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In addition to a production plant, a manufacturer of biodegradable polymers also has an existing pilot plant for optimizing the production process, in which a catalyst is added on a relatively large scale. The process engineers of this company have optimized the process in such a way that much less catalyst needs to be added. Dosing of only microliters per minute! A great development in view of production costs and for the environment! Only the right equipment remains!

The request came to Suurmond through existing contacts, because of previous successful experiences with solutions provided by Suurmond.

In this case, a solution was needed for dosing the catalyst in microliters per minute, in a process in which a high differential pressure had to be bridged and which also had to be ATEX compliant.

Characteristics of the main stream (polymer): 

System pressure 20 – 25 barg
Mass flow 60 – 135 kg/hour


Parameters for the requested solution:

Volume 0.0024 – 0.0054 ml/min (≡ 3.0 … 6.75 mg/min)
Suction pressure 1,013 bar(a)
Discharge pressure 36 … to max. 50 bar(a)
Density 1,251 kg/l
Viscosity 350 mPas
Ambient temperature 30 °C
ATEX zone 2, IIC, T3


Our solution

Suurmond offers a wide range of micropumps from HNP Mikrosysteme GmbH for dosing microliters per minute, with pulsation-free solutions for high pressure, low pressure, inert processes and ATEX. In this case, an ATEX version of an HNPM pump could not meet all the requirements.

Although the HNPM micropump mzr-4605 perfectly meets all process requirements, this type of micropump is not ATEX. In order to be able to meet the ATEX requirements, Suurmond installed the complete HNPM pump, i.e. with drive, in an ATEX enclosure. These micropumps are so small / compact that they can be easily installed with motor and all!

The result is a small, compact suurDOS® unit in an ATEX enclosure, with the following characteristics:

  • The unit is equipped with a T-type 10 μm filter to protect the pump
  • The pump is equipped with an adjustable servo drive
  • A mass flow meter (Coriolis) is selected to accurately measure and control the flow in a closed loop
  • A pressure transmitter is installed on the discharge side to monitor the pressure
  • A safety valve protects the positive displacement pump
  • The check valve prevents backflow

Micro pump in ATEX enclosure for pulseless dosing micro liters at high differential pressure.

micro dosing

This suurDOS® is equipped with very thin tubing for dosing micro liters.