Pump MicroPro™

The MicroPro™ syringe pump is specially designed to meet the requirement of extremely small eluent streams and SunChrom is its exclusive dealer in Germany. This pump can provide a flow rate of 10 nL/min in isocratic mode or 1 µL/min in gradient mode. Typical applications for the MicroProTM syringe pump are in micro and nano HPLC and in process control. Since the pump is modular it provides a perfect adjustment to the requirements.
This syringe pump allows a split-free delivery of the eluent at flow rates as low as 1 µL/min in gradient mode. Below that level a simple and reliable splitter is available from SunChrom. Therefore the use of columns with an inner diameter from 50 µm to 2 mm with an extremely stable flow rate is possible.


A reduced inner diameter of the column is used when
  • only a very small sample volume is available
  • the concentration of the analyte in the sample is very low
  • there are many compounds that co-elute near an important analyte
  • the mobile phase is extremely expensive (e.g. deuterated solvent)
  • an on-line or off-line coupling to a mass spectrometer is desired
In case a narrowbore, microbore or capillary HPLC is used or a direct coupling to a mass spectrometer is desired the MicroPro™ syringe pump always delivers the correct flow. A minimal system volume and the absence of a dead volume are significant requirements for the successful implementation of micro and nano HPLC.



Precise, reproducible and absolutely pulse free

The MicroPro™ syringe pump can be operated in several modes depending on the employed tubing . All parameters can be entered directly via a time based program on the instrument keyboard or via an optional PC control.
  • single syringe: the flow is generated under pressure regulation (e.g. isocratic HPLC)
  • several independent syringes: up to 4 syringes deliver individual or mixed eluents
  • reciprocating mode: solvent is continually delivered without any pressure variations
  • gradient mode:  up to 4 eluents can be mixed  in compositions ranging from 0 to 100%. The concentration of the eluents can be changed manually or via a time based program.
A control program compatible with windows is already installed on the HPLC module. The LCD-Panel and a graphic interaction screen with all necessary pump parameters provide easy use.
If required there are two syringe sizes, manual and automatic high and low pressure valves, an oven and a pressure regulator available.


Independent syringes Maximum of 4
Operating modes
  • Single syringe
  • two reciprocating syringes
  • several independent syringes
  • gradient up to four syringes
  • constant pressure
Wetted parts
  • Stainless steel
  • UHMW
  • Polyethylene
  • PTFE
  • PEEK
Syringe heating Optional, request when configuring system
Single syringe pump (L x H x W) 159 x 343 x 419 mm
Double syringe pump (L x H x W) 317 x 343 x 419 mm
Weight 10 (single syringe) or 17 kg (two syringes)
Power requirements 100/230 V ±10 %; 50/60 Hz
Outputs 8 TTL or contact closures, 0-10 mV, pressure flow, %B, %C, %D
Inputs External start, stop, wait, fill
Serial port RS 232

Flow rate (2 ml Syringe) 0,01 – 2.000 µL/min
Flow rate (10 ml Syringe) 0,05 – 10.000 µL/min
Flow increments 0,01 µL/min
Minimum flow in gradient mode 1 µL/min (with 2 ml Syringe) 5 µL/min (with 10 ml Syringe)
Flow reproducibility ± 0,1 %
Filling time Minimum 60 seconds, programmable by user
Maximum pressure 10,000 psi = 670 bar = 67 MPa (Format of pressure units is selectable)
Pressure limits Minimum and maximum limits are selectable
Dynamic mixer 15, 50 or 150 µL
Static mixer 3 or 5 µL

Number of programs 10
Number of program steps 300
Number of cycles 999
PC control available

Part number Short description
HPLC10g MicroPro HPLC 10g (10 mL dual syringe, gradient mode)
1431 MicroPro HPLC 2g (mL dual syringe, gradient mode)
1426 Piston seal kit 2 mL
1428 Piston seal kit 10 mL
1431.10 Conversion kit 2 to 10 mL
1431.R Rotor seal
5226 Syringe 10 mL
5237 Syringe 2 mL
5576 Piston unit 2 mL
5578 Piston unit 10 mL