Select Pump Speed; Adjust Occlusion Settings On Cartridges - Masterflex L/S 07519-05 Notice D'utilisation

(2) Select Pump Speed

Select fixed speed drive or adjust speed of variable speed drive to pro-
vide desired nominal flow rate within the rpm speed range shown for the
pump model selected.

(3) Adjust Occlusion Settings on Cartridges

CAUTION: Excessive occlusion can cause high pump tempera-
tures and early tubing and roller failure. Do not set
occlusion tighter than what is recommended in
Table 4.
NOTE: With large and small Cartridges, the scale provides nominal oc-
clusion for MASTERFLEX
With a multi-channel Cartridge system, flow rate, pressure sensitivity
and tubing life can be fine-tuned—even while the pump is running. No
lost time, and with operating speeds up to 600 rpm, you get higher max-
imum flows with the same size tubing.
Figure 8 (large and small Cartridge) shows the wedges adjusted at #3
on the occlusion setpoint scale for the MASTERFLEX tubing.
The Occlusion Adjustment Knob (see Figure 8) controls a screw mechanism to move the occlusion wedges. Once a
Cartridge is adjusted to a desired setting for a particular application, there is no need to reset. Or, you can record settings
and quickly reproduce them at a later time.
(a) Normal Occlusion Settings
The following table shows the appropriate occlusion settings to provide satisfactory performance for various tubing
sizes. (For optimum occlusion settings, see following section.)
Microbore Tubing Set
MASTERFLEX
(b) Occlusion Setting Procedure:
1. Select the recommended occlusion value from the table.
2. Turn the Occlusion Adjustment Knob to align the inside edge of the white Wedge with the scale number. (Clockwise
rotation increases the occlusion.)
(c) Optimized Occlusion Settings
Some applications require additional fine-tuning of the occlusion setting to vary the flow rate for a particular tubing, to
reduce flow variations caused by changes in system pressure, or to increase tubing life.
1. Adjust the Occlusion Wedges as described in the preceding table.
2. Refine this setting, depending on your objectives:
NOTE: To Maximize Tubing Life
While running the pump, simply reduce the adjusted occlusion setting by turning the Occlusion Adjustment Knob coun-
terclockwise to move the wedges to a higher setpoint scale number (toward 5). Continue turning the knob counterclock-
wise until the flow drop-off or the pressure sensitivity becomes unacceptable, then turn knob slightly clockwise.
NOTE: To Reduce or Eliminate Flow Drop-Off Rate with Pressure Fluctuations
While running the pump alternate the backpressure between the expected high and low values and increase the
adjusted occlusion setting. Turn the Occlusion Adjustment Knob clockwise to move the wedges to a lower setpoint scale
number (toward 1) until the flow drop-off is minimized.
NOTE: To Fine-Adjust the Flow Rate
Increase or decrease the occlusion value to vary the flow.
® ®
L/S precision tubing at the #3–#4 setting.
TABLE 4 RECOMMENDED OCCLUSION SETTINGS
Tubing
® ®
L/S Precision
FIGURE 8 OCCLUSION INDICATIONS
Large Cartridge Scale
N/A
#3 – #4
9
Small Cartridge Scale
#1 – #2
#3 – #4