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Getting started
Instrument description
The HEPaC is a hand-held, battery powered instrument based on the partector2 by na-
neos (naneos.ch) to measure the number concentration of nanoparticles. It displays the
measured data on a graphical display. The device can communicate with devices sup-
porting Bluetooth LE. Main application is the measurement of particles emitted by diesel
engines according to the Swiss regulation for construction engines
A Win10 Software package is supplied to monitor the measuring process on a PC/Tab-
let etc. and to produce the test report, but all the data processing is done in the HEPaC.
2
Figure 1: HEPaC main parts
Figure 1 shows a picture of the instrument, Figure 2 the internal setup. The sampled ex-
haust is first heated to a temperature of 195°C to evaporate volatile species. To avoid
renucleation the whole sensor is heated up to 55°C. Particles are then charge by a uni-
polar diffusion charger (Corona charger). The ion current in the charger is measured
and kept constant by a feedback control loop. The charge particles enter in to an elec-
trostatic precipitator, operated pulsed. The charge pulses, leaving the precipitator enter
into a stage, where the charge, induced by the charge pulses is measured. Min. and
1
Verordnung 941.242 des EJPD über Abgasmessmittel für Verbrennungsmotoren
1
3
1
aerosol inlet
2. Sampling tube extensions
3
evaporation tube (caution hot)
10
4
power button
9
5
display
6
right key, start measurement
7
middle key, hold
8
left key, get info
9
12V connector
10 aerosol outlet
1
.
4
5
6
7
8
5
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