Schaller Visatron VN 215/87 plus Oil Mist Detector (OMD)

Schaller Visatron VN 215/87 plus Oil Mist Detector (OMD) — a classic, widely used model in marine and industrial applications for large reciprocating engines.

📌 What is it?

The Schaller Visatron VN 215/87 Plus is an Oil Mist Detector used for continuous monitoring of the crankcase atmosphere in large diesel engines. It detects the presence of oil mist which can be an early indicator of bearing failure or overheating, preventing crankcase explosions.

📊 Key Components Visible:

1. Measuring Head (top)

   • Draws air samples from the crankcase.

   • Optical measuring cell inside measures light absorption caused by oil mist particles.

   • The small red LED indicates alarm or status.

2. Indicator Bank (middle section)

   • Numbered sampling points (1–8 or 1–6 depending on the engine size).

   • Each corresponds to a crankcase sampling point.

   • The slots visually show the mist level or which point is alarming.

3. Reset/Control Unit (bottom)

   • A reset button and connections for signal and power.

📌 How it Works:

• Air is continuously sampled from various crankcase points.

• The measuring head detects oil mist concentration by measuring light absorption.

• If any point exceeds a preset limit, an alarm is triggered, and signals can automatically shut down the engine.

• It’s typically integrated with ship alarm monitoring systems and safety shutdown circuits.

📦 Manufacturer:

Schaller Automation (Germany) — highly reputable in marine engine safety devices.