5 Installation and Setup
15
5.2.
Gas/Aerosol Connections
5.2.1.
Quick Couplings at the front of testo ASET15-1
testo ASET15-1 is equipped with two quick coupling elements to connect the device to an excess
gas offtake (male coupling 12)) and to the subsequent sensor(s) (female coupling 13)). One
female excess gas coupling 22) is included in testo ASET15-1 delivery and one male measuring
gas plug 23) is delivered with testo MD19-3E rotating disk diluter. Both coupling elements are
also available from Testo SE & Co. KGaA.
Fig. 5.3 shows how the male plug of a tube is disconnected from the female quick coupling.
Pushing down the button at the top of the quick coupling will release the plug which can be pulled
out then.
Fig.5.3: handling of quick coupling at the front side
The plug catching ring will remain down when the plug is disconnected from the coupling. When
a plug is pulled in, the ring and button will jump up and automatically lock the plug. If the plug
cannot be inserted, the fixation ring might be in the wrong position. Push down the release button
and insert the plug again.
The excess gas connection 12) meets the same standard but male and female connectors are
exchanged.
5.2.2.
Connect a Sensor to the Measuring Gas Inlet of the Evaporation Tube
The connection of a sensor e.g. a particle counter (CPC) to the additional evaporation tube inlet
port 32) might be of interest to measure the loss of volatile particles in the evaporation tube by
evaporation. To prepare the connection of the sensor proceed as follows:
Dismount the safety cage 25) by loosening the 5 nuts 24).
Remove the closing cover from the additional evaporation tube inlet port 32).
Mount the short stainless steel tube to the additional inlet using the Swagelock stainless
steel nut and the two PTFE ferrules. All these parts are included in the accessories.
Remount the safety cage before you connect your sensor to the steel tube.
Drawing measuring gas on the inlet to the evaporation tube reduces the flow in the evaporation
tube and influences therefore the setting of the dilution factor as explained in chapter 6.3.3.