Condensation particle counter for exhaust measurements in accordance with PMP requirements

Condensation particle counter for exhaust measurements in accordance with PMP requirements


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Condensation particle counter for exhaust measurements in accordance with PMP requirements


The Palas® PMP-CPC 100 condensation particle counter is suitable for PMP applications in accordance with the ILCE EU standard. The counting efficiency at 23 nm is 50 %. The CPC features a very steep cut-off curve and has got a counting efficiency of more than 90 % at already 30 nm (see fig. 1). Because of this counting efficiency curve volatile and semi-volatile nanoparticles originating from nucleation of gaseous compounds are excluded from measurement.

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Fig. 1: Counting efficiency curve of the PMP-CPC measured at the Leibniz Institute for Tropospheric Research

Volume flow regulation is performed using an internal flow sensor with controlled membrane pump that has a long service life. In contrast to regulation with a critical nozzle, contamination of the system cannot lead to a drop in volume flow. Furthermore, the volume flow can be recalibrated by the user. This reduces the maintenance interval.

The PMPD 100 and PMPD 1000 dilution systems with integrated thermal conditioner can be used together with the PMP-CPC 100 to eliminated particles that originate from condensation of volatile compounds in engine exhaust gases, as provided for in the GRPE and PMP regulations.

In addition to their number, the PMP-CPC 100 also measures the size of the droplets and gives the user additional information concerning the condensation process. This patented (German patent no.: DE 10 2005 001 992 A1) working fluid delivery system provides high condensation stability. Even under negative pressure, stable condensation is guaranteed through continuous delivery of working fluid.

In addition, the modularity of the components enables the user to perform most maintenance tasks (e.g. cleaning, pump replacement).

For exhaust emission tests , the PMP-CPC 100 supports a standardized interface with various protocol selection options, e.g. Modbus, AK protocol and features, such as remote access and data storage on the Internet or internal networks.

Figure 2 presents the principle of operation of the PMP-CPC [1]. The aerosol with nanoparticles enters the UF-CPC at the bottom and reaches the heated evaporation chamber – the saturator first.

Within the saturator, the working fluid is moved helically around the flow area of the aerosol, resulting in a more homogeneous contact area compared to designs where only one or two walls of the saturator are lined with a porous material that is soaked with the working fluid.

In addition, the working fluid is circulated continuously from the reservoir to the constantly heated helical and U-shaped channel and back to the reservoir at a flow rate that can be adjusted to accommodate different working fluids.


Fig. 2: Principle of operation of the condensation particle counter (PMP-CPC 100)

Downstream from the evaporation chamber, the aerosol and the saturated carrier gas enter a cooled area, the condenser, in which the working fluid condenses onto the nanoparticles, forming droplets in the μm size range.


Based on continuous customer feedback, the user interface and software have been designed for intuitive operation and real-time control of measurement data and parameters. In addition, the software provides data management with the integrated data logger, sophisticated export capabilities, and network support. The measured data are able to be displayed and evaluated with many available options. If a specific display is desired, we can implement it for you.


[1] Patent: DE 10 2005 001 992 A1


  • This novel and patented working fluid delivery system provides the user with the option to quickly switch between butanol and isopropanol, for example, or even water.
  • The PMP-CPC is able to count up to 2,000,000 particles/cm3 in single count mode, depending on the sensor in use (able to be switched out by the user).
  • Integrated computer with 7'' touch screen
  • Intuitive user interface with sophisticated software for data analysis
  • Integrated data logger
  • Unlimited network compatibility that supports remote control and data storage on the Internet
  • Integrated interface for process control applications


Measurement range (size)

4 – 10,000 nm
Measurement range (number CN)

1 • 105 particles/cm3 (single count mode), 1 • 105 - 107 particles/cm3 (nephelometric mode)
Volume flow 0.9 l/min (Butanol)
Data acquisition
Digital, 20 MHz processor, 256 raw data channels
Light source

User interface
Touch screen, 800 • 480 pixel, 7"
Dimensions 29 • 24 • 35 cm (H • W • D)
Data logger storage

4 GB
Software PDAnalyze
5% (single count mode); 10% (nephelometric mode)
Response time t90 = 2.8 s, t90–10 = 2.0 s
Operation liquid Butanol
Installation conditions
+10 – +30 °C (others on demand)


  • Exhaust gas measurements for diesel and spark-ignition engines

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