Bio-Rad BioLogic LP System - Manual (Page 31)

4.2 ADJUSTING THE PLATEN AND PLUMBING THE PERISTALTIC PUMP
The peristaltic pump requires the following tubing lengths:
• PharMed 179 ±1.5mm
• Silicone 171±1.5mm
Note: PharMed is preferred. (Tygon should not be used in the pump head because it fatigues
rapidly.) If you are not using pre-cut tubing, cut the tubing to the lengths indicated above.
1. Proper adjustment of platen pressure increases flow stability, minimizes flow pulsation, and prolongs the
life of the tubing. To adjust platen pressure, use the platen adjustment screw. First turn the platen
adjust screw counterclockwise until it stops. Then turn the screw clockwise according to the table
below:
Number of Turns
Tubing ID From Fully Open
0.8 mm (1/32”) 5
1.6 mm (1/16”) 4
3.2 mm (1/8”) 3
Note: Overtightening the platen reduces flow rate and shortens tubing life. A loose platen will cause the
flow rate to decrease as the backpressure increases.
Figure 13. Plumbing the BioLogic LP Controller’s Pump
24
System Plumbing
1
Alarm
2
3
4
5
6
7
8
0
9
C
.
PLATEN ADJUST
SCREW
LOCK-RING
TUBING
LUER FITTING
SEE DETAIL