{"product_id":"bently-nevada-3500-72-01-cn-3500-72m-rod-position-monitor","title":"Bently Nevada 3500\/72-01-CN | 3500\/72M Rod Position Monitor","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThe Bently Nevada\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e3500\/72-01-CN (3500\/72-01-CN)\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eis a four-channel machinery protection module engineered specifically to satisfy API 618 requirements for reciprocating compressors. Operating within the globally deployed 3500 series machinery protection system, this monitor is widely utilized in oil refining, natural gas storage, and petrochemical processing facilities. By accepting inputs from up to four proximity transducers, it monitors critical metrics including rod position, rod drop, and hyper-compressor performance. The module continuously tracks the mechanical displacement of the piston rod relative to the cylinder bore, calculating exact rider band wear in real time. This constant diagnostic screening prevents catastrophic piston-to-cylinder contact, minimizes unplanned process shutdowns, and extends the operational lifespan of heavy rotating assets.\u003c\/p\u003e\n\u003ch3\u003eHardware Configuration \u0026amp; Suffix Anatomy\u003c\/h3\u003e\n\u003cp\u003eThe product code\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e3500\/72-01-CN\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003edefines a specialized hardware and certification layout built for direct cabinet termination and regional explosive-atmosphere compliance:\u003c\/p\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e3500\/72M\u003c\/strong\u003e: Specifies the base Reciprocating Compressor Rod Position Monitor module series, delivering precise signal conditioning, dynamic\/static position values, and customizable dual-level alert\/danger alarm logic configured in channel pairs.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e-01\u003c\/strong\u003e: Designates the I\/O Module with Internal Terminations, enabling direct field wiring connections straight to the backplane, eliminating external terminal panels, and simplifying structural cabinet layout.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e-CN\u003c\/strong\u003e: Denotes China-specific hazardous area approvals, covering NEPSI and CCC requirements alongside ATEX\/IECEx certifications for intrinsically safe or flameproof operations in volatile gas and dust environments. This globally procured version ensures compliance for equipment intended for, or compatible with, Chinese industrial markets.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003ePerformance Specifications\u003c\/h3\u003e\n\u003ctable style=\"width: 100%; height: 274.313px;\"\u003e\n\u003cthead\u003e\n\u003ctr class=\"firstRow\" style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 27.7789%; height: 19.5938px;\"\u003e\u003cstrong\u003eParameter\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 69.3639%; height: 19.5938px;\"\u003e\u003cstrong\u003eCertified Specification Value\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 27.7789%; height: 19.5938px;\"\u003e\u003cspan\u003eModel\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 69.3639%; height: 19.5938px;\"\u003e\u003cspan\u003e3500\/72-01-CN (3500\/72M)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 27.7789%; height: 19.5938px;\"\u003e\u003cspan\u003eBrand\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 69.3639%; height: 19.5938px;\"\u003e\u003cspan\u003eBently Nevada (Baker Hughes)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 27.7789%; height: 19.5938px;\"\u003e\u003cspan\u003eOrigin\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 69.3639%; height: 19.5938px;\"\u003e\u003cspan\u003eUnited States (USA)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 27.7789%; height: 19.5938px;\"\u003e\u003cspan\u003eChannel Capacity\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 69.3639%; height: 19.5938px;\"\u003e\u003cspan\u003eAccepts 1 to 4 proximity probe signals\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 39.1875px;\"\u003e\n\u003ctd style=\"width: 27.7789%; height: 39.1875px;\"\u003e\u003cspan\u003eNominal Scale Factor Options\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 69.3639%; height: 39.1875px;\"\u003e\u003cspan\u003e0.79 mV\/um (20 mV\/mil), 3.94 mV\/um (100 mV\/mil), or 7.87 mV\/um (200 mV\/mil)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 27.7789%; height: 19.5938px;\"\u003e\u003cspan\u003eInput Impedance\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 69.3639%; height: 19.5938px;\"\u003e\u003cspan\u003e10 kOhm nominal\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 27.7789%; height: 19.5938px;\"\u003e\u003cspan\u003ePower Consumption\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 