4 System Overview
11
remote controlled via Ethernet. The components are mounted in standard 19" cases and can
easily be integrated in a test bench equipped with 19" racks and Ethernet connections.
Fig. 4.2 shows all pneumatic components of the ThermoDilution system consisting of the testo
ASET15-1 and the testo MD19-3E. The pathways of dilution air, raw gas and diluted measuring
gas are visible.
No external dilution air is needed. Ambient air is drawn and filtered inside the case of the testo
ASET15-1 and fed to the testo MD19-3E where it is needed to dilute some raw gas. The primarily
diluted gas then returns to the testo ASET15-1. In the evaporation tube volatile particle
components are transformed into the gas phase. Finally a certain adjustable amount of
secondary dilution air is added in order to reduce the gas temperature, to enhance the measuring
gas flow, and to achieve particle concentrations within the range of the particle sensors set
downstream the dilution system.
4.5.
Control Elements and Connections
4.5.1.
Important Remarks
The testo ASET15-1 and testo MD19-3E are constructed for dilution and conditioning of exhaust
or flue gas from combustion processes in diesel engines, light oil burners or wood or coal
combustion. It may also be used for gases or aerosols emerging from other processes.
Electric Shock
When in operation, any electrical equipment can produce dangerous voltages.
Ignoring these warnings may result in serious injury or damage of the equipment.
It is mandatory that only suitably qualified personnel are allowed to work on this
instrument. Satisfactory and safe operation of this instrument necessitates
proper handling in transportation, storage and installation as well as careful
control and maintenance.
Skin Burn
Parts of the testo MD19-3E diluter head are heated up to 160°C / 320°F. Also
the outer surface of the testo ASET15-1 evaporation tube becomes a hot surface
when the temperature inside is increased up to 400°C / 752°F. Always use heat
protection gloves when handling hot parts.
Aerosol
Diluted or undiluted aerosol may escape from the system if the gas return port of
the testo MD19-3E is are not thoroughly connected to an offtake or if the
additional evaporation tube inlet port 33) of testo ASET15-1 is open. If some gas
escapes at the excess gas port 12) it is filtered and contains no particles but may
contain diluted gaseous toxic exhaust components.
4.5.2.
Front View
In Fig. 4.3 all ports and operating elements situated at the front side of testo ASET15-1 with
integrated testo MD19-3E are shown. The testo ASET15-1 elements are described below the
figure while the testo MD19-3E controls are explained in the testo MD19-3E operations manual.
Fig.4.3 : front view of testo ASET15-1 with integrated testo MD19-3E
