Ismatec: Pump Technologies
| Advantages & Limitations |
Peristaltic Pumps
|
Gear Pumps
|
Rotary Piston Pumps
|
|---|---|---|---|
| Max. flow rate |
13,000 ml/min
(higher possible) |
12,000 ml/min
(higher possible) |
2,300 ml/min
|
| Min. flow rate |
< 0.001 ml/min
|
1 ml/min
|
0.025 ml/min
|
| Drive speed (max) |
500 rpm
(Flowmaster) |
6,000 rpm
(MCP-Z) |
1,800 rpm
(MCP-CPF) |
| Drive speed (min) |
Depends on drive
|
60 rpm
(MCP-Z) |
10 rpm
(MCP-CPF) |
| Max. differential pressure |
2.5 bar (36 psi)
PTFE tubing: 6.9 bar (100 psi) |
5.2 bar (75 psi)
(higher possible) |
6.9 bar (100 psi)
|
| Accuracy and repeatability |
high
(frequent recalibration) |
high
(non-return valve!) |
very high
|
| Autoclavability / Sterility |
++ tubing!
|
steam
(not with Teflon gears!) |
very high
|
| Calibration / Recalibration |
high frequency
|
frequent
|
low frequency
|
| Chemical inertness |
tubing!
|
high
|
very high
|
| Corrosion resistance |
tubing!
|
good
|
high
|
| Cross-Contamination |
virtually none
(tubing exchange) |
yes (thorough flushing is required)
|
yes (thorough flushing is required)
|
| Dead volume |
practically none
|
5-45 ml
(depends on pumphead) |
very low
|
| Contact with mechanical parts of the pump head |
no
|
yes
|
yes
|
| Dry-running |
no problem
|
destroy the gears
|
should be avoided
|
| Fittings |
hose barb
|
hose barb or screw coupling
|
hose barb or screw coupling
|
| Flow rate sensitivity to differential pressure |
low
(depends on tube bed) |
considerable
|
not significant
|
| Changing pump heads |
very easy (MCP/BVP)
|
easy
|
possible
|
| Leakage susceptibility |
depends on tubing life
|
low
|
low
|
| Maintenance (time and costs) |
very low
(only tubing exchange) |
medium
(service kits) |
low
(thorough flushing) |
| Multi-channel systems |
yes
|
no
|
no
|
| Pulsation ratio |
low to high
(number of rollers!) |
very low
|
usually high
(tubing and piston size!) |
| Pumping high-viscosity liquids |
++
|
(+)
|
+
|
| Pumping suspensions, sludges, and particles |
++
|
--
|
+
(max. 0.8 mm diameter) |
| Self-priming |
yes
|
no
|
yes
(tubing diameter!) |
| Shearing forces |
low
|
very high
|
high
|
| Siphoning effect when pump is stopped |
no
|
yes
(non-return valve!) |
no
|
| Suction lift |
7 – 8 m
|
dry: ~0.2 m
wet: ~0.75 m |
4.5 m
|