69.3639%; height: 19.5938px;\"\u003e\u003cspan\u003e7.7 watts nominal\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 39.1875px;\"\u003e\n\u003ctd style=\"width: 27.7789%; height: 39.1875px;\"\u003e\u003cspan\u003eBuffered Outputs\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 69.3639%; height: 39.1875px;\"\u003e\u003cspan\u003eFront coaxial connectors, short-circuit protected, 510 Ohm output impedance\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 27.7789%; height: 19.5938px;\"\u003e\u003cspan\u003eOperating Temperature\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 69.3639%; height: 19.5938px;\"\u003e\u003cspan\u003e-30 deg C to 65 deg C (-22 deg F to 149 deg F)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 27.7789%; height: 19.5938px;\"\u003e\u003cspan\u003eModule Dimensions\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 69.3639%; height: 19.5938px;\"\u003e\u003cspan\u003e241.3 mm x 24.4 mm x 241.8 mm (9.50 in x 0.96 in x 9.52 in)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 27.7789%; height: 19.5938px;\"\u003e\u003cspan\u003eShipping Weight\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 69.3639%; height: 19.5938px;\"\u003e\u003cspan\u003e2.0 kg\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eCritical Diagnostics \u0026amp; Compatibility FAQs\u003c\/h3\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How does the 3500\/72-01-CN manage channels to run multiple diagnostic functions?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: The monitor's microprocessor programs channels in pairs (Channels 1 and 2, and\/or Channels 3 and 4). This architecture allows the module to run up to two distinct monitoring functions simultaneously, such as configuring channels 1 and 2 for rod drop while channels 3 and 4 measure standard rod position.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What safety actions occur if the transducers in a hyper-compressor configuration fail?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: In a hyper-compressor monitoring configuration, the module is engineered with a strict safety fail-safe. If both associated proximity transducers enter a NOT OK state, the monitor bypasses the standard time delays and issues an immediate Danger alarm to trigger emergency shutdown relays.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What is the benefit of the front-facing buffered coaxial outputs?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: The front panel features independent coaxial connections for each of the four channels. These outputs provide raw, unconditioned analog transducer signals directly to external diagnostic equipment, such as a portable vibration analyzer, without interrupting the active online protection loop.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003eOn-Site Engineering \u0026amp; Installation Guidelines\u003c\/h3\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eTarget Calibration \u0026amp; Scale Factors:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eEnsure the scale factor configured in the 3500 Rack Configuration Software matches the installed probe type. For instance, standard 3300 XL 8 mm probes require a configuration of 7.87 mV\/um (200 mV\/mil). Mismatching the software scale factors with the physical transducers will cause highly inaccurate rider band wear calculations and erroneous alarms.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eKeyphasor Phase Synchronization:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eAccurate rod drop and position measurements require synchronization with the shaft rotation. Verify that the Keyphasor phase reference signal is active, clean, and correctly mapped to the 3500\/72-01-CN module inside the rack configuration. Any instability in the Keyphasor pulse will disrupt the measurement window, leading to channel faults or deactivated alarms.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eWiring Separation and Grounding:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eAlways run field transducer wiring in dedicated, grounded metal conduits separated from high-voltage motor power cables. Ensure the cable shields are grounded solely at the internal termination block of the I\/O module to prevent electromagnetic noise from distorting the high-frequency eddy current signals.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Bently Nevada","offers":[{"title":"Default Title","offer_id":52668323692907,"sku":"3500\/72-01-CN","price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0953\/3227\/0443\/files\/350072-01-cn-hzhexotjvdo_917cb6d2-d8aa-4188-b069-1db24eeb7e35.jpg?v=1765521242","url":"https:\/\/www.plcprotech.com\/products\/bently-nevada-3500-72-01-cn-3500-72m-rod-position-monitor","provider":"PLC ProTech Ltd.","version":"1.0","type":"link"}