Process Control Instruments and Field Devices
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EH Stamoclean CAT411 Self-cleaning Cross-flow microfilter for pressure pipes. Colorimetric. Bacteria-free filtration of aqueous samples with PTFE Filter membrane. POM Housing.

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The CAT411 microfilter is a special cross-flow filter for sampling from pressure pipes for the purpose of continuous online monitoring.

A self-cleaning effect results from the flow of medium at the filter.

  • Wastewater treatment plant
    • Return activated sludge up to max. 4 g/l (4000 ppm) dry matter
    • Excess sludge up to max. 4 g/l (4000 ppm) dry matter
    • Secondary clarification
  • Industry
    • Pressure on filter 0.2 to 1 bar (3 to 15 psi)
    • Sampling in the bypass at higher pressures
Your benefits
  • High degree of operational safety thanks to robust design
  • Simple cleaning reduces operating costs
  • Easy and fast replacement of filter membranes
  • Long service life
  • Short response time of downstream measuring device due to low dead volume
  • No separate energy requirements
  • Easy installation
Mode of operation

A sample flow of 0.8 to 1.8 m 3 /h (3.5 to 8 gal/min) is permanently conducted through the microfilter via a pressure pipe. Some of the sample passes the filter membrane and is then conveyed to the measuring device as filtrate.

The principle of cross-flow filtration is used for sampling. The PTFE filter membrane separates particles > 0.45 μm from the filtrate. These particles collect in front of the filter membrane and are washed away with the sample flow.

The medium is conducted in a meander-like channel through the filter element. A consistently high flow velocity is achieved in this way. This causes the self-cleaning effect. Mechanical drives to generate a flow at the filter surface are therefore not required.

Measuring system

A complete sample conditioning system comprises:

  • Stamoclean CAT411 microfilter
  • Collecting vessel
  • Analyzer

A sensor with a flow assembly can also optionally be integrated into the measuring system.

Measuring principle



Sample Preparation


370 x 200 x 70 mm
14.43 x 7.8 x 2.73 inch


Housing CAT 411: POM
Fastening screws: Stainless steel
Seals: Perbunan
Filter membrane: PTFE

Process temperature

5C ... 50C
41F ... 122F

Ambient temperature

5C ... 50C
41F ... 122F

Process pressure

0,2 ... 1 bar
3 ... 14.5 psi

Consistency of the sample

to max. 8 g/l TS


Sample preparation made of pressure pipe without additional pump possible, otherwise a feed pump is needed


Water / Wastewater / Processwater


Filter membranes necessary

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