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DIGISPENSE 3020 CONTROLLER MODULE
Page 3-68
7 April, 2011
IVEK Corp.
P03L011B
Drawback Screen Description -
The Drawback screen displays the current Drawback parameters and allows a
user with Supervisor permission to change the parameters. The current permission level determines which push-
buttons are available as shown. Refer to section 3.1.9 for description of Drawback.
The Start push-button is not functional, but the Stop push-button is functional while this screen is visible.
Status -
The status indicates the operational state of the system. Refer to section 3.3.9 for an explanation of each
status type.
Drawback Volume -
The Drawback Volume is the amount of liquid drawn back during a drawback cycle. The range
is based on the pump size as shown in the Pump Minimum/Maximum Chart. The increment is equal to the minimum
volume for the selected pump size. Drawback volume is limited to the full chamber volume minus dispense volume.
A drawback volume of zero disables drawback while a drawback volume greater than zero enables drawback.
NOTE
It is reset to 0 when the dispense volume is increased such that the dispense volume plus drawback volume
exceeds the full chamber volume.
Drawback Rate -
The Drawback Rate is the rate of the pump in micro liters per second during a drawback operation.
The range is based on the pump size as shown in the Pump Minimum/Maximum Chart. The increment is equal to the
20% of the minimum rate.
Drawback Dwell -
The Drawback Dwell is the time between the end of a dispense and the beginning of the
drawback cycle in seconds. The range is 0.00 sec to 2.55 sec with an increment value of 0.01. The recommend
minimum is 0.05.
To change a value;
1. Press the Arrow push-buttons to highlight the parameter.
2. Press the Enter push-button to bring up either the Select New Value or Enter New Value screen.
3. In the Select New Value screen use the up and down arrow push-buttons to select the value. In the Enter New
Value screen press the Minimum or Maximum push-buttons to select the desired value or use the left and right
arrow push-buttons to select the digit and the up and down arrow push-buttons to change the digit's value.
4. Press the Enter push-button.
Drawback Minimum/Maximum Chart
Pump Minimum Maximum Minimum Maximum
Size
Volume
Volume
Rate
Rate
µl
µl
µl/Sec
µl/Sec
4A
0.0
< 20
0.010
40
3A
0.0
< 50
0.025
100
2A
0.0
< 100
0.05
200
1A
0.0
< 200
0.10
400
B
0.0
< 400
0.20
800
C
0.0
< 1000
0.50
2000
D
0.0
< 2000
1.00
4000