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PAP 612 Aerosol Photometer

Process Aerosol Photometer PAP 612 for analysis of particle concentration in aerosols, extinction/scattering light for twi wavelength, best for blow by testing

The Process Photometer PAP 612 is a combined in-line extinction and scattered-light photometer (ES) for blow-by measurements (aerosol concentration determination) with double-running test sections and two wavelengths, which can operate in over- or underpressure.
Process Aerosol Photometer PAP 612, front viewPAP 612 with Remote Control Unit RCU 612
Process Aerosol Photometer PAP 612, front viewPAP 612 with Remote Control Unit RCU 612
The device is primarily designed for investigations of crankcase ventilation of combustion engines. Thus it should support the development and testing of filter systems. Due to its compact design, its use is conceivable on test rigs for engines, on swivelling test rigs, under lab conditions as well as for test drives in field use.
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  • transmission and scattered-light measurements of 2 wavelength with high time resolution
  • low uncertainty of measurement through two different measuring lengths
  • compact design for the use at laboratory, engine and tilt test stands and for field use
  • operation in over- and underpressure
  • software PAPWin for calibration, configuration and data acquisition


  • detection of unwanted fluids in pipe systems for gas transport (e.g. gushes of oil or detection of condensation)
  • in-line characterisation and concentration monitoring of blow-by aerosols
  • concentration measurements in aerosols
  • determination of mean particle sizes of submicron aerosols

The instrument is based on a dual extinction and scattered-light measurement, which are offset at an angle of 90°. By an alternating circuit of the lighting unit (switching of the LEDs) the two extinctions and the two scattered-light intensities are measured successively. The PAP 612 records measuring signals which are internally evaluated. It can be used with the software PAPWin by a USB interface.

Parameter titleUnitValue
measurand(s) - extinction, scattering light
measuring range, concentration g/m³ min. 2
power supply - 12 V DC; 100 mA (power supply via USB)
wave length of light source nm 470 (blue), 630 (red)
hose connector, inlet/outlet mm 28 (nominal diameter)
weight kg 1,2
  • Sauter H, Mathiak D, Müller J, List S Kurbelgehäuseentlüftung - direkte Messung von Ölaerosolen MTZ - Motorentechnische Zeitschrift 73 (2012) 0, 140-145

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