Low temperature & liquid gas dosing: metering below 0°C

KNAUER pumps cover a wide range of different demands. Chemical compatibility and working temperatures are just two possible requirements. Pumping liquids at low temperatures may be required in flow chemistry or in various applications involving liquefied gases. The wetted parts of the KNAUER pumps are capable of working under these conditions. With an optional pump head cooling device these pumps are perfect for dosing or feeding of liquefied gases or cooled liquids

Pump requirements

  • Suitability for low liquid temperatures
  • Pump head with cooling option
  • High delivery pressure
AZURA P 4.1S pump with pressure sensor

Pump features

  • Capability to meter pre-cooled liquids (down to -10 °C)
  • Pump head can be thermostated with optional pump head cooling device
  • Optimized pump head for low temperature applications
  • Suitable for liquid gases e.g. NH3 or CO2
  • Flexible fluid connections
  • Easy integration into process control systems via analog and digital signals
  • Optimized high pressure inlet bushings for feeding of liquid gases

Application examples

  • Metering of liquid CO2
  • Metering of liquid NH3

Operating parameters

Max. delivery pressure40 MPa (400 bar, 5800 psi)
Flow rate range0.01–100 ml/min
Max. viscosity100 mPa·s
Liquid temperature range

-10–20 °C (14–68 °F)

Selected KNAUER pumps for low temperature & liquid gas dosing

Max. flow ratePump head materialPump type



AZURA w/o
pressure sensor

AZURA with
pressure sensor

BlueShadow
40 P

10 ml/min

stainless steel

AZURA P2.1S APG90EA

AZURA P4.1S APG20EA

BlueShadow 40P APC30EA

stainless steel
(titanium free)

AZURA P2.1S APG90BF

50 ml/min

stainless steel

AZURA P2.1S APG90FA

AZURA P4.1S APG20FA

BlueShadow 40P APC30FA