The Schaller Automation Visatron VN/87plus generation consist of: VN 115/87plus, VN 116/87plus & VN 215/87plus. The VN87plus is the successor of the VN/87 EMC. The VN/87plus was placed into the market in 2008. It was in production until the system was replaced by VN2020 and VN301plus in 2020. The VN/87plus was mainly used for 4-stroke engine market, and the system requires a single tube installation. The VN 116/87plus and VN 215/87plus was mainly used for the 2-stroke engine market. The VN 215/87plus indicates during a high oil mist concentration alarm which compartment the oil mist is coming from. The VN 116/87plus indicates from what side, the oil mist concentration is coming from. The VN 115/87plus is during a high oil mist concentration alarm, indicates that there is oil mist concentration in engine. The VN 115/87plus does this without any compartment location of the oil mist.

VN 115/87plus

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.

VN 116/87plus

It compares oil mist concentration from each side of the header-suction-tube section and responds if there is a difference. This being a sure sign for an overheating damage in the compartment group with the higher opacity. The differential alarm level is carried along with regard to its sensitivity relating to the 10-stage adjustment of the alarm level which is also available for VN 115. For measuring the opacity differential, the sample flows of both header-suction-tube sections are fed to the turbid metric channel one after the other by closing the respective tube sections alternately by means of reed valves.

VN 215/87plus

VISATRON VN215/87plus, operates in the same way as the VN 116/87plus as far as the tripping of an alarm is concerned. However, it is able to additionally indicate the suction point with the highest opacity and thus the compartment in which the overheating damage has occurred. Unlike the other types, the VN 215 series has a single-suction-tube system, each compartment being connected by a separate tube to valve box designed for 10 suction lines. All procedures are similar to those of type VN 116 series. Normally, the compound opacity of the oil mist from all compartments will continuously be measured. If the opacity exceeds the damage check starting threshold a damage check will be executed. lf the differential alarm level is exceeded, an alarm causing the automatic stop of the machine or a speed reduction will immediately be tripped.

The post Visatron VN/87plus appeared first on Engine Protection Partner AS.

In 2020 Schaller Automation released a new oil mist detector, the Visatron VN2020. Acting as a successor to the VN115 and VN116 lines of models, it improves many aspects of what made the VN115 and VN116 series great. The VN2020 will be especially for 4- stroke engine marked. The VN301plus replaces VN215/87plus for the 2- stoke marked!

How does the Visatron VN2020 work?

Visatron VN2020 continuously and simultaneously evacuate crankcase atmosphere from each crankcase compartment between two main bearings. The VN2020 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.

Upgrades

Here are some of the key upgrades that has been made to the Visatron VN2020 OMD:

• Integrated pressure regulator including water separator
• Can be delivered with ATEX/ IECEx standard
• New designed LED panel on measuring head with separate displays for safe reading during operation
• New connection box instead of connection socket used on VN/87plus generation
• New position of Wire Break Resistors inn connection box
• RESET button position directly on measuring head
• Latest SMD component and  pressure sensor technology used in measuring head
• No need for scavenging air filters on VN2020- less spare parts required!
• Negative pressure to be read out directly on measuring head display- no need for u- tube manometer!
• CANopen and MODBUS RTU signals!
• New replaceable main cable between measuring head and connection box!

The post Visatron VN2020 Oil Mist Detector System appeared first on Engine Protection Partner AS.