Daihatsu MD-SX Oil Mist Detector Controller | Marine Crankcase Oil Mist Detection System | Daihatsu Diesel Engine Safety Equipment

Posted onJune 13, 2026

Daihatsu MD-SX Controller Oil Mist Detector (OMD) – Complete Marine Technical Guide

Manufacturer

Daihatsu Diesel Mfg. Co., Ltd.

Country of Origin

Japan

Product Type

Marine Oil Mist Detector (OMD) System

Marine Application

Crankcase Oil Mist Monitoring and Main Engine Safety Protection

The Daihatsu MD-SX Oil Mist Detector (OMD) is an advanced marine engine safety system specifically designed to continuously monitor oil mist concentration inside diesel engine crankcases.

The system helps prevent dangerous crankcase explosions by providing early warning alarms whenever abnormal oil mist concentrations develop inside engine compartments.

The MD-SX system is widely installed on:

Daihatsu Auxiliary Engines
Main Propulsion Engines
Marine Diesel Generators
Offshore Power Units
Merchant Vessels
Tankers
Bulk Carriers
Container Ships

Original Daihatsu MD-SX Oil Mist Detector System

The image above shows an actual Daihatsu MD-SX Controller with Multiple Oil Mist Sensors supplied by SM MARINE SERVICE™.

Product Introduction

Crankcase explosions remain one of the most dangerous risks in marine diesel engines.

Before an explosion occurs, overheating bearings or damaged engine components generate microscopic oil particles known as oil mist.

The Daihatsu MD-SX system continuously samples crankcase conditions and provides immediate alarms before dangerous oil mist levels reach explosive concentrations.

This early warning allows engineers to investigate engine conditions before major damage occurs.

Typical Oil Mist Detection System

What Is the Daihatsu MD-SX Oil Mist Detector?

The MD-SX is a multi-point oil mist detection system consisting of:

Central Controller Unit
Oil Mist Sensors
Sampling Probes
Alarm System
Communication Circuits

The controller continuously receives signals from multiple crankcase sensors and displays oil mist concentration levels for each engine cylinder or monitoring point.

Whenever oil mist concentration rises above preset limits, the system activates alarms and safety outputs.

Main Features

Continuous Crankcase Monitoring

Provides real-time oil mist measurements.

Multi-Sensor Capability

Monitors multiple engine locations simultaneously.

Early Warning Protection

Detects abnormal conditions before severe damage occurs.

LCD Display Monitoring

Displays sensor status and alarm information.

Individual Sensor Identification

Pinpoints affected engine zones.

Alarm and Shutdown Outputs

Interfaces with vessel automation systems.

Self-Diagnostic Functions

Continuously checks system health.

Marine Approved Design

Suitable for demanding marine environments.

Oil Mist Sensors and Controller Components

Working Principle

The MD-SX system operates using optical oil mist measurement technology.

Step 1

Oil mist sensors continuously sample air from engine crankcase spaces.

Step 2

The sensor measures suspended oil particles.

Step 3

Oil mist concentration is converted into electrical signals.

Step 4

Signals are transmitted to the MD-SX controller.

Step 5

The controller compares measured values with alarm thresholds.

Step 6

If abnormal levels are detected, alarms are activated.

Step 7

Operators investigate engine conditions before dangerous situations develop.

Main Components

1. MD-SX Controller

The central processing unit.

Functions

Alarm processing
Sensor monitoring
System diagnostics
Event display

2. Oil Mist Sensors

Installed at various crankcase monitoring points.

Functions

Air sampling
Oil mist measurement
Signal transmission

3. Communication Network

Connects sensors to controller.

Functions

Data transmission
System communication

4. Alarm Outputs

Interfaces with ship automation systems.

Functions

Warning alarms
Shutdown signals
Remote indications

5. Power Supply Module

Provides stable operating voltage.

Marine Applications

The MD-SX system is used on:

Main Diesel Engines

Crankcase protection.

Auxiliary Diesel Engines

Generator engine safety monitoring.

Offshore Power Units

Continuous oil mist supervision.

Marine Power Plants

Engine protection systems.

Tankers and Cargo Vessels

Compliance with safety regulations.

Typical Shipboard Installation

Common Alarms and Troubleshooting

High Oil Mist Alarm

Causes

Bearing overheating
Lubrication failure
Excessive friction

Corrective Action

Reduce engine load
Inspect bearings
Check lubrication system

Sensor Failure Alarm

Causes

Faulty sensor
Wiring issue
Communication failure

Corrective Action

Check sensor connections
Replace defective sensor
Verify communication network

System Failure Alarm

Causes

Controller malfunction
Power supply problem
Internal circuit failure

Corrective Action

Verify power supply
Inspect controller
Perform diagnostic testing

Communication Error

Causes

Damaged cable
Loose terminals
Sensor network fault

Corrective Action

Check communication lines
Tighten terminals
Replace damaged wiring

Maintenance Recommendations

Weekly

Verify normal system status
Check alarm indications

Monthly

Inspect sensor wiring
Test alarm functionality

Quarterly

Clean sensor assemblies
Verify sensor response

Annually

Full calibration
Functional testing
System diagnostics
Sensor replacement if required

Maintenance and Calibration

Why Ships Still Use the Daihatsu MD-SX

The MD-SX remains popular because of:

Proven reliability
Accurate oil mist detection
Early warning capability
Long service life
Easy maintenance
Availability of spare parts
Excellent safety record
Strong marine industry acceptance

Many vessels continue operating MD-SX systems for decades with proper maintenance.

Frequently Asked Questions (FAQ)

What does the MD-SX detect?

It detects oil mist concentration inside diesel engine crankcases.

Why is oil mist monitoring important?

Oil mist can indicate bearing overheating and potential crankcase explosion risks.

Can the MD-SX prevent engine damage?

It provides early warnings that allow engineers to take corrective action before major failures occur.

How many sensors can be connected?

The number depends on the engine configuration and controller version.

Does the system require calibration?

Yes. Regular calibration is recommended for accurate operation.

Assembly Details

A complete Daihatsu MD-SX Oil Mist Detector system generally includes:

Standard Assembly

MD-SX Controller Unit
Oil Mist Sensors
Sensor Sampling Heads
Communication Cables
Alarm Interface Module
Power Supply Module
Mounting Accessories
Installation Hardware

Optional Components

Spare Sensors
Calibration Kit
Communication Modules
Remote Alarm Units
Replacement Cable Sets

Short Product Description

The Daihatsu MD-SX Oil Mist Detector is a marine engine protection system designed to continuously monitor crankcase oil mist concentrations and provide early warning alarms. The system helps prevent crankcase explosions, protects engine components, and improves operational safety onboard ships.

Daihatsu MD-SX Operation Manual
MD-SX Installation Manual
MD-SX User Guide
Controller Configuration Guide

Maintenance Manual

Available Resources:

Maintenance Procedures
Calibration Instructions
Sensor Replacement Guide
Troubleshooting Manual
Spare Parts Catalogue
Wiring Diagram Manual
Service Documentation

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

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