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This paper presents information and test data, illustrating the importance of temperature as the fastest, most sensitive indicator of bearing condition in general and for the un-instrumented crank/connecting rod and crosshead bearings in particular. Parallels are drawn to the numerous studies recommendations and means of protection of stationary journal (main) bearings, most of all which are highly relevant for the non-stationary crankcase bearings of reciprocating machines, the crank and crosshead bearings. The subject of this paper covers a new technology, radar-wireless temperature sensors, instrumentation recently developed on the principle of a specialized radar excited surface acoustic wave (SAW) transducer, used in electronic highway toll collection systems (car tags), cell phone/appliance electromagnetic noise filters, etc. Therefore, the subject has nothing to do with the term “wireless” as widely used today – this is not telemetry nor wireless data collection/communication as currently known in general. Approved for hazardous areas, it consists of entirely passive components inside and around the machine. A brief introduction to the theory, applications and history of the new technology ispresented. The main section of the paper describes the applied technical solution for real-time temperature monitoring of non-stationary bearings. The principle of the underlying radar/SAW technology is presented followed by installation examples, drawings and photographs of permanent installations (in continuous operation since 2004 in North America, 2001 in Europe). The paper ends with conclusions from all the test data, numerous installations and “Users’ Views” feedback, including a case of prevented crankshaft damage.
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