VISATRON VN93 Oil Mist Detector (OMD)

Manufacturer

Schaller Automation GmbH & Co. KG

Country of Origin

Germany

Product Type

Oil Mist Detector (OMD)

Marine Application

Main Engine Crankcase Monitoring & Explosion Protection System

---

Product Introduction

The VISATRON VN93 Oil Mist Detector (OMD) is one of the most trusted crankcase monitoring systems used on marine diesel engines worldwide. Developed by Schaller Automation Germany, the VN93 continuously monitors oil mist concentration inside engine crankcases and provides early warning of potentially dangerous engine conditions.

Oil mist formation inside a crankcase is often the first indication of overheating bearings, insufficient lubrication, excessive friction, or internal mechanical damage. If these conditions remain undetected, they may result in a crankcase explosion, severe engine damage, costly repairs, and vessel downtime.

The VISATRON VN93 provides continuous protection by monitoring each crankcase compartment and generating alarms whenever oil mist concentration exceeds safe operating limits.

Original Product Image

---

What Is This Equipment?

An Oil Mist Detector (OMD) is a mandatory safety system installed on large marine diesel engines.

The purpose of the system is to continuously sample air from crankcase compartments and measure oil mist concentration using optical technology.

When abnormal oil mist levels are detected, the system:

• Activates visual alarms
• Activates audible alarms
• Identifies the affected compartment
• Warns engine personnel
• Helps prevent crankcase explosions

Today, most classification societies require approved oil mist detection systems for medium and large marine diesel engines.

---

How VISATRON VN93 Works

The VN93 uses a fully automatic sampling principle.

Air samples are continuously drawn from crankcase compartments through sampling pipes connected to the VISATRON Valve Box.

The monitoring unit analyzes the oil mist concentration using optical measuring technology. When oil mist concentration rises above the preset alarm limit, the system immediately activates alarm outputs and identifies the affected cylinder section.

This early warning enables engineers to take corrective action before dangerous conditions develop.

System Operation Images

---

Main Features

Continuous Crankcase Monitoring

Provides 24-hour monitoring of engine crankcase conditions.

Early Warning Protection

Detects abnormal oil mist formation before severe damage occurs.

Cylinder Identification

Identifies the crankcase compartment generating the alarm.

Optical Measuring Technology

Provides accurate and reliable oil mist detection.

Fully Automatic Operation

No manual sampling is required during normal operation.

Classification Society Approved

Accepted by major marine classification societies worldwide.

Proven German Reliability

Installed on thousands of vessels globally.

---

Main Components

The VISATRON VN93 system consists of several important components.

1. Monitoring Unit

The central processing and alarm unit.

Functions

• Oil mist measurement
• Alarm processing
• Data analysis
• System diagnostics

---

2. Valve Box VN215/93

Controls sequential sampling from crankcase compartments.

Functions

• Sample selection
• Air distribution
• Cylinder identification

---

3. Sampling Pipe System

Connects engine crankcase compartments to the monitoring system.

Functions

• Air transport
• Mist sampling

---

4. Optical Measuring Chamber

The heart of the system.

Functions

• Oil mist detection
• Optical analysis

---

5. Alarm Interface Module

Provides alarm outputs to engine monitoring systems.

Functions

• Audible alarm activation
• Visual alarm activation
• Shutdown interface

Component Images

---

Marine Applications

The VISATRON VN93 is commonly installed on:

Main Engines

• MAN B&W Engines
• Wärtsilä Engines
• Sulzer Engines
• Mitsubishi Marine Engines

Auxiliary Engines

• Generator Engines
• Auxiliary Diesel Engines

Vessel Types

• Container Ships
• Bulk Carriers
• Oil Tankers
• Chemical Tankers
• LNG Carriers
• Offshore Vessels
• Ro-Ro Vessels

The VN93 is considered a critical engine safety system onboard these vessels.

---

Available Stock From SM MARINE SERVICE™

SM MARINE SERVICE™ supplies VISATRON VN93 systems in:

• Used Condition
• Refurbished Condition
• Reconditioned Condition

All available units can be tested prior to delivery, subject to stock availability.

Stock & Installation Images

---

Common Alarm Codes

Typical VISATRON VN93 alarms include:

E001

Ambient temperature too high

E002

Ambient temperature too low

E003

Sensor contamination detected

E004

Communication fault

E005

Valve box fault

E006

Optical sensor error

E007

Sampling fault

E008

Internal electronics fault

Oil Mist Alarm

Oil mist concentration exceeds permissible level.

