6 Operating Instructions
16
6
Operating Instructions
6.1.
Start Up
Instructions in the following chapters are given for operation with an integrated
testo MD19-3E rotating disk diluter mounted in the left half of the testo ASET15-1
rack case.
For starting up some measurements using the dilution system consisting of the testo MD19-3E
and testo ASET15-1 follow these steps:
Connect the connector 31) at the rear side of the testo ASET15-1 case to mains supply.
The mains switch 30) should remain switched off. Details of the power supply are
described in chapter 7.
Prepare the testo MD19-3E Rotating Disk Diluter to be ready for operation according to
the testo MD19-3E manual. Connect its diluter head via pneumatical and electrical
connection to the control unit which has to be integrated into testo ASET15-1.
Connect the nanoparticle instrumentation to the measuring gas output 13) using the gas
connector plug 23) for tubes with inner diameter 6
mm.
Connect the waste gas output of the testo MD19-3E to the exhaust or a separate offtake.
Connect the excess measuring gas output of the testo ASET15-1 12) to an exhaust
suction system
The two gases must be independently connected to the exhaust suction. The
pulsation of the testo MD19-3E pump might have an influence on the flow regulation
in the Air Supply of the testo ASET15-1.
The tube connected to testo MD19-3E pump outlet can fill with liquid from
condensation if the diluter head is connected to undiluted engine exhaust which is
cooled down on its way to the control unit.
Ensure the raw gas pump switch on the testo MD19-3E front panel and the testo MD19-
3E air supply switch 6), the dilution air supply switch 4), and the evaporation tube heating
switch 17) on the testo ASET15-1 front panel are all in OFF position.
Switch on the mains switch 30) at the rear side of the unit.
Switch on testo MD19-3E dilution air supply 6) at the testo ASET15-1 front panel. The
testo MD19-3E air supply LED 7) indicates if the electronically controlled dilution air flow
is within its specified tolerance of +/-
3
% (green) or not (red).
6.2.
Evaporation Tube Heating Up Procedure
The temperature inside the evaporation tube 34) is measured in the gas stream and indicated on
the actual temperature display 18) at the top of the temperature controller which is shown in Fig.
6.1. The evaporation tube heating is activated and deactivated using switch 17). Heating only
makes sense if dilution air is supplied to the primary diluter and measuring gas passes the
evaporation tube. Nevertheless there is no risk of damage by overheating even if no gas passes
the evaporation tube.
Fig.6.1: TemperatureController
