22
Program Editing and Execution
At this point, you need to consider the parameters of the dispensing that you are going to do. The
following is a list of the various parameters available, and their defaults. Adjust these parameters
based on the weight that you are dispensing. Consult Part C, Section 5.0, of the LabTec™ Manual to
edit your weight dispensing parameters.
DISP. WEIGHT: Defines the weight to be dispensed in grams. For example, if you want to dispense
50.00 grams, use the “Incr” and “Decr” keys to scroll to 50.00 and press “Select”. (The default
Disp. Weght = 100.00 gm).
SNIFFLE: The sniffle function consists of a brief pump reversal at the end of the dispensing cycle to
suck in the droplet that typically hangs at the end of the dispensing tip if a filter is used by reducing
the back pressure. Select Sniffle = 0.0 (Adjust as needed if a filter is used).
SLOW FACTOR: Defines the solution weight that is dispensed slowly at the end of the dispensing
cycle to allow for stabilization of the scale. This should be 10-15% of the total weight if the aliquot
is less than 50 gm. For aliquots larger than 50 gm, the default of 25 gm will usually work well. This
can be adjusted based on the pump rate and the tubing size to avoid overshooting the target weight.
(The default Slow Factor = 25 gm).
DIRECTION: Defines the rotation of the pump head, this parameter can be changed from clockwise
(CW) to counter clock-wise (CCW). (Default = CW).
PUMP RATE: Defines the relative pump speed (0% to 100%) with which the solution is being
dispensed. The default Pump Rate = 80%. This may be adjusted as needed. Slower pump rates
may be desirable to increase accuracy and minimize back splashing.
TIME DELAY: Defines the time interval, in seconds, between dispensing cycles. (Default = 00.01).
COUNT: Defines how often the dispensing cycle will be repeated. For example, when COUNT = 10,
then the selected Dispense Weight will be dispensed 10 times. (Default = 1).
1. For this example, set a dispense weight of 200.00 gm. From the Mode Select screen, use “A”
or “B” to go up or down to the “Weight” mode, and Press “C” to select it. The Weight mode will
give you the following display:
- WEIGHT DISPENSE -
Exec
Edit Prime
A B C
2 . Press “C” momentarily to prime the tubing and remove all the air from the system. Then press
“B” to enter the Edit Menu, and “C” to select “Edit 1”.
Up
- E D I T 1 -
Down
Select
A B C
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