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2.2 Weight Ratio Dispensing: Parameter Guide,
Magnetic Gear Pump:
The following information should be used as a general guide in selecting optimal dispensing
parameters. This data was collected with a 3400-RPM LabTec™ Dispenser mounted with a
201 Micropump Head. A check valve (P/N: 400-530) was used as a dispensing spout.
The “Slow Factor” is implemented at the end of each dispensing cycle to allow the electronic scale
to stabilize. Thus a Slow Factor of 25 mL indicates that the last 25 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” function is turned off i.e. Sniffle = 0.0
Edit Parameters: All dispensing was done with a 201 Micropump Head.
EDIT 1: Wgt Factor = 9.00, Sniffle = 0.0, Slow Factor = 25.00 gr, Pump Rate = 50%,
Time Delay = 00:00, Count = 1
EDIT 2: Wgt Factor = 99.00, Sniffle = 0.0, Slow Factor = 25.00 gr, Pump Rate = 50%,
Time Delay = 00:00, Count = 1
EDIT 3: Wgt Factor = 6.79, Sniffle = 0.0, Slow Factor = 25.00 gr, Pump Rate = 50%,
Time Delay = 00:00, Count = 1
Sample Theoretical Ave. Delivered Dispensing Time
Weight
Diluent Weight Diluent Weight
RSD (%)
per Aliquot
EXEC 1: Wgt. Factor = 9.00
10.00 gr 90.00 gr 89.93 gr 0.11% 8 sec
20.00 gr 180.00 gr 179.98 gr 0.11% 12 sec
EXEC 2: Wgt. Factor = 99.00
1.00 gr 99.00 gr 98.70 gr 0.40% 8 sec
2.00 gr 198.00 gr 197.50 gr 0.35% 12 sec
EXEC 3: Wgt. Factor = 6.79
26.00 gr 176.54 gr 176.52 gr 0.07% 10 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: Weights were used as surrogate samples. Weight sizes: 1.00 gr, 2.00 gr, 10.00 gr and 20.00
gr were placed on PGS Mettler scale. Distilled water was used as a diluent; fi e (5) separate
measurements were made for each of the four (4) sample weights, their average Delivered Diluent
Weight and the Relative Standard Deviation (RSD) are summarized above.
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