameters such as Dispense Rate, Drawback, Drawback Rate, Drawback Dwell, and Acceleration, provide
configuration of the fluidic movement profile to provide the flexibility to meet the needs of various applications.
If the Dispense Volume setting is less than a half chamber, then multiple dispenses may be initiated before requiring
a reload. A reload will be required as soon as the volume remaining in the pump chamber is less than the amount
required for the next dispense or the volume dispensed has reached the Load Threshold.
3.2.2 Meter Mode
Meter Mode allows for variable fluid movement. The beginning and ending of the fluid movement may be initiated by
either the front panel start-stop buttons, RS232 commands or Logic I/O signals. However, the most precise control of
the start and stop of metering is via the Logic I/O signals.
Once initiated, fluid will Meter until stopped. If Drawback is enabled, it will be performed upon the stopping of the
Dispense.
If the Metering is not stopped, and the end of the chamber is reached, the operation will terminate and drawback will
occur if enabled. This means that a metered dispense may only occur up to volumes of a pump chamber volume
minus the drawback volume.
If the Metering is stopped before the end of the chamber is reached, another operation may be initiated, as long as
the volume displaced has not reached the Load Threshold.
3.2.3 Prime Mode
Prime Mode is the most typically used Fluidic Setup Mode and is used to prime the fluidic tubing and components
from the reservoir through to the tip before Production Mode operation. Having Prime as a separate mode from
production permits selection of optimum values for priming, which may be different than optimum values for
production. It is also often used in the Reverse Direction to remove the fluid from the fluidic system after Production
Mode operations are completed.
The amount of fluid moved is configured by the Prime Volume parameter. The range of the Prime Volume is
dependent on the pump size and Actuator Module, but is typically 0.01% to 1000 times the pump chamber volume.
Once initiated, the Prime operation will move the desired amount of fluid through the system unless stopped early.
NOTE
It is recommended to perform a Dispense in the desired Production Mode after a Prime operation in order to
properly setup the fluid for repeatable dispenses.
3.2.4 Display
The display provides an operator interface to all operating parameters in the Controller Module. New values can be
entered and current values displayed for all the functions of the system. The current operating mode and system
status are shown on the display. The display contains multiple interface screens each providing information to the
operator.
The display shows system status, settings and general information. The display is divided into six fields as shown.
Following is a description of what will be displayed in each field.