---

Common Problems & Troubleshooting

High Oil Mist Alarm

Possible Causes

• Bearing overheating
• Lubrication failure
• Excessive friction
• Mechanical damage

Corrective Actions

• Reduce engine load
• Inspect bearing temperatures
• Check lubrication system
• Follow engine maker instructions

---

Valve Box Failure

Possible Causes

• Blocked sampling lines
• Valve mechanism fault
• Internal contamination

Corrective Actions

• Clean sampling lines
• Inspect valve mechanism
• Verify valve operation

---

Sensor Contamination

Possible Causes

• Oil deposits
• Dirt accumulation

Corrective Actions

• Clean optical chamber
• Perform maintenance inspection

---

Communication Alarm

Possible Causes

• Wiring fault
• Connector damage
• Internal electronics problem

Corrective Actions

• Check wiring
• Inspect connectors
• Verify power supply

---

False Alarms

Possible Causes

• Calibration drift
• Dirty sensor
• Sampling leakage

Corrective Actions

• Verify calibration
• Clean sensor
• Check pipe integrity

---

Maintenance Tips

Daily Checks

• Verify normal system operation
• Check alarm status

Weekly Checks

• Inspect sampling lines
• Verify valve box operation

Monthly Checks

• Test alarm functions
• Inspect optical sensor condition

Quarterly Maintenance

• Clean optical chamber
• Check electrical connections

Annual Maintenance

• Complete functional testing
• Calibration verification
• Replace worn components

Proper maintenance significantly increases system reliability and service life.

Maintenance & Service Images

---

Why Ships Still Use VISATRON VN93

The VISATRON VN93 remains one of the most popular oil mist detectors because:

• Proven German engineering
• Reliable crankcase monitoring
• Fast alarm response
• Simple maintenance
• Worldwide spare parts availability
• Long operational life
• Excellent safety record
• Compliance with international marine regulations

Many vessels continue operating VN93 systems successfully for decades with proper maintenance.

---

Frequently Asked Questions (FAQ)

What is the purpose of VISATRON VN93?

The VN93 continuously monitors oil mist concentration inside marine diesel engine crankcases and provides early warning of dangerous engine conditions.

Why is oil mist monitoring important?

Oil mist accumulation can lead to crankcase explosions and catastrophic engine damage.

Can the VN93 identify the affected compartment?

Yes. The system identifies the crankcase compartment causing the alarm.

Is VISATRON VN93 class approved?

Yes. It is approved by major marine classification societies.

Does VISATRON VN93 require calibration?

Periodic verification and maintenance are recommended according to manufacturer requirements.

---

Short Product Description

The VISATRON VN93 Oil Mist Detector (OMD) from Schaller Automation Germany is an advanced crankcase monitoring and protection system designed for marine diesel engines. The system continuously measures oil mist concentration, provides early warning of abnormal engine conditions, and helps prevent crankcase explosions. Its proven reliability, robust design, and worldwide acceptance make it one of the most trusted OMD systems in the marine industry.

---

Assembly Details

Complete System Assembly Includes

1. VISATRON VN93 Monitoring Unit

• Optical measuring module
• Display module
• Alarm module

2. VN215/93 Valve Box

• Sampling valve assembly
• Cylinder selection mechanism

3. Sampling Pipe Network

• Crankcase sampling lines
• Air transport system

4. Optical Sensor Assembly

• Measuring chamber
• Detection optics

5. Alarm Output Module

• Alarm relays
• Monitoring outputs

6. Power Supply Module

• Internal power regulation
• Protection circuits

7. Communication Interface

• External monitoring connections
• Alarm integration

8. Mounting Hardware

• Brackets
• Fasteners
• Installation accessories

SM MARINE SERVICE™

Marine Automation & Navigation Equipment Supplier

Available Condition:

• New Equipment
• Used Equipment
• Refurbished Equipment
• Reconditioned Equipment

Stock Location:

• Bangladesh
• China

Services:

• Worldwide Shipping
• Technical Support
• Spare Parts Supply
• Marine Equipment Sourcing

Contact Information

SM MARINE SERVICE™
Samir Market, DT Road, Pahartali, beside CDA Market, Chattogram, Bangladesh

Mobile / WhatsApp / Viber: +88 01818 929292

Email: info@smmarineservice.com

Website: www.smmarineservice.com

-

+

Buy Now