Graviner MK6 / MK7 Oil Mist Detection

Crankcase oil-mist detection systems for marine diesel engines — SOLAS-required protection for newbuildings and retrofit projects.

Browse all spare parts Oil mist detectors category

Product line

Two proven systems. One safety standard.

Graviner MK6 and MK7 continuously monitor oil-mist concentration in the crankcases of main engines, auxiliary engines and diesel generators. When concentration rises toward dangerous levels, the system provides early alarm and can support slow-down / shut-down protection — helping prevent crankcase explosion and major vessel loss.

Brand & manufacturing origin

Graviner is a premium Carrier Group brand. Complete manufacturing is based in Poland, with no China OEM production for Graviner units. With more than 50 years in marine crankcase oil-mist detection, Graviner is widely recognized as a global benchmark for engine safety monitoring. Jenzon Tech supplies original Graviner hardware with clear Poland origin and China re-export transit documentation.

Classic · largest installed base

Graviner MK6

The field-proven classic for commercial fleets. Direct-mount probes remove sampling-pipe design, cutting installation work and routine maintenance. Modular distributed architecture supports up to 64 probes across as many as 8 engines, with fast scanning response for multi-engine arrangements.

Optical scattering measurement with low false-alarm rate
Probe self-diagnosis; faulty probe isolated without stopping the whole system
IP65 protection for high temperature, vibration and salt-fog engine rooms
No sampling pipe — direct-mount probes simplify install and service
Class certificates: DNV, LR, BV, KR, NK, CCS; aligned with IACS M67 / M10

View MK6 details Request Quote

Digital upgrade · touch display

Graviner MK7

The next-generation digital version inherits MK6 reliability and adds auto-address communication, colour touch display and deeper diagnostics. Scale up to 10 control units and 100 probes — suited to large multi-engine vessels and modern engine control rooms that need live values, alarm history and permanent fault records.

7.5-inch colour touch display for engine control room visibility
24-hour automatic self-check with permanent fault-log storage
PC software for flexible alarm-threshold configuration
Auto-address digital communication for large multi-engine layouts
Compatible configuration paths for MAN, Wärtsilä and Caterpillar engines

View MK7 details Request Quote

What the system protects

Excessive crankcase oil mist is a recognized precursor to crankcase explosion. Continuous monitoring gives crews earlier visibility, supports protective engine responses, and helps vessels stay ready for PSC inspection at international ports.

Why shipowners stay with Graviner

Graviner is not positioned as a low-price substitute. Selection is driven by safety performance, class compliance and life-cycle cost — including false-alarm risk, onboard serviceability and stable spare-part demand across a large existing vessel base.

Decades of real-world operation on thousands of commercial vessels
Full mainstream class certificates to support worldwide PSC acceptance
Low false-alarm behaviour under salt-fog and vibration — false trips cost ship time
Modular spares: crew can replace a defective probe without waiting for a boarding engineer
Large in-service fleet sustains long-term MK6 / MK7 hardware and spare demand