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Lehmann & Michels GmbH
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D-25462 Rellingen
Tel: +49 4101 5880 0
Fax: +49 4101 5880 129

AMOT XTS-W+

BEARING WEAR MONITORING SYSTEM

Monitors condition of crank train bearings in large 2-stroke diesel engines
Monitors Bearing Wear (BWM)
Integrated water in oil (WIO) monitoring
Protection within 30 minutes of engine start-up
Can remove need for open-up inspection

The XTS-W+ Bearing Condition Monitor from AMOT provides advanced warning of wear in crank train bearings of 2-stroke slow speed diesel engines.

The XTS-W continually monitors the condition of the bearing, offering an intuitive and reliable definitive measuring device. The full life potential of the bearing can be assessed and in-service time maximised. Easily installed with no drilling of highly stressed engine components, the XTS-W+ is suitable for both new build installations and retrofitting to existing engines.

It can indicate wear in the following areas:

main bearings
crank-pin bearings
cross head bearings

and may be used in applications using plain bearings, such as

large 2-stroke
marine engines
large reciprocating compressors

The XTS-W is Type Approved by Lloyd’s Register, American Bureau of Shipping and Bureau Veritas. The technology developed by AMOT is a valuable component of the condition based maintenance programmes provided by Classification Societies.

Water in oil

The new generation XTS-W has fully integrated water-in-oil (WIO) monitoring.
Separate screens show trends, real-time measurement of Water Activity (aw) and Parts Per Million (ppm). Alarm levels are as defined by engine manufacturers.
The sensor is installed in the main lube oil line
at the inlet to the engine
There are 2 alarm set points as shown below
In addition full trend data is available as standard allowing interrogation of the system to determine rate of water contamination.

Engine condition	Abs water content %	Water activity (aw)
Normal running	0 - 0.2 (0-2000 ppm)	0 - 0.7 (0-70%)
First alarm level	0.3 (3000 ppm)	0.8 (80%)
Second alarm level	0.5 (5000 ppm)	0.95 (95%)

Humidity measurement in oil

Similar to the humidity in the air, the water content in oil can be indicated by the absolute value in ppm or by the relative value aw:

ppm (mass of water / mass of oil)
aw (actual water content as a fraction of the water content in saturated oil)
aw = 0 corresponds to water-free oil
aw = 1 indicates saturated oil (displayed as 0-100% on XTS-W)

Display and monitor unit

The Display and Monitor Unit comprises application-specific software that runs on a marine approved PC. This unit provides:

Wear trend and prediction capability Alarm/warning indication Continuous bearing wear status Water in oil activity The use of proximity sensing and the avail- ability of signal post-processing enables real-time wear trend analysis. Through analysis of the rate of change of the bearing condition it provides much earlier indication of potential bearing problems.
	Screen under alarm conditions


Trend lines using data from selected sensors	Water-in-oil displaying water activity (aW), parts per million (ppm) and lubrication oil temperature

Download PDF Overview AMOT XTS-W

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