{"product_id":"991-25-70-01-cn-bently-nevada-991-thrust-transmitter","title":"991-25-70-01-CN | Bently-Nevada | 991 Thrust Transmitter","description":"\u003ch3\u003eDescription\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003e991-25-70-01-CN\u003c\/strong\u003e is a 2-wire, loop-powered thrust transmitter designed to provide a proportional 4 to 20 mA axial displacement signal for rotating machinery monitoring applications. It accepts input from a \u003cstrong\u003e3300 NSv proximity probe\u003c\/strong\u003e and matching extension cable, then conditions the signal into engineering units proportional to shaft axial position for machinery control and protection systems.\u003c\/p\u003e\n\u003cp\u003eThe \u003cstrong\u003e991 Thrust Transmitter\u003c\/strong\u003e integrates the Proximitor Sensor within the transmitter housing, eliminating the need for an external unit. It provides non-isolated PROX OUT and COM outputs for dynamic vibration and gap voltage diagnostics, supporting machinery analysis and troubleshooting.\u003c\/p\u003e\n\u003cp\u003eThe transmitter is suitable for centrifugal air compressors, pumps, motors, and fans where compact installation space and continuous thrust position indication are required. Compatibility with the \u003cstrong\u003e3300 NSv proximity probe\u003c\/strong\u003e allows installation in small clearance areas typical of centrifugal compressor systems.\u003c\/p\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e2-wire loop-powered transmitter\u003c\/li\u003e\n\u003cli\u003e4 to 20 mA proportional thrust position output\u003c\/li\u003e\n\u003cli\u003eIntegrated Proximitor Sensor\u003c\/li\u003e\n\u003cli\u003eCompatible with 3300 NSv proximity probe systems\u003c\/li\u003e\n\u003cli\u003eNon-isolated PROX OUT diagnostic signal\u003c\/li\u003e\n\u003cli\u003eCoaxial connector for vibration diagnostics\u003c\/li\u003e\n\u003cli\u003eNon-interacting zero and span adjustments\u003c\/li\u003e\n\u003cli\u003eTest Input pin for loop verification\u003c\/li\u003e\n\u003cli\u003ePower-up inhibit circuit\u003c\/li\u003e\n\u003cli\u003eNot OK\/Signal Defeat protection circuit\u003c\/li\u003e\n\u003cli\u003eDIN-rail mounting support\u003c\/li\u003e\n\u003cli\u003ePotted construction for high humidity environments\u003c\/li\u003e\n\u003cli\u003eSuitable for 100% condensing environments\u003c\/li\u003e\n\u003cli\u003eSupports compact installation areas\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCentrifugal air compressors\u003c\/li\u003e\n\u003cli\u003eSmall industrial pumps\u003c\/li\u003e\n\u003cli\u003eRotating machinery monitoring\u003c\/li\u003e\n\u003cli\u003eMotor thrust position measurement\u003c\/li\u003e\n\u003cli\u003eFan shaft displacement monitoring\u003c\/li\u003e\n\u003cli\u003eOEM machinery control systems\u003c\/li\u003e\n\u003cli\u003eTurbine auxiliary systems\u003c\/li\u003e\n\u003cli\u003eMachinery protection systems\u003c\/li\u003e\n\u003cli\u003eCondition monitoring panels\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eOrdering Information\u003c\/h3\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eModel Code\u003c\/th\u003e\n\u003cth\u003eDescription\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e991\u003c\/td\u003e\n\u003ctd\u003eThrust Transmitter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e-25\u003c\/td\u003e\n\u003ctd\u003e25-0-25 mils\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e-70\u003c\/td\u003e\n\u003ctd\u003e7.0 metres (23.0 feet)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e-01\u003c\/td\u003e\n\u003ctd\u003e35 mm DIN-rail clips\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e-CN\u003c\/td\u003e\n\u003ctd\u003eChina explosion-proof certification NEPSI\/CCC\/ATEX\/IECEx\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eCategory\u003c\/th\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturer\u003c\/td\u003e\n\u003ctd\u003eBently Nevada\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Model\u003c\/td\u003e\n\u003ctd\u003e991-25-70-01-CN\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eThrust Transmitter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeries\u003c\/td\u003e\n\u003ctd\u003e991\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Type\u003c\/td\u003e\n\u003ctd\u003e1 non-contacting 3300 NSv Proximity Probe and extension cable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Requirement\u003c\/td\u003e\n\u003ctd\u003e+12 to +35 Vdc\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSignal Output\u003c\/td\u003e\n\u003ctd\u003e4 to 20 mAdc\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConfiguration\u003c\/td\u003e\n\u003ctd\u003e2-wire\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLoop