{"product_id":"bently-nevada-990-04-70-01-cn-990-series-2-wire-vibration-transmitter","title":"Bently Nevada 990-04-70-01-CN 990 Series 2-Wire Vibration Transmitter","description":"\u003ch3\u003eDescription\u003c\/h3\u003e\n\u003cp style=\"color: #2d3748; margin-bottom: 1rem;\"\u003e\n  Engineered for seamless integration into industrial machinery protection systems, the \u003cstrong\u003eBently Nevada 990-04-70-01-CN\u003c\/strong\u003e functions as a high-precision, loop-powered sensor interface designed to continuously monitor shaft vibration. This 2-wire transmitter converts the dynamic displacement signal from a proximity probe system into a standard 4-20 mA analog current loop, facilitating direct communication with programmable logic controllers (PLCs), distributed control systems (DCSs), or machine condition monitoring platforms. \n\u003c\/p\u003e\n\u003cp style=\"color: #2d3748; margin-bottom: 1rem;\"\u003e\n  Designed for rugged industrial environments, this unit simplifies field wiring by combining the proximitor sensor electronics and transmitter functionality into a single, compact housing. The \u003cstrong\u003e990-04-70-01-CN\u003c\/strong\u003e is factory-configured for a 0-4 mils peak-to-peak measurement range, optimized for a 7.0-meter system length, and equipped with quick-install DIN rail mounting clips.\n\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul style=\"list-style-type: square; color: #2d3748; margin-left: 1.5rem; margin-bottom: 1.5rem;\"\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIntegrated Proximitor Design:\u003c\/strong\u003e Merges proximity probe driver circuitry with 4-20 mA transmitter loops to minimize total component count in monitoring panels.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLoop-Powered 2-Wire Interface:\u003c\/strong\u003e Reduces wiring costs and installation complexity by utilizing the same pair of conductors for both signal transmission and operating power.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNon-Contacting Displacement Measurement:\u003c\/strong\u003e Interfaces with standard eddy current proximity probes to measure dynamic shaft movement without physical contact.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLocal Buffered Output:\u003c\/strong\u003e Provides a raw dynamic signal via a coaxial connector for diagnostic access and vibration analysis with portable instruments.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHigh Noise Immunity:\u003c\/strong\u003e Robust shielding and isolation prevent electromagnetic interference in high-power motor and turbine environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cul style=\"list-style-type: square; color: #2d3748; margin-left: 1.5rem; margin-bottom: 1.5rem;\"\u003e\n  \u003cli\u003eRadial vibration monitoring on centrifugal air and gas compressors.\u003c\/li\u003e\n  \u003cli\u003eCasing and shaft vibration monitoring of industrial steam and gas turbines.\u003c\/li\u003e\n  \u003cli\u003eOverhung fan shaft displacement tracking in cooling towers.\u003c\/li\u003e\n  \u003cli\u003eContinuous condition monitoring of heavy-duty process pumps.\u003c\/li\u003e\n  \u003cli\u003eBalance-of-plant rotating machinery protection where full rack systems are not required.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eModel Suffix Configuration\u003c\/h3\u003e\n\u003cdiv style=\"overflow-x: auto; width: 100%; margin-bottom: 1.5rem;\"\u003e\n  \u003ctable style=\"border-collapse: collapse; width: 100%; color: #2d3748; font-size: 0.9rem;\"\u003e\n    \u003cthead\u003e\n      \u003ctr style=\"border-bottom: 2px solid #1a365d; text-align: left;\"\u003e\n        \u003cth style=\"padding: 8px;\"\u003eSuffix Code\u003c\/th\u003e\n        \u003cth style=\"padding: 8px;\"\u003eOption Class\u003c\/th\u003e\n        \u003cth style=\"padding: 8px;\"\u003eTechnical Specification\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003e-04\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003eFull-Scale Range\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003e0 to 4 mils pp (0 to 100 micrometers peak-to-peak)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003e-70\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003eSystem Length\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003e7.0 meters (23.0 feet) total electrical length\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003e-01\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003eMounting Hardware\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003e35 mm DIN rail clips pre-installed\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003e-CN\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003eAgency