Visatron VN115/87plus

VISATRON VN 115 series continuously and simultaneously evacuate crankcase atmosphere from each crankcase compartment between two main bearings.

The VN 115 and VN 116 series use a header-suction-tube system for this purpose. The oil mist detector is positioned in the middle between two header-suction-tube sections located on the engine sides; from these sections, single-suction tubes branch off near the compartments. These tubes are considerably thinner than the header-suction tubes and they have a throttling effect. Owing to the large header-suction- tube diameter the vacuum and consequently the sample flow at each suction point remain virtually constant. The arrangement of the detector in the middle of the header-suction tube results in an optimally short sample running time in the tube system.

In the detector itself the sample mixture of both header-suction-tube sections is conducted through an optical turbid metric channel. Subsequently, the oil mist is discharged together with the exhaust air from the wear-resistant air jet pump.

The turbidity of the crankcase atmosphere (oil mist droplets having a diameter of approx. 5 mm) is measured by optical absorption. The measuring path consists of two infrared diodes, one of them working as a transmitter and the other one as a receiver. Oil mist passing between them absorbs some of the infrared light, thereby reducing the amount of light reaching the receiver. The selected unit of measurement is % opacity [%OP]; 0% opacity means zero, turbidity, 100% OP, however, total optical absorption.

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