Function overview:

The day- to-day mission of Schaller & Engine Protection Partner is to detect potentially harmful operating conditions in which hazardous oil mist is released as a result of bearing damage. In extreme cases, these oil mists which consist of tiny oil particles have a tendency to cause an explosion in the crankcase of the engine- Schaller oil mist detection systems represent the last reliable safeguard against such accident.

Flexibility, simplicity and reliability – this is how we control your operating cost more effectively! The engine wall screw fitting allows the sensor to be mounted on the engine and also the intake and return of the crankcase atmosphere.

The engine wall screw fitting with is flexible intake funnel is mounted from the outside. Its form prevents splash oil from being drawn in and a false alarm being triggered. We can offer you s suitable engine wall screw fitting to match the engine wall thickness.

The central unit of the VN301plus system has the following functions:

• Disturbing power supply to the sensors
• Providing the operator with necessary information on system status
• Programming and adjustment

The central unit is designs to withstand extreme conditions such as vibrations or high temperature at the engine. All important information is available at a glance. Up to 10 sensor can be connected to the central unit , and up to 20 as master slave version.

Our new software makes it possible to calibrate the sensors so they are always perfectly adjusted to the engine operating conditions. Our tried and tested “floating zero algorithm” adapts to the opacity in the crankcase arising from the operation conditions and therefore prevents false alarms.

The Remote Indicator II can be connected as an option.

The central unit can communicate with modern control systems via ModBus or CAN bus. All data in the system is stored in the central unit for analysis.

The new VN2020 Oil Mist Detector will be available during 2019! The VN2020 replaces the VN115/87plus and VN116/87plus. The VN2020 will be especially for 4- stroke engine marked. The VN301plus replaces VN215/87plus for the 2- stoke marked!

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.

VN/87plus Re- Design to VN2020

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.

VISATRON VN 116 series as compared to the VN 115 series, is more sensitive because it has an additional differential alarm level. It compares the oil mist concentration from each side of the heeder-suction- tube section and responds if there is a difference, this being a sure sign for 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.

The microprocessor saves both opacity values and executes the opacity comparison (damage check). In-home position both valves are open. They only become operative if the compound opacity from both header-suction-tube sections exceeds the sensitive threshold for starting the damage check. This will trip an alarm if the decisive differential alarm level is being exceeded. At the same time, it is indicated in which compartment group the damage has occurred.

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 a 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. In contrast to the type VN 116 series, a search run will be continued. By closing the valves of certain compartment groups according to an iteration procedure and by an opacity comparison, the single-suction line can finally be determined which is supplied with oil mist from the compartment in which the overheating damage has occurred. For damage indication on the detector, the position of the valve which is still left open is used for indicating the damaged compartment.

The Visatron pressure regulator is an important part combined with the oil mist detector. The device secures a safe operation of the airflow supplied to the oil mist detector. The system is build up with a safety unit that secures the airflow not to pass over max. 90,00 mm WC. The system also provides clean air to the oil mist detector threw the filter system. The pressure reducer is used for all VISATRON oil mist detectors.

Benefits:

• The pressure reducer secures stabile and clean air to the oil mist detector
• Air filter installed in the safety unit
• Solid construction with long life time
• Complete repair/ maintenance kit available

Repair kit for pressure reducer. P/n.: 11068, contains following parts:

• 1 x The complete adjusting device incl. adjustment screw
• 1 x Filter for pressure reducer. P/n: 10002
• 1 x O- ring for bronze filter screw. P/n: 10003
• 1 x O- ring for throttle set screw. P/n: 10004
• 1 x O- ring for throttle set screw- small. P/n: 10679

The digital u- tube manometer is easy to use for checking the negative pressure in your oil mist detector. The digital u- tube manometer shows the value in mmH2O- the same as mmWC. Recommended pressure is 60,00 mmWC/ mmH2O.

Benefits:

• Easy to use
• Do not require water to be filled in
• Solid construction with long life time
• Accurately and measuring

How to use:

1. Before starting the procedure- stop the engine! Turn off the air pressure on the pressure regulator unit.
2. Unscrew the plug (part no. 10083) on the inspection cover located on the measuring head. Install the quick connection (part no. 10053.),
3. Press on the digital u- tube manometer- then 0,0 mmH2O will be indicated in the display.
4. Press in the main connection into the quick connection, and start to adjust the adjusting screw on the pressure reducer until the display show 60,00 mmH2O on the digital u- tube manometer.
5. When this is done, disconnect the digital manometer from the oil mist detector- the negative pressure is now adjusted.

Not all engines allow installations where the main tube has recommended 2- 4 % angel. The reason why we recommend the 2- 4 % angel on the main tube is based that collected oil inside the tubing system is drained back to the crankcase. The syphon blocks are specially made for oil mist detector installations where the main tubes are installed in horizontal position. The syphon blocks are designed to let the oil mist go through the pipe system and let the oil and oil droplets be drained back to the crankcase. The design makes the installation of pipes quick and easy.

Benefits:

• Easy installation
• No need for main pipes system with 2- 4 % angel
• Easy to maintenance

In case of a non-optimal driving air quality to the oil mist detector, the driving air conditioning kit (P/n: 272213) may help you get rid of failing to measure heads, being activated eg. by failure LED no. 14- negative pressure/ airflow too low. The water separator device eliminates the risk of water making technical problems inside the pressure reducer, measuring head and the ejector pump. The system is specially made to rise up the air quality to a high stabile level.

Benefits:

• For longer lasting fresh air filter/ scavenging air filter (P/n: 10042) lifetime
• Makes independ of onboard air quality
• Automatic de- oiling/ watering system as option

Technical overview/description of device:

1. Flexible tube for connection to inlet compressed air
2. Draining for water/ oil
3. Protection cover. P/n: 10753**
4. Connection pipe between separator unit and pressure reducer. P/n: 10001
5. Separator device
6. Pressure reducer. P/n: 10001**

The remote indicator II allows the safe remote monitoring of the oil mist concentration from outside the engine room e.g. from the engine control room.

In use with a VN93 or VN87plus, it is possible to monitor the relative opacity and the state of one OMD device similar to the OMD display. The connection to the VN/93 and VN/87plus units is realized by an RS485 two-wire bus.

Optional the remote indicator II can be connected to a VN87-EMC unit. This connection to theVN/87-EMC is realized as a two-wire analog interface. If a VN/87-EMC is connected to the remote indicator II, the device monitors only the oil mist concentration and not the state of the OMD device.

Benefits:

• Full overview of “real-time” measurement of oil mist concentration
• Secures personnel’s situation in cases of high oil mist alarm
• Meet’s the IACS UR 10.11 requirement
• Easy to install