{"product_id":"bently-nevada-990-04-70-02-00-vibration-transmitter","title":"Bently Nevada 990-04-70-02-00 Vibration Transmitter","description":"\u003ch2\u003eBently Nevada 990-04-70-02-00 Vibration Transmitter\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eBently Nevada 990-04-70-02-00\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003e990\u003c\/strong\u003e Vibration Transmitter, operates as a dedicated hardware component for converting proximity probe signals into a proportional 4-20 mA loop-powered output within machinery control and protection systems. The two-wire device conditions raw eddy-current inputs from a 3300 NSv proximity probe into peak-to-peak vibration amplitude values.\u003c\/p\u003e\n\u003ch3\u003eSuffix Breakdown \u0026amp; Model Matrix\u003c\/h3\u003e\n\u003cp\u003eThe full part number designates specific factory configurations for scaling, cable length, mounting, and certifications:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e04\u003c\/strong\u003e: Full-scale option rated for 0-4 mils pp (0-100 um pp).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e70\u003c\/strong\u003e: System length option specified for 7.0 meters (23.0 feet).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e02\u003c\/strong\u003e: Mounting option configured for bulkhead screws.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e00\u003c\/strong\u003e: Agency approval option designated as not required.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHardware Specifications\u003c\/h3\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cstrong\u003eParameter\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003e990-04-70-02-00\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eBently Nevada\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eUSA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.44 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e10 x 7.3 x 6 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003eIndustrial Grade\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003eLoop-powered (4-20 mA)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTarget Sensor Input\u003c\/td\u003e\n\u003ctd\u003e3300 NSv proximity probe and matching extension cable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrimary Output\u003c\/td\u003e\n\u003ctd\u003e2-wire, 4-20 mA DC proportional to peak-to-peak vibration\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiagnostic Output\u003c\/td\u003e\n\u003ctd\u003eNon-isolated PROX OUT and COM via coaxial connector\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTuning Mechanisms\u003c\/td\u003e\n\u003ctd\u003eNon-interacting zero and span potentiometers\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eGap Voltage Validation \u0026amp; Signal Conditioning\u003c\/h3\u003e\n\u003cp\u003eThe integrated Proximitor sensor electronics demand precise gap voltage validation (-10 VDC targets) during proximity probe positioning to ensure optimal eddy-current probe scaling. Proper mechanical alignment prevents signal clipping and maintains linear conversion across the entire full-scale displacement range. To eliminate false trips during rotor dynamics transitions, the onboard Not OK\/Signal Defeat circuit suppresses cross-talk and isolates the 4-20 mA output loop immediately upon detecting a loose coaxial connection or probe failure.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: Can the dynamic vibration signal be captured while the transmitter is online?\u003c\/p\u003e\n\u003cp\u003eA: Yes. The transmitter incorporates non-isolated PROX OUT and COM terminals alongside a physical coaxial connector. This architecture permits field test equipment or data collectors to tap the raw gap voltage and dynamic vibration signal simultaneously without interrupting the primary 4-20 mA process loop.\u003c\/p\u003e\n\u003cp\u003eQ: How is the 4-20 mA loop calibrated or adjusted in the field?\u003c\/p\u003e\n\u003cp\u003eA: Loop calibration is performed via non-interacting zero and span potentiometers located directly under the transmitter label. Additionally, a dedicated Test Input pin permits the introduction of a function generator signal to simulate operational conditions and verify loop output limits.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting Alignment\u003c\/strong\u003e: Secure the transmitter package using the designated bulkhead screws. Ensure the installation surface is free of mechanical resonance that matches rotor dynamics frequencies.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWiring Protocols\u003c\/strong\u003e: Route the two-wire loop power cabling through dedicated, grounded conduits. Maintain separation between high-voltage power lines and the low-voltage sensor lines to prevent electromagnetic cross-talk.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShielding and Grounding\u003c\/strong\u003e: Proximity probe extension cables must be firmly seated into the coaxial connector. Ground all outer cable shields at a single, well-defined reference point, typically at the receiver\/control cabinet chassis, to eliminate ground loops.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cstrong\u003e\u003cspan style=\"color: #e74c3c;\"\u003e\u003cspan style=\"font-size: 20px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e \u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e","brand":"Bently Nevada","offers":[{"title":"Default Title","offer_id":44323537977443,"sku":null,"price":180.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0549\/2775\/3315\/files\/990-04-70-02-00-1.jpg?v=1783385656","url":"https:\/\/precisemodule.com\/products\/bently-nevada-990-04-70-02-00-vibration-transmitter","provider":"Precise Module Ltd.","version":"1.0","type":"link"}