Partial Bank Pumping; Operation; Relative Pulsation Rates - Cole-Parmer Masterflex L/S 07519-10 Manual De Operación

(5) Partial Bank Pumping

The Pump can be operated with either a partial or a full bank of Car-
tridges. There is an elastic, VITON
of the two metal rods of the pump (see Figure 8) that holds the Car-
tridges in place on the pump. These O-rings should be adjusted as
follows. If the pump is partially loaded with Cartridges, slide the
O-rings along the rods, up against the front of the outermost Car-
tridge, to keep it in place (note position A, for example, in Figure 8). If
the pump is fully loaded with Cartridges, slide the O-rings to the front
of the pump as far as possible (note position B in Figure 8). When
using speed-reduced models (07519-15, -25) and the pump is less
than half full of Cartridges, load the Cartridges into the front half of
the pump so that the O-rings can be utilized.
This section describes the procedures for obtaining the desired performance.

(1) Relative Pulsation Rates

The relative pulsation rate in the pump output is dependent on several factors, including number of rollers on the pump
rotor, cartridge size, and whether cartridges are paired.
Using the range of oscillation observed in a ball type flowmeter as a measure, approximate relative pulsation values for
any given tubing size and flow rate are shown in the following chart. The chart is based on using a three-roller
® ®
MASTERFLEX L/S pump as the benchmark with an arbitrary value of 10.
®
MASTERFLEX L/S
Pump Type
6-Roller
8-Roller
6-Roller Paired Cartridges
8-Roller Paired Cartridges
®
fluoroelastomer O-ring on each
®

OPERATION

Small
Cartridge
4
3
1.5
<1
8
FIGURE 8 O-RING POSITION
Large
Cartridge
4
—
>1
—