{"product_id":"bently-nevada-176449-09-3500-70m-recip-impulse-velocity-monitor","title":"Bently Nevada 176449-09 3500\/70M Recip Impulse Velocity Monitor","description":"\u003ch3\u003eProduct Overview\u003c\/h3\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e176449-09 (3500\/70M)\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eis a specialized 4-channel monitoring module engineered specifically for the reciprocating compressor solutions package within the Bently Nevada 3500 Machinery Protection System. Designed for high-stakes environments in gas transmission, refinery hydro-treaters, and chemical processing, this module accepts inputs from seismic transducers to monitor critical crankcase and crosshead vibration levels. By utilizing advanced impulse acceleration and recip velocity algorithms, the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e176449-09\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003edetects mechanical looseness and impact events long before they escalate into catastrophic frame or rod failures. Its integration into the 3500 rack ensures continuous machinery protection, providing essential diagnostic data that allows operators to transition from reactive repairs to optimized, condition-based maintenance schedules.\u003c\/p\u003e\n\u003ch3\u003eTechnical Configuration\u003c\/h3\u003e\n\u003cp\u003eThe 3500\/70M module utilizes a versatile 4-channel architecture designed for the unique dynamic signatures of reciprocating machinery.\u003c\/p\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eDual-Pair Programming:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eChannels are programmed in pairs (1\/2 and 3\/4), allowing the monitor to perform two distinct functions simultaneously across the four inputs. Supported functions include Impulse Acceleration, Acceleration 2, Recip Velocity, and Low Frequency Recip Velocity.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eSignal Conditioning:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe module conditions raw seismic signals to derive peak vibration measurements, which are then compared against user-programmable alarm setpoints.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eBuffered Outputs:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe front panel features four short-circuit protected coaxial connectors (one per channel), providing direct access to raw transducer signals for external diagnostic instruments without compromising the protection loop.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eAlert\/Danger Logic:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eEach channel can be configured with independent Alert and Danger setpoints, driving system relays to trigger automatic machinery shutdowns or operator warnings based on configured voting logic.\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\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e176449-09 (3500\/70M)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eBently Nevada\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eOrigin\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eU.S.A.\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eInput Channels\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e4 Seismic (Velocity or Acceleration)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003ePower Consumption\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e7.7 Watts typical\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eOperating Temp\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e-30 to +65 Celsius\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eStorage Temp\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e-40 to +85 Celsius\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eHumidity\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e95 percent non-condensing\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eDimensions\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e241.3 mm x 24.4 mm x 241.8 mm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e0.91 kg (2.0 lb)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eStatus LEDs\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eOK, TX\/RX, Bypass\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eField Application FAQs\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the specific benefit of Impulse Acceleration for reciprocating units?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eReciprocating compressors generate distinct impulse signals when mechanical components like crosshead pins or bolts become loose. The 3500\/70M Impulse Acceleration function is tuned to detect these high-frequency, short-duration impacts that standard velocity monitoring might miss.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan the 3500\/70M be used in hazardous area installations?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes, when paired with the appropriate Internal Barrier I\/O modules (such as the 135473-01), the system is certified for use in intrinsically safe environments under CSA, ATEX, and IECEx standards.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat causes the \"Bypass\" LED to illuminate?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe Bypass LED turns on when one or more channels have their alarm logic inhibited. This is typically done via the 3500 Rack Configuration Software during machine start-up or transducer maintenance to prevent nuisance trips.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eEngineering Installation and Reliability Guidelines\u003c\/h3\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eI\/O Module Selection:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eEnsure the 176449-09 is paired with the correct I\/O module for your termination style. Use Internal Termination I\/O (140471-01) for direct rack wiring, or External Termination I\/O (140482-01) if utilizing a remote terminal strip.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eSeismic Transducer Placement:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eFor crosshead vibration monitoring, seismic sensors must be mounted securely in the direction of the crosshead travel. Ensure the mounting surface is flat and free of paint to maintain high-frequency signal transmission.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eWiring and Shielding:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eUse high-quality shielded twisted-pair cabling for all seismic inputs. To prevent ground loops, terminate the shield at the 3500 rack ground only; do not ground the shield at the transducer end unless using a specific isolated mounting base.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eTorque and Mounting:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eWhen installing the 3500\/70M into the rack, ensure the chassis screws are tightened to provide a low-impedance ground path for EMI protection. For the seismic sensors in the field, follow the specific torque requirements for 1\/4-28 or M8 mounting studs to avoid resonance errors.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Bently Nevada","offers":[{"title":"Default Title","offer_id":52666516308331,"sku":"3500\/70M 176449-09","price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0953\/3227\/0443\/files\/bently-nevada-3500-70m-176449-09-recip-impulse-velocity-monitor-0te3jbc4wu3_55047821-4da1-4958-809a-9be6b9614726.jpg?v=1765440088","url":"https:\/\/www.plcprotech.com\/products\/bently-nevada-176449-09-3500-70m-recip-impulse-velocity-monitor","provider":"PLC ProTech Ltd.","version":"1.0","type":"link"}