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5.0 Magnetic Gear Pump Head: Model 201
The LabTec™ with a Magnetic Gear Pump Head is recommended for large-volume dispensing
applications. Used mainly for dispensing clean organic solvents. This is not considered a sterile
pump head.
The Model 201 magnetic gear pump head is an external type gear pump, which produces a pulse-less
flow. The spur gears rotate and intermesh inside the pumping chamber, thereby creating a pressure
differential between the inlet and outlet of the pump.
The rotating gears of the magnetic gear pump head generate significant shear, thus shear-sensitive
solutions, i.e. enzyme or protein preps, should be dispensed with the peristaltic pump.
Only clean fluids, without particulates or abrasives should be dispensed with magnetic gear pump
heads. Any particulates or abrasives will rapidly wear down the rotating gears and will decrease
pumping capacity. A gear replacement kit for the 201 (P/N: 080-320) is available from Parker.
Magnetic de-coupling occurs when the torque limit of the driving magnet has been exceeded.
Once de-coupling occurs, the driving magnet (this is the magnet fastened to the motor shaft) turns by
itself while the driven magnet (inside the pump head) is motionless. The Magnets will automatically
re-align and re-couple when the motor stops.
Mag 122, 120, and 040 heads are also available if slower flow rates are required, the same comments
above apply.
Note: An in-line check valve (P/N: 400-530) must be installed on the discharge side of the pump
head in order to avoid back-siphoning of solution between dispensing cycles and avoid losing
prime by allowing the pump head to remain dry. Make sure that the dispensing tip is located
above the solution reservoir level.
Note: Dispensing liquids with a viscosity greater than 1000 centipoises should be avoided.
Such high viscosity can cause magnetic de-coupling of the pump head. Reduce the LabTec™
pump speed when dispensing fluids with viscosity greater than 300 centipoises.
Important: When your dispensing task is completed, flush distilled water or an appropriate
solvent through the pump head for approximately two (2) minutes or until the solution appears
clear. Do not leave the dispensing solution in the pump head overnight.
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