Approvals\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003eRegion-specific safety certifications (China\/Asia-Pacific)\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cdiv style=\"overflow-x: auto; width: 100%; margin-bottom: 1.5rem;\"\u003e\n  \u003ctable style=\"border-collapse: collapse; width: 100%; color: #2d3748; font-size: 0.9rem;\"\u003e\n    \u003ctbody\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold; width: 35%;\"\u003eManufacturer\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003eBently Nevada\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eModel Series\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003e990 Vibration Transmitter Series\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eFull-Scale Input Range\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003e0 to 4 mils peak-to-peak (0 to 100 um pp)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eOutput Signal Range\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003e4 to 20 mA DC (proportional to full scale)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eOperating Voltage\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003e12 to 35 VDC (at the transmitter terminal)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eMaximum Loop Resistance\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003eRLoop = (VSupply - 12V) \/ 0.02A ohms\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eRequired Probe Compatibility\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003e3300 XL 8mm proximity probe (or verified equivalent)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eTarget Calibration Material\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003eAISI 4140 steel (standard target configuration)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eOperating Temperature Range\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003e-35 to +85 Celsius\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eStorage Temperature Range\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003e-40 to +100 Celsius\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eCountry of Origin\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003eUnited States\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eShipping Weight (Calculated)\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003e1.5 kg (approx. 3.3 lbs)\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch3\u003eConnections and Interfaces\u003c\/h3\u003e\n\u003cdiv style=\"overflow-x: auto; width: 100%; margin-bottom: 1.5rem;\"\u003e\n  \u003ctable style=\"border-collapse: collapse; width: 100%; color: #2d3748; font-size: 0.9rem;\"\u003e\n    \u003cthead\u003e\n      \u003ctr style=\"border-bottom: 2px solid #1a365d; text-align: left;\"\u003e\n        \u003cth style=\"padding: 8px; width: 30%;\"\u003eTerminal \/ Port\u003c\/th\u003e\n        \u003cth style=\"padding: 8px;\"\u003eLabel \/ Standard Marker\u003c\/th\u003e\n        \u003cth style=\"padding: 8px;\"\u003eFunction \u0026amp; Circuit Assignment\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003ePin 1\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003e+ \/ PWR\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003ePositive supply voltage connection (4-20 mA Loop +)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003ePin 2\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003e- \/ SIG\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003eSignal return connection (4-20 mA Loop -)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003ePin 3\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003eSHD\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003eInstrumentation shield tie-point (internally isolated from DIN rail)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eCoaxial Port\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003eBUF\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003eCoaxial buffered raw voltage output (approx. 7.87 V\/mm scale)\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch3\u003eEmpirical Engineering Insights\u003c\/h3\u003e\n\u003ch4\u003eAlternative Models \u0026amp; Compatibility\u003c\/h4\u003e\n\u003cp style=\"color: #2d3748; margin-bottom: 1rem;\"\u003e\n  The \u003cstrong\u003e990-04-70-01-CN\u003c\/strong\u003e requires an absolute electrical system length match of 7.0 meters. Do not mix and match with 5.0-meter probe configurations (such as the -50 options) or non-3300 XL systems without recalibrating, as mismatching will cause extreme signal non-linearity and scale factor errors. \n\u003c\/p\u003e\n\n\u003ch4\u003eApplication Pitfalls \u0026amp; Engineering Notes\u003c\/h4\u003e\n\u003cp style=\"color: #2d3748; margin-bottom: 1rem;\"\u003e\n  In highly active electromagnetic environments (e.g., adjacent to variable frequency drives), a common error is allowing the transmitter housing to float electrically. Ensure the 35 mm DIN rail has a direct, low-impedance ground path. Additionally, calculate loop resistance strictly using the minimum expected voltage supply at the cabinet to prevent transmitter dropout at full-scale signal levels (20 mA peaks).