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This paper reveals practical details in the application of the Southwest Research Institute designed Rod Load Monitor (RLM), for reciprocating compressors in the field, on line, and in operation. The RLM development was funded and directed by GMRC and is unique in that it is self-powered wireless technology measuring rod load directly on reciprocating machinery. The rod load measurement can be used to indicate horsepower and reversal. While the RLM can operate on a variety of reciprocating machines, this paper is confined to reciprocating compressors. The rod load measurement is accomplished with strain gages mounted directly on the compressor rod. The strain signal is amplified and transmitted from a single moving module is generated with a built in, moving linear alternator and stationary magnetic array. Field testing has already begun with some success and some new challenges. The linear alternator on long stroke, slow speed (250 RPM) compressors may need modification or power reduction incorporated in the amplifier transmitter and/or the strain gates. The paper will be based on test results conducted and witnessed by the authors over the Spring and Summer.
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