Bio-Chem Fluidics 120SP Series Micro-Pump: accurate dispensing for analytical OEM instruments
The 120SP Series is the ported entry-level version in the Bio-Chem Fluidics Micro-Pump family. The pump is solenoid-driven and delivers a discrete, repeatable liquid volume of 20 to 60 µl per cycle, at a maximum flow rate of 7,2 ml/min. The operating mechanism is fully separated from the fluid path by a diaphragm, so the medium never comes into contact with the solenoid or spring.
The 120SP is supplied as standard with a PPS or PEEK housing, depending on the required chemical resistance. Diaphragm and check valves are available in PTFE, EPDM, FKM or FFKM, so the combination of wetted materials can be matched to the specific liquid and application.
Applications
The 120SP is ideally suited for water analysers, clinical diagnostic equipment and other analytical OEM instruments that require accurate reagent dosing, waste removal or dispensing of sterilisation fluid. The pump is self-priming and can draw liquid from an unpressurised reservoir up to 1,3 metres below the pump, without auxiliary pressure at start-up.
Choice of material
The 120SP is available in two housing materials. PPS offers good chemical resistance with high structural strength and is suitable for most analytical applications. PEEK offers higher chemical resistance and withstands a wider range of aggressive media, including concentrated acids and solvents.
For the diaphragm, the choice is between EPDM (for aqueous solutions and less aggressive media) and PTFE (for higher chemical inertness). For the check valves, you can choose from EPDM (standard), FKM (for solvents and oils) or FFKM (for the harshest chemical conditions).
Operation and control
The 120SP can be cycled at a maximum frequency of 2 Hz. The "on" time is fixed at 150 ms and must not be changed, to maintain dispensing precision. The flow rate can be reduced by extending the "off" time. The pump runs on 12 VDC or 24 VDC and consumes 4 Watt, effectively 1,2 Watt at maximum cycle frequency.
The pump is supplied with a 3-meter silicone connection cable with open ends, suitable for direct connection to the instrument's control system. The wiring is PTFE-coated.
Properties
- Dispense volume: 20, 30, 40, 50 or 60 µl per cycle
- Setpoint accuracy: ±10%
- Repeatability: ±5%
- Max. flow rate: 7,2 ml/min (at 60 µl/cycle, 2 Hz)
- Internal volume: 105 µl
- Connections: 2x 1/4"-28 UNF, flat-bottom
- Housing material: PPS or PEEK
- Diaphragm material: PTFE or EPDM
- Valve materials: EPDM, FKM or FFKM
- Power supply: 12 VDC or 24 VDC, 4 Watt
- Max. cycle frequency: 2 Hz
- Fixed "on" time: 150 ms; minimum "off" time: 350 ms
- Self-priming, suction lift up to 1,3 m
- Outer diameter: 25,4 mm
- Total length: 63,5 mm
- Mounting: via 2x #4-40 UNC mounting holes in the pump base
Technical specifications
| Feature | 20 µl | 30 µl | 40 µl | 50 µl | 60 µl |
|---|
| Max. flow | 2,4 ml/min | 3,6 ml/min | 4,8 ml/min | 6,0 ml/min | 7,2 ml/min |
| Accuracy | ±10% | ±10% | ±10% | ±10% | ±10% |
| Repeatability | ±5% | ±5% | ±5% | ±5% | ±5% |
| Internal volume | 105 µl | 105 µl | 105 µl | 105 µl | 105 µl |
| Electrical | 12 VDC | 24 VDC |
|---|
| Power | 4,0 W | 4,0 W |
| Power consumption | 0,32 A | 0,16 A |
| Eff. continuous power | 1,2 W | 1,2 W |
