{"product_id":"bently-nevada-3500-72-03-cn-3500-72m-recip-rod-position-monitor","title":"Bently Nevada 3500\/72-03-CN 3500\/72M Recip Rod Position Monitor","description":"\u003ch3\u003eProduct Overview\u003c\/h3\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e3500\/72-03-CN\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e(3500\/72M) is a high-performance, 4-channel monitor specifically designed for the continuous protection of reciprocating compressors. This\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e3500\/72-03-CN\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003emodule provides advanced signal conditioning for rod position, rod drop, and hyper-compressor crosshead monitoring. In demanding industrial environments such as natural gas midstream processing, oil refining, and chemical manufacturing, the integrity of the piston rod and rider bands is paramount. By delivering real-time wear data and precise displacement tracking, the 3500\/72M allows operators to transition from reactive maintenance to predictive strategies. Identifying excessive rod movement before internal mechanical contact occurs is critical for preventing catastrophic cylinder failure, thereby ensuring maximum machinery uptime and personnel safety in high-pressure environments.\u003c\/p\u003e\n\u003ch3\u003eSuffix Breakdown\u003c\/h3\u003e\n\u003cp\u003eThe alphanumeric configuration of the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e33500\/72-03-CN\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003edefines the following hardware and certification profile:\u003c\/p\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e3500\/72:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eBase model for the Reciprocating Rod Position Monitor.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e-03 (I\/O Module Type):\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eConfigured with an I\/O module featuring Internal Barriers and Internal Terminations. This eliminates the need for external Zener barriers when interfacing with transducers in hazardous areas, streamlining cabinet space and reducing wiring complexity.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e-CN (Agency Approval):\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eSpecifically certified for compliance with Chinese regional standards, including NEPSI (National Supervision and Inspection Center for Explosion Protection and Safety of Instrumentation) and CCC requirements for hazardous area installations.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr class=\"firstRow\"\u003e\n\u003ctd\u003e\u003cstrong\u003eAttribute\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eSpecification Details\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3500\/72-03-CN\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBently Nevada (Baker Hughes)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOrigin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMade in U.S.A.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMonitor Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e4-Channel Reciprocating Monitor\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eI\/O Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eInternal Barriers with Internal Terminations\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMain Board Weight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0.91 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eModule Dimensions\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e24.18 cm x 2.44 cm x 24.13 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOperating Temp\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e-30 to +65 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInput Signal\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eProximity Transducers and Keyphasor\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eShipping Weight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3.0 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eTechnical Maintenance FAQs\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the difference between Rod Drop and Rod Position monitoring?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eRod Drop specifically tracks the vertical wear of the rider bands by measuring the rod's position relative to the cylinder. Rod Position is a more general measurement used to monitor the rod's travel and alignment within the packing case. Both are vital for assessing the health of reciprocating components.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhy does this module require a Keyphasor input?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eFor accurate Rod Drop measurements, the monitor must \"sample\" the rod's position at a consistent point in the stroke (usually the point of maximum rod load). The Keyphasor provides the timing trigger necessary to filter out natural rod runout and flex that occurs at other points in the cycle.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan the 3500\/72-03-CN be used in explosive gas environments?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes. The\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e-03\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eoption indicates that the I\/O module contains internal intrinsic safety barriers. When installed according to the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e-CN\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e(NEPSI) guidelines, it can safely interface with probes located in Zone 0, 1, or 2 hazardous areas.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eEngineering \u0026amp; Installation Guide\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eIntrinsic Safety and Internal Barriers\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e3500\/72-03-CN\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eis equipped with internal barriers to limit electrical energy delivered to the field. When wiring the proximity probes, ensure that the field cables are kept physically separate from all non-intrinsically safe wiring (power cables, relay lines) to prevent induction and maintain the integrity of the safety circuit. Use blue-jacketed cables where required by local regulations to clearly identify IS loops.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTransducer Gapping and Signal Stability\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eSuccessful Rod Drop monitoring depends on the initial gap setting of the proximity probes. The probes must be gapped while the compressor is at a known mechanical state (e.g., Bottom Dead Center). Use the 3500 Rack Configuration software to establish a \"Zero Wear\" baseline when the machine is commissioned with new rider bands. This baseline is the reference for all future wear calculations.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThermal Considerations and Rack Placement\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eWhile the module is rated for operation up to 65 deg C, reciprocating compressor monitors often process high-speed data that generates localized heat. Ensure the 3500 rack has adequate ventilation. If installing in a high-temperature plant environment, utilize a cooling fan assembly at the bottom of the rack to maintain a stable internal temperature, which prevents thermal drift in the analog signal conditioning circuitry.\u003c\/p\u003e\n\u003ch3\u003e\u003c\/h3\u003e","brand":"Bently Nevada","offers":[{"title":"Default Title","offer_id":52668317303147,"sku":"3500\/72-03-CN","price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0953\/3227\/0443\/files\/350072-03-cn-wuiyjnedykr_7c78319b-4ae8-437e-b7f3-41b75782ee11.jpg?v=1765521065","url":"https:\/\/www.plcprotech.com\/products\/bently-nevada-3500-72-03-cn-3500-72m-recip-rod-position-monitor","provider":"PLC ProTech Ltd.","version":"1.0","type":"link"}