Ismatec pumps and tubing
Ismatec Quality Pumps

Decision Chart for Different Pump Technologies

Advantages & Limitations
Peristaltic pumps
Gear pumps
Rotary piston pumps
Max. flow rate
13000 ml/min
(higher possible)
12000 ml/min
(higher possible)
2300 ml/min
Min. flow rate
< 0.001 ml/min
1 ml/min
0.025 ml/min
Drive speed (max)
500 rpm
(Flowmaster)
6000 rpm
(MCP-Z)
1800 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
(nuber 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

Last modified 05/03/09