Accuracy\u003c\/td\u003e\n\u003ctd\u003eWithin +\/-1.5% full scale typical\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Loop Resistance\u003c\/td\u003e\n\u003ctd\u003e1000 ohm including cable at 35 Vdc\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent Limiting\u003c\/td\u003e\n\u003ctd\u003e23 mA typical\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eZero and Span Adjustment\u003c\/td\u003e\n\u003ctd\u003eNon-interacting external adjustments\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNot OK\/Signal Defeat Response\u003c\/td\u003e\n\u003ctd\u003eOutput less than 3.6 mA within 100 us\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSignal Recovery Time\u003c\/td\u003e\n\u003ctd\u003eRestored within 0.1 seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Impedance\u003c\/td\u003e\n\u003ctd\u003e10 kohm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLinear Range\u003c\/td\u003e\n\u003ctd\u003e0.25 to 1.65 mm (10 to 65 mils)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProx Out Incremental Scale Factor\u003c\/td\u003e\n\u003ctd\u003e7.87 mV\/um (200 mV\/mil) +\/-6.5% typical\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTemperature Stability\u003c\/td\u003e\n\u003ctd\u003eWithin +\/-10% from 0 degC to +70 degC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMinimum Target Size\u003c\/td\u003e\n\u003ctd\u003e9.5 mm diameter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLeadwire Length\u003c\/td\u003e\n\u003ctd\u003e3 metres maximum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Distance Non-Hazardous Areas\u003c\/td\u003e\n\u003ctd\u003e13 km\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Distance Intrinsically Safe Areas\u003c\/td\u003e\n\u003ctd\u003e68 metres\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temperature\u003c\/td\u003e\n\u003ctd\u003e-35 degC to +85 degC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStorage Temperature\u003c\/td\u003e\n\u003ctd\u003e-51 degC to +100 degC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProbe Operating Temperature\u003c\/td\u003e\n\u003ctd\u003e-35 degC to +177 degC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProbe Storage Temperature\u003c\/td\u003e\n\u003ctd\u003e-51 degC to +177 degC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRelative Humidity\u003c\/td\u003e\n\u003ctd\u003e100% condensing non-submerged\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTransducer Tip Material\u003c\/td\u003e\n\u003ctd\u003ePolyphenylene sulfide (PPS)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTransducer Case Material\u003c\/td\u003e\n\u003ctd\u003eAISI 303 or 304 stainless steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProbe Cable Type\u003c\/td\u003e\n\u003ctd\u003e75 ohm coaxial FEP insulated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCable Armor\u003c\/td\u003e\n\u003ctd\u003eFlexible AISI 302 SST optional\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTensile Strength\u003c\/td\u003e\n\u003ctd\u003e222 N maximum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTransmitter Weight\u003c\/td\u003e\n\u003ctd\u003e0.43 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal System Weight\u003c\/td\u003e\n\u003ctd\u003e0.82 kg typical\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions (H x W x D)\u003c\/td\u003e\n\u003ctd\u003e53.3 mm x 73.9 mm x 100.1 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody Height Without DIN Clip\u003c\/td\u003e\n\u003ctd\u003e42.6 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting Hole Distance (W x L)\u003c\/td\u003e\n\u003ctd\u003e63.5 mm x 69.9 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting Hole Diameter\u003c\/td\u003e\n\u003ctd\u003e5.8 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eElectrical Classification\u003c\/td\u003e\n\u003ctd\u003eCSA\/NRTL\/C approval in North America and VDE approval in Europe\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEurope Marking\u003c\/td\u003e\n\u003ctd\u003eCE\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCountry of Origin\u003c\/td\u003e\n\u003ctd\u003eU.S.A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eConnections\/Interfaces\u003c\/h3\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eConnector Pin\u003c\/th\u003e\n\u003cth\u003eFunction\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003ePROX OUT\u003c\/td\u003e\n\u003ctd\u003eDynamic vibration and gap voltage signal output\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCOM\u003c\/td\u003e\n\u003ctd\u003eCommon terminal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTest Input\u003c\/td\u003e\n\u003ctd\u003eLoop signal verification input\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBNC Connector\u003c\/td\u003e\n\u003ctd\u003eProximitor Sensor diagnostic output\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eInstallation Guidelines\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eInstall the transmitter on a grounded 35 mm DIN rail.