\n\u003c\/p\u003e\n\n\u003ch4\u003eCommissioning \u0026amp; Wiring Tips\u003c\/h4\u003e\n\u003cp style=\"color: #2d3748; margin-bottom: 1rem;\"\u003e\n  When wiring the coaxial sensor extension cable, protect the connector with self-fusing silicone tape or heat-shrink tubing to prevent moisture ingress. Liquid intrusion at the probe-to-extension cable joint alters loop impedance, showing up on the DCS as false high vibration or erratic signal spikes.\n\u003c\/p\u003e\n\n\u003ch3\u003eInstallation Guidelines\u003c\/h3\u003e\n\u003cdiv style=\"background-color: #fff5f5; border-left: 4px solid #c53030; padding: 1rem; margin-bottom: 1.5rem; border-radius: 4px;\"\u003e\n  \u003cp style=\"margin: 0; font-weight: bold; color: #9b2c2c;\"\u003eCRITICAL SAFETY WARNING\u003c\/p\u003e\n  \u003cp style=\"margin: 0.5rem 0 0 0; color: #742a2a; font-size: 0.95rem;\"\u003e\n    Before installing, removing, or performing maintenance on the transmitter, de-energize all connected electrical loops. Ensure the ambient atmosphere is certified non-hazardous or that proper intrinsically safe barriers are active if deploying this -CN model in classified field areas.\n  \u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv style=\"display: flex; flex-direction: column; gap: 1rem; margin-bottom: 1.5rem;\"\u003e\n  \u003cdiv style=\"display: flex; align-items: flex-start; gap: 1rem;\"\u003e\n    \u003cdiv style=\"background-color: #2b6cb0; color: #ffffff; border-radius: 50%; min-width: 28px; height: 28px; display: flex; align-items: center; justify-content: center; font-weight: bold; font-size: 0.9rem;\"\u003e1\u003c\/div\u003e\n    \u003cdiv style=\"color: #2d3748; padding-top: 2px;\"\u003e\n      Mount the unit firmly onto standard 35 mm symmetric DIN rail (EN 50022) using the integrated -01 mounting clips. Ensure the rail is bonded to a noise-free industrial ground.\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n  \u003cdiv style=\"display: flex; align-items: flex-start; gap: 1rem;\"\u003e\n    \u003cdiv style=\"background-color: #2b6cb0; color: #ffffff; border-radius: 50%; min-width: 28px; height: 28px; display: flex; align-items: center; justify-content: center; font-weight: bold; font-size: 0.9rem;\"\u003e2\u003c\/div\u003e\n    \u003cdiv style=\"color: #2d3748; padding-top: 2px;\"\u003e\n      Connect the 7.0-meter proximity probe coaxial cable system to the integrated coaxial input connector on the transmitter. Hand-tighten the coupling, then snug-tighten to prevent vibration loosening.\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n  \u003cdiv style=\"display: flex; align-items: flex-start; gap: 1rem;\"\u003e\n    \u003cdiv style=\"background-color: #2b6cb0; color: #ffffff; border-radius: 50%; min-width: 28px; height: 28px; display: flex; align-items: center; justify-content: center; font-weight: bold; font-size: 0.9rem;\"\u003e3\u003c\/div\u003e\n    \u003cdiv style=\"color: #2d3748; padding-top: 2px;\"\u003e\n      Route a shielded, twisted-pair instrument cable from the 4-20 mA loop controller to the transmitter terminal block. Terminate +PWR to Pin 1, -SIG to Pin 2, and the cable shield to Pin 3 (SHD).\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n  \u003cdiv style=\"display: flex; align-items: flex-start; gap: 1rem;\"\u003e\n    \u003cdiv style=\"background-color: #2b6cb0; color: #ffffff; border-radius: 50%; min-width: 28px; height: 28px; display: flex; align-items: center; justify-content: center; font-weight: bold; font-size: 0.9rem;\"\u003e4\u003c\/div\u003e\n    \u003cdiv style=\"color: #2d3748; padding-top: 2px;\"\u003e\n      Apply loop power (typically 24 VDC) and verify quiescent loop current draws approximately 4 mA under static (no-vibration, gapped probe) conditions.\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e","brand":"Bently Nevada","offers":[{"title":"Default Title","offer_id":52668303573355,"sku":"990-04-70-01-CN","price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0953\/3227\/0443\/files\/990-04-70-01-CN-t1ekda5ofh1_2f500447-913f-494b-9a07-4299a6e98c83.jpg?v=1765520624","url":"https:\/\/www.plcprotech.com\/products\/bently-nevada-990-04-70-01-cn-990-series-2-wire-vibration-transmitter","provider":"PLC ProTech Ltd.","version":"1.0","type":"link"}