Operation Manual VISATRON® VN115/87plus EX 06/2016
Page 12
SCHALLER AUTOMATION D-66440 Blieskastel / Saarland / Germany / Industriering 14 / P.O Box 1280
Industrielle Automationstechnik GmbH & Co. KG Tel. +49(0)6842-508-0 / Fax -260 / eMail: info@schaller.de / www.schaller.de
Figure 2: VISATRON® VN115/87plus EX oil mist detector with protection cover
and pressure regulator unit
The suction system always requires a so called 'suction funnel' (see page 20, Figure
13) at each suction point. This prevents the system against incoming splash oil.
During normal operation mode of an engine the OMD sucks out a small
concentration of oil mist which was generated by blow-by or mechanical spraying.
This oil mist may fall out in the suction pipes and must be drained out the pipes.
Ideally, drainage flow back ends inside the engine’s crankcase.
Figure 3:
Optional Siphon block VN180 optional Pipe siphon
The best method on a VN115/87plus EX installation to drain the system is to use
pipe siphons. Also recommended is the use of siphon blocks.
On 2-stroke engines the crankcase and the combustion chambers are separated by
stuffing boxes, which let the crankcase be nearly free of blow-by. Therefore it's also
possible to use the suction funnel as draining device. In this case it is necessary to
mount the suction pipes with an inclination of greater than 6°.
It is not allowed to blow the air into the engine room!
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