Dosing of aggressive liquids: tackling challenges with the right pump

Strong acids and bases are often required for different liquid applications. KNAUER offers pumps with a choice of different pump head materials which can be used for demanding dosing tasks. Furthermore the pump design allows an easy replacement of parts which come in contact with aggressive and corrosive chemicals.

This makes the KNAUER pumps ideal for metering aggressive liquids.

Pump requirements

  • Chemical compatibility of wetted parts
  • High delivery pressure
  • Easy maintainability
Pump heads with optimized materials for different application tasks

Pump features

  • Different pump head materials for extended chemical compatibility, including stainless steel, ceramic, and Hastelloy® C
  • Optimized materials for aggressive liquids
  • Suitable for a large variety of aggressive media
  • Easy pump head maintenance to reduce downtime
  • High dosing accuracy even with fluctuating pressure conditions
  • Large variety of accessories allows the easy integration of these pumps into dosing environment

Application examples

  • Metering of ammonia/amines
  • Metering of inorganic acids (H2SO4, HNO3, HCl)

Operating parameters

Max. delivery pressure40 MPa (400 bar, 5800 psi)
Flow rate range0.01–50 ml/min
Max. viscosity100 mPa·s
Liquid temperature range

20–60 °C (68–140 °F)

Selected KNAUER pumps for dosing of aggressive media

Max. flow rate Pump head material Pump type

AZURA w/o pressure sensor

AZURA with pressure sensor

10 ml/min

ceramic AZURA P2.1S APG90EB AZURA P4.1S APG20EB
Hastelloy ® C AZURA P2.1S APG90EC

50 ml/min

ceramic AZURA P2.1S APG90FB AZURA P4.1S APG20FB
Hastelloy ® C AZURA P2.1S APG90FC