Real-time measurement of particle size distribution Electrical Low Pressure Impactor ELPI+™
The ELPI+™ is the new, optimized version of the widely used and proven ELPI™ system. The ELPI+™ enables the real-time measurement of particle size distribution and concentration within a size range from 6 nm to 10 µm with a measuring frequency of 10 Hz. Features of the ELPI+™ include real-time measurement, single operation, measurement over a wide concentration range, a wide particle size range, and a rugged design for use in harsh environments. The use of impactor technology allows chemical analysis of size-classified particles after measurement. In addition, the ELPI+™ can be used to measure particle charge distribution in real time and for gravimetric impact measurements. All these features allow the ELPI+™ to be used in a variety of particle measurement applications.
Attributes
- Particle size determination according to aerodynamic diameter, independent of optical properties
- Large particle size range from 6 nm - 10 µm 14 size fractions
- Possibility of chemical analysis of size-classified samples
- Measurements in a wide concentration range possible Automatic measurements of the charge distribution
- Automatic flow check and pressure adjustment
- Independent single operation or monitoring via a notebook using the ELPI+VI software
- Large 7" display with graphical user interface
- 6 analog inputs, 3 analog outputs, each 0-10 V
Measuring procedure of the ELPI+™
The measured current signal is directly proportional to the concentration of the number of particles. The particle separation in each individual impactor stage depends on the aerodynamic size of the particles. Measured current signals are converted into particle size distributions using relations describing the characteristics of the charging unit and impactor platforms and depending on particle size. The result is the particle number concentration and size distribution in real time. By switching off the charging unit, the ELPI+™ can also be used for particle charge distribution measurements.
ELPI+™ Advantages
- Additional impactor stage at 17 nm
- 10 Hz Sampling rate
- Optimized operation of the charging unit
- Optimized design with extended size resolution
- Optimized calculation methods
- Simplified user interface
- individual operation
- Wide particle size and concentration range
- Comprehensive calibration of each instrument
- Simple and robust construction
ELPI+™ Applications
- Investigations of combustion processes
- Outdoor/Indoor Measurements
- Measurements of car exhaust gases
- Blowby gas measurements
- Pharmaceutical measurements
- Particle charge distribution measurements
- Measurements of filter efficiency
- nanoparticle measurement
