6
5.2
Dispensing By Weight: Parameter Guide,
1082; Silicone: 15 & 24
The following information should be used as a general guide in selecting optimal dispensing
parameters: This data was collected with a 600 RPM LabTec™ Dispenser mounted with a
1082 pump head; the “Tube Size” parameter refers to thick walled Silicone pump tubing sizes: 15 &
24.
The “Slow Factor” is implemented at the end of each dispensing cycle to allow the electronic scale to
stabilize. Thus a Slow Factor of 20.00 mL indicates that the last 20 mL will be dispensed at reduced
pump speed.
The end of the dispensing cycle will be indicated by a “beep” followed by the display “Dispensing
Completed”. The “Sniffle”,i. e. momentary pump reversal at the end of the dispensing cycle, is set at
its default value of 0.3.
Edit Parameters: All dispensing was done with #15 and #24 Silicone pump tubing
EDIT 1: #24 Pump Tubing: Disp. Weight = 200.00 gr, Sniffle = 0.3, Slow Factor = 20.00 gr,
Pump Rate = 80%, Time Delay = 00:01, Count = 5
EDIT 2: #15 Pump Tubing: Disp. Weight = 50.00 gr, Sniffle = 0.3, Slow Factor = 14.00 gr,
Pump Rate = 80%, Time Delay = 00:01, Count = 5
Weight
Ave. Dispensed Dispensing Time
Set
Weight
RSD (%)
per Aliquot
#24 Silicone Pump Tubing
200.00 gr 199.95 gr 0.03% 16 sec
150.00 gr 150.00 gr 0.11% 14 sec
100.00 gr 100.01 gr 0.11% 13 sec
50.00 gr 49.96 gr 0.18% 12 sec
25.00 gr 25.05 gr 0.25% 10 sec
#15 Silicone Pump Tubing
50.00 gr 50.03 gr 0.10% 13 sec
25.00 gr 25.06 gr 0.22% 12 sec
15.00 gr 15.04 gr 0.60% 12 sec
10.00 gr 10.02 gr 0.65% 12 sec
Note: The LabTec™ will stop pumping just prior to reaching the target weight; once the scale has
stabilized, the LabTec™ will complete the dispensing cycle.
Note: Distilled water was used as a diluent; five (5) separate measurements were made for each
of the sample weights. Each aliquot was weighed on a PGS Mettler scale, readability 0.01 gr.
The average Delivered Diluent Weight and the Relative Standard Deviation (RSD) are
summarized above.
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