Specifications (contd.)
Cycle rates
Pressure limits
To attain optimal dispense accuracy, pressure on both the inlet and the outlet side of the pumpmust be kept
between ± 0.5 psi (0.035 bar) and 0 psi (equating to a head of ± 12 in / 30 cm of water).
During the pump’s up-stroke, suction is created on the inlet. Positive pressure is generated at the outlet during the
down-stroke. When the pump is not actuated, it will shut off flow as long as the pressure on the inlet does not
exceed themaximum holding pressure. To ensure correct operation, pressure on the inlet side should never
exceed 2 psi evenwhen the pump is in the closed position. The check valves in the pump prevent fluid from
flowing against the intended flow direction.
To operate the solenoidmicro pumps, first place the rated voltage over the pump’s coil (causing the intake stroke)
and then turn the voltage off again (causing the output stroke). To achieve the optimal dispense accuracy, the pump
must remain in the on and in the off position for aminimum amount of time. To operate the pumps at less than the
maximum cycle rate, the on-time should remain unchanged and the off-time should be lengthened appropriately.
Dispense volume accuracy
Valve Series
Inlet suction
(priming w/air)
Inlet suction
(after priming)
Outlet pressure
090SP 1 psi / 0.07 bar
3 psi / 0.20 bar
3 psi / 0.20 bar
120SP 2 psi / 0.15 bar
5 psi / 0.35 bar
5 psi / 0.35 bar
130SP 2 psi / 0.15 bar
5 psi / 0.35 bar
5 psi / 0.35 bar
150SP 2 psi / 0.15 bar
5 psi / 0.35 bar
5 psi / 0.35 bar
Valve Series
Minimum on
time
Minimum off
time
Maximum
cycle rate
090SP
150msec
350msec
2.0Hz
120SP
150msec
350msec
2.0Hz
130SP
150msec
350msec
2.0Hz
150SP
200msec
400msec
1.6Hz
Valve
Series
Minimum
setting
Maximum
setting
Max flow
rate
090SP
Dispense volume:
8 µl
8 µl
1.0ml /min
Set-point accuracy:
+/- 25% +/- 25%
Repeatability:
+/- 5% +/- 5%
120SP
Dispense volume:
10 µl
60 µl
7.2ml /min
Set-point accuracy:
+/- 4% +/- 2%
Repeatability:
+/- 3% +/- 1%
130SP&
120SP
w/PTFE dia.
Dispense volume:
10 µl
50 µl
6.0ml /min
Set-point accuracy:
+/- 5% +/- 5%
Repeatability:
+/- 3% +/- 1%
150SP
Dispense volume:
100 µl
250 µl
25ml /min
Set-point accuracy:
+/- 5% +/- 3%
Repeatability:
+/- 1% +/- 0.5%
