SPECS Vision-IIIR Oil Mist Detector

SPECS Oil Mist Detector Vision-IIIR

The SPECS Vision-IIIR is an optical scatter-type Oil Mist Detector (OMD) engineered for continuous crankcase atmosphere monitoring on large two-stroke crosshead and four-stroke trunk-piston marine diesel engines. Manufactured by SPECS (Samsung Precision Engineering & Control Systems), the Vision-IIIR evaluates real-time oil mist concentration across individual engine crankcases to prevent catastrophic crankcase explosions caused by bearing overheating, piston blow-by, or liner scuffing.

Model Details:

• Manufacturer: SPECS Co., Ltd.
• Model Series: Vision-IIIR (Third-Generation Retrofittable Optical OMD)
• Manufacturer Part Number (MPN): VISION-IIIR / VISION-3R-STD (Standard Main Control & Sensor Architecture)
• Detection Principle: Infrared Optical Light Scattering (940 nm LED emitter / silicon photodiode receiver)

SPECS Vision-IIIR Technical Specifications

Features

1. Direct Crankcase Mounting: Eliminates long, heated sampling pipe networks, preventing oil condensation blockages and reducing detection latency to under 2 seconds.
2. Dual-Loop Redundant Bus: Sensor heads communicate via a fault-tolerant, closed-loop CAN-Bus architecture; a single open circuit or wire break does not interrupt communication with remaining cylinder heads.
3. Active Optical Compensation: Built-in automatic dirt compensation monitors LED degradation and lens contamination, triggering a dedicated System Fault relay before measurement accuracy drifts.
4. Plug-and-Play Retrofit Architecture: Engineered with standardized mechanical mounting flanges and electrical footprints to replace legacy Graviner, Schaller, and older SPECS Vision-I/II units with minimal hot-work.
5. Non-Volatile Event Logging: Stores the last 500 alarm, fault, and calibration events with time-stamped cylinder-specific mist concentration levels for Classification Society survey audits.

Compatible Marine Diesel Engines

• MAN B&W (2-Stroke): MC, MC-C, ME, ME-B, and ME-C series (S35MC to K98MC-C / G95ME-C)
• Wärtsilä / Sulzer (2-Stroke & 4-Stroke): RTA, RT-flex, X-series, Wärtsilä 32, 38, 46, and 46F
• Hyundai-HiMSEN (4-Stroke): H21/32, H25/33, H32/40, and H35/40V auxiliary and propulsion engines
• Yanmar & Daihatsu (4-Stroke Auxiliary): EY26, EY33, DK-20, DK-26, and DC-17 series
• Caterpillar / MaK: M20, M25, M32, and M43C marine propulsion engines

Part Number Cross-References

• SPECS Vision-IIIR Main Display / Control Unit: V3R-MCU-24D / VISION-IIIR-DISP
• SPECS Vision-IIIR Optical Detector Head: V3R-SH-01 / OPD-3R
• SPECS Vision-IIIR Scavenge Air / Pressure Reducer Flange: V3R-FLG-STD
• Legacy System Upgrade Equivalents: Direct functional replacement for SPECS Vision-II (V2-MCU), Schaller Visatron VN 215/87 Plus (via adapter flange kit), and Kidde-Graviner Mk6 / Mk7 systems.

Frequently Asked Questions

Can a single SPECS Vision-IIIR sensor head be replaced without recalibrating the entire engine system?

Yes. Each Vision-IIIR optical sensor head stores its factory zero-point and span calibration data internally. When replacing a damaged sensor head, assign its cylinder address via the rotary dip switches on the sensor PCB to match the previous unit, connect it to the CAN-Bus loop, and the Main Control Unit will automatically recognize and poll the replacement head.

Is the SPECS Vision-IIIR backward compatible with older SPECS Vision-II wiring?

The Vision-IIIR uses a 4-wire shielded CAN-Bus loop (CAN-H, CAN-L, +24V, 0V) between the engine junction box and the Main Control Unit. If your existing Vision-II installation uses a 4-core twisted-pair shielded marine cable in good condition, the existing cable run can be reused, though both the Main Control Unit and the individual sensor heads must be upgraded together as Vision-II and Vision-IIIR sensor protocols are not mix-and-match compatible on the same loop.

How is the SPECS Vision-IIIR tested during annual Classification Society surveys?

During annual Class surveys, technicians perform a functional loop test using an approved aerosol test mist or optical test filter inserted into the sensor chamber. The system must register a rising mg/L reading on the local LCD display, trigger the Pre-Alarm relay, and activate the High Alarm / Engine Slowdown relay within the specified response window while logging the event in memory.

What causes a persistent “System Fault” or “Sensor Contamination” alarm on the Vision-IIIR?

A persistent fault typically indicates either heavy carbon/oil buildup on the internal optical emitter lens, a missing 120-Ohm termination resistor on the CAN-Bus loop, or a supply voltage drop below 18 V DC during engine maneuvering. Cleaning the optical chamber with isopropyl alcohol and verifying terminal block voltages at TB1 and TB2 resolves most field faults.