\u003c\/li\u003e\n\u003cli\u003eMaintain proper probe gap adjustment during commissioning.\u003c\/li\u003e\n\u003cli\u003eSeparate probe cables from high-voltage power wiring.\u003c\/li\u003e\n\u003cli\u003eUse shielded cable routing practices to reduce EMI and RFI interference.\u003c\/li\u003e\n\u003cli\u003eProtect coaxial connectors from moisture exposure.\u003c\/li\u003e\n\u003cli\u003eVerify loop power supply voltage before startup.\u003c\/li\u003e\n\u003cli\u003eUse the 122115-01 Test Adapter when connecting grounded AC-powered diagnostic equipment.\u003c\/li\u003e\n\u003cli\u003eEnsure proper signal isolation during machinery diagnostics.\u003c\/li\u003e\n\u003cli\u003eAvoid excessive mechanical stress on probe lead connections.\u003c\/li\u003e\n\u003cli\u003eConfirm correct polarity before energizing the loop circuit.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCompliance and Certifications\u003c\/h3\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eCertification\u003c\/th\u003e\n\u003cth\u003eDescription\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eCSA\/NRTL\/C\u003c\/td\u003e\n\u003ctd\u003eGeneral Purpose Approval for North America\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVDE\u003c\/td\u003e\n\u003ctd\u003eEurope approval\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCE\u003c\/td\u003e\n\u003ctd\u003eEuropean CE marking\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNEPSI\u003c\/td\u003e\n\u003ctd\u003eChina explosion-proof certification\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCCC\u003c\/td\u003e\n\u003ctd\u003eChina Compulsory Certification\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eATEX\u003c\/td\u003e\n\u003ctd\u003eHazardous area certification\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIECEx\u003c\/td\u003e\n\u003ctd\u003eInternational hazardous area certification\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the primary function of this transmitter?\u003c\/strong\u003e\u003cbr\u003eIt converts axial shaft displacement into a proportional 4 to 20 mA signal.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhich probe system is compatible with this model?\u003c\/strong\u003e\u003cbr\u003eThe transmitter is designed for use with the 3300 NSv proximity probe system.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes the transmitter require an external Proximitor unit?\u003c\/strong\u003e\u003cbr\u003eNo. The Proximitor Sensor is integrated into the transmitter.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat output signal does the device provide?\u003c\/strong\u003e\u003cbr\u003eIt provides a 4 to 20 mAdc industry-standard signal.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan the PROX OUT signal be used for diagnostics?\u003c\/strong\u003e\u003cbr\u003eYes. The PROX OUT connection supports vibration and gap voltage diagnostics.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat mounting method does this configuration use?\u003c\/strong\u003e\u003cbr\u003eThis model uses 35 mm DIN-rail clips.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs the transmitter suitable for humid environments?\u003c\/strong\u003e\u003cbr\u003eYes. The potted construction supports 100% condensing environments.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat happens during a Not OK condition?\u003c\/strong\u003e\u003cbr\u003eThe output drops below 3.6 mA within 100 microseconds.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan grounded test equipment connect directly to PROX OUT?\u003c\/strong\u003e\u003cbr\u003eThe manual recommends using the 122115-01 Test Adapter for signal isolation.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat industries commonly use this transmitter?\u003c\/strong\u003e\u003cbr\u003eOil and gas, power generation, and industrial rotating machinery applications.\u003c\/p\u003e","brand":"Bently Nevada","offers":[{"title":"Default Title","offer_id":52668301672811,"sku":"991-25-70-01-CN","price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0953\/3227\/0443\/files\/991-25-70-01-CN-p3q31sowur5_71146f97-f12b-4430-9a6f-1ccb5ce0c52c.jpg?v=1765520558","url":"https:\/\/www.plcprotech.com\/products\/991-25-70-01-cn-bently-nevada-991-thrust-transmitter","provider":"PLC ProTech Ltd.","version":"1.0","type":"link"}