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4.3 Dispensing By Volume: Parameter Guide,
Magnetic Gear Pump: 201 Micropump Head
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 avoid overshooting of the
target volume. Thus a Slow Factor of 1.00 mL indicates that the last 1.0 mL will be dispensed at
reduced pump speed. Typically, for dispensed volumes less than 50 mL, the “Slow Factor” is
approximately 5% to 10% of the selected Dispensed Volume. Because of the check valve
installation, the “Sniffle” function is turned off i.e. Sniffle = 0.0.
Dispensed
Volume (mL)
Pump Head
Pump Speed
(Max. 3400 RPM)
Slow Factor
Tpical Precision
(RSD)
Dispensing Time
/ Alliquot (RSD)
10.00 mL #201 10% 1.50 mL 0.40% 3.0 sec
25.00 mL #201 15% 1.50 mL 0.20% 4.5 sec
50.00 mL #201 25% 2.00 mL 0.20% 4.5 sec
100.00 mL #201 40% 2.50 mL 0.12% 5.0 sec
200.00 mL #201 50% 3.00 mL 0.10% 8.0 sec
400.00 mL #201 75% 5.00 mL 0.05%
10.0 sec
1000.00 mL #201 100% 10.00 mL 0.05%
18.0 sec
Note: After changing pumping parameters, i.e. Pump Speed or Slow Factor settings, you
should re-calibrate the LabTec™ Dispenser (see Re-Cal feature) in order to maintain a high
accuracy / precision level.
Note: For each “Dispensed Volume”, ten (10) separate measurements were made; the average
“Dispensed Volume” the Standard Deviation and Relative Standard Deviation (RSD, %) as well as
the “Dispensing Time per Aliquot” were determined. Distilled water was used as a diluent, each
“Dispensed Volume” was verified by weight using a Mettler PG 5002-S , 0.01 gram resolution.
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