DOOSAN O-WACS-100DI-5M Water in Oil Monitoring System

DOOSAN O-WACS-100DI-5M Water in Oil Monitoring System

The DOOSAN O-WACS-100DI-5M is a marine-grade inline water-in-oil (WIO) monitoring and transmitter system manufactured by Doosan Engine (now Hanwha Engine / formerly HSD Engine). Engineered specifically for continuous condition monitoring of two-stroke and four-stroke marine diesel propulsion engines, auxiliary engines, and large-scale reduction gearboxes, the O-WACS-100DI-5M monitors dissolved moisture levels by calculating Water Activity and oil temperature in real time.

This unit provides immediate alarm trip signals for water ingress caused by cylinder jacket leaks, plate-type lube oil cooler punctures, or centrifuge seal failures. The assembly features an inline stainless steel insertion probe, a 5-meter shielded marine connection cable (“-5M”), and an IP65/IP66 rated aluminum alloy display and signal processing transmitter enclosure equipped with local digital indication and discrete contact relays.

Model Details

• Model: O-WACS-100DI-5M
• System Family: O-WACS (Oil Water Activity Control & Sensing System)
• Manufacturer Part Number (MPN): O-WACS-100DI-5M / Ref. 126770
• Standard Cable Length: 5.0 meters (high-flex, oil-resistant, screened instrumentation cable)
• Engine Tag / Drawing Code: XS8150 (Water in Lub. Oil – Alarm / Slowdown Circuit)

Technical Details

Features

1. Integrated Pt100 RTD Temperature Transmitter: Houses an internal 100-ohm platinum resistance temperature detector for dynamic saturation-curve thermal compensation and oil temperature telemetry.
2. Independent Two-Stage Alarm & System Fault Relays: Integrated hardware circuits configure distinct volt-free contacts for Status, High Alarm, H-High Alarm (Engine Slowdown/Shutdown), and Fault fail-safe modes.
3. Local Digital Interface with LED Annunciation: Ruggedized backlit LCD panel displays numeric levels and temperature, backed by front-panel status LEDs for immediate visual confirmation inside noisy engine rooms.
4. Corrosion-Resistant In-Line Insertion Probe: Machined 316L stainless steel probe designed for direct tapping into main lubrication manifolds running continuous operational pressures up to 10 bar.

Applications

• Main Propulsion Engine Lube Oil: Installed on the main lube oil supply header (inlet manifold) of two-stroke MAN B&W and WinGD/Sulzer low-speed diesel engines.
• Auxiliary Diesel Generator Monitoring: Real-time oil sump loop protection on high-wear medium-speed marine generator sets.
• Marine Gearbox & Thruster Hubs: Continuous contamination tracking for main reduction gearboxes, controllable pitch propeller (CPP) hydraulic loops, and steerable azimuth thruster enclosures.
• Stern Tube & Deck Machinery Hydraulic Systems: Early indication of seawater seal degradation on stern tube lube loops and steering gear hydraulic power packs.

Part Number Cross-References

• Hanwha Engine: O-WACS-100DI-5M
• HSD Engine: O-WACS-100DI-5M / 126770
• Doosan Engine: O-WACS-100DI-10M (10-meter cable variant)
• Marine Engine Tag Identifier: XS8150 / WIO-TX-01

Compatibility

• Two-Stroke Marine Engines: Doosan / HSD / Hanwha-built MAN B&W (S50ME, S60ME, G70ME, S80ME, S90ME, MC-C platforms) and WinGD / Wärtsilä (X52, X62, X72, RTA, RT-flex series).
• Four-Stroke Generating Sets: HiMSEN (H21/32, H25/33), MAN 16/24, 21/31, 27/38, 32/40.
• Integrated Alarm & Monitoring Systems (AMS): Kongsberg K-Chief, AutoChief, NABRICO, Valmarine, Praxis, Siemens S7 Marine Automation, and standard marine PLC alarm panels.

Frequently Asked Questions

How do I clear an intermittent “Fault” LED indicator on the O-WACS panel?

A Fault LED illumination generally signifies a loss of continuity on the Pt100 RTD circuit, internal sensor element contamination, or power voltage dropping below 18V DC. First, verify that the 24V DC supply is stable under load. Next, inspect the multi-pin connector plug for oil penetration across the pins, and verify resistance across the RTD circuit (nominal ~107–120 Ω at normal operating temperatures). Clean the probe tip using an approved non-residue electronic solvent if contaminated.

Can the 4–20 mA output be tied directly into an existing Kongsberg or NABRICO AMS?

Yes. The O-WACS-100DI-5M provides two independent 4–20 mA active/passive configurable analog loops compatible with any standard marine Automation & Monitoring System (AMS) analog input module running an internal loop resistance up to 500 Ω.

Can I calibrate this unit onboard without sending it ashore?

Yes. In-situ field calibrations can be performed using calibrated saturated salt ampoules (e.g., 11.3% RH and 75.3% RH standards) and the internal calibration menu on the display module. However, for formal Class Renewal surveys (ABS, DNV, LR), a bench calibration certificate issued against traceable instrumentation is recommended.