{"product_id":"bently-nevada-991-01-xx-01-01-mod-284318-01-991-thrust-transmitter","title":"Bently Nevada 991-01-XX-01-01 MOD:284318-01 Transmetteur de poussée 991","description":"\u003cp\u003eThe \u003cstrong\u003eBently Nevada 991-01-XX-01-00\u003c\/strong\u003e (\u003cstrong\u003eMOD:284318-01\u003c\/strong\u003e) is a high-reliability, loop-powered 2-wire thrust displacement transmitter designed to process eddy-current proximity probe signals into a continuous 4-20 mA current output. Operating over a specialized current loop range of 1.0 - 0 - 1.0 mm (correlating directly to a 4-20 mA span), this instrument delivers raw axial position monitoring directly to control systems like PLCs or DCS without requiring an intervening monitor rack. The device is factory-calibrated for a 9-meter 3300 XL 5mm\/8mm proximity transducer system observing AISI 4140 steel targets. By integrating proximity sensor technology with standard loop-powered transmitter architecture, it translates micro-inch physical shaft shifts into proportional analog signals, while offering an isolated PROX OUT dynamic terminal for rotor dynamics diagnostics and gap voltage auditing via external vibration analyzers.\u003c\/p\u003e\n\u003ch3\u003eHardware Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd data-row=\"1\"\u003e\u003cstrong\u003eParameter\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-row=\"1\"\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-row=\"2\"\u003e\u003cstrong\u003eTransmitter Architecture\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-row=\"2\"\u003eCustom 2-wire loop-powered axial thrust transmitter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-row=\"3\"\u003e\u003cstrong\u003eBase Model Series\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-row=\"3\"\u003eBently Nevada 991 Vibration\/Thrust Series\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-row=\"4\"\u003e\u003cstrong\u003eModification Code\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-row=\"4\"\u003eMOD: 284318-01\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-row=\"5\"\u003e\u003cstrong\u003eCurrent Loop Power Input\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-row=\"5\"\u003e+12 VDC to +35 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-row=\"6\"\u003e\u003cstrong\u003eAnalog Current Loop Range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-row=\"6\"\u003e4-20 mA linear output\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-row=\"7\"\u003e\u003cstrong\u003ePhysical Measuring Window\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-row=\"7\"\u003e1.0 mm - 0 mm - 1.0 mm directional thrust displacement\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-row=\"8\"\u003e\u003cstrong\u003eProximity Sensing Range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-row=\"8\"\u003e10 mils to 90 mils\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-row=\"9\"\u003e\u003cstrong\u003eElectrical Zero Baseline\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-row=\"9\"\u003e2.5 VDC @ 20 mils gap voltage\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-row=\"10\"\u003e\u003cstrong\u003eRaw Signal Scale Factor\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-row=\"10\"\u003e140 mV\/mil (via PROX OUT terminal)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-row=\"11\"\u003e\u003cstrong\u003eTransducer System Compatibility\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-row=\"11\"\u003e3300 XL 5mm or 8mm proximity probe system\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-row=\"12\"\u003e\u003cstrong\u003eSystem Electrical Length\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-row=\"12\"\u003e9 meters continuous matching configuration\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-row=\"13\"\u003e\u003cstrong\u003eTarget Material Calibration\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-row=\"13\"\u003eAISI 4140 steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-row=\"14\"\u003e\u003cstrong\u003eDynamic Signal Interface\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-row=\"14\"\u003eNon-isolated terminal blocks (COM \/ PROX OUT)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-row=\"15\"\u003e\u003cstrong\u003eEnclosure Mounting Profile\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-row=\"15\"\u003eStandard 35 mm DIN rail or surface flange installation\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-row=\"16\"\u003e\u003cstrong\u003eElectrical Interface Terminals\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-row=\"16\"\u003eScrew-clamp terminal block strip for reliable field wiring\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-row=\"17\"\u003e\u003cstrong\u003eOperating Temperature\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-row=\"17\"\u003e-40 °C to +80 °C (-40 °F to +176 °F)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-row=\"18\"\u003e\u003cstrong\u003eStorage Temperature\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-row=\"18\"\u003e-40 °C to +100 °C (-40 °F to +212 °F)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-row=\"19\"\u003e\u003cstrong\u003eRelative Humidity Limits\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-row=\"19\"\u003e95% maximum, non-condensing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-row=\"20\"\u003e\u003cstrong\u003eHazardous Area Approvals\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-row=\"20\"\u003eVaries by specific -XX option code (Ex ia \/ Class I Div 1 compatible)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eEngineering Notes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDynamic Monitoring Safety:\u003c\/strong\u003e The PROX OUT terminal provides direct access to the raw eddy-current transducer gap voltage signal. Connecting grounded AC-powered test equipment directly to this terminal without isolation will alter the loop impedance, corrupting the 4-20 mA analog transmission and potentially triggering false machinery shutdown alarms.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eScale Factor Deviations:\u003c\/strong\u003e The transmitter is calibrated specifically for a scale factor of 140 mV\/mil when working with a 3300 XL 5mm\/8mm system. Mismatching the system length (e.g., combining a 5-meter cable with a 9-meter transmitter) will invalidate the linear current output tracking.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eElectrical Zero Adjustments:\u003c\/strong\u003e Ensure that during mechanical installation, the probe is physically gapped near the electrical zero point of 2.5 VDC @ 20 mils to allow equal, proportional travel tracking in both the positive and negative thrust directions.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eField Guidelines\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest Adapter Requirements:\u003c\/strong\u003e For routine loop verification or portable data collector hookups, always insert the specialized Bently Nevada 122115-01 test adapter between the terminal block and any AC-powered diagnostic equipment to maintain loop safety isolation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLoop Cable Routing:\u003c\/strong\u003e Use twisted, shielded pairs (minimum 18 AWG) for the positive and negative current loop wiring. Terminate the outer shield neatly at the control cabinet ground rail, keeping it completely ungrounded and floating at the transmitter field junction box.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTerminal Integrity:\u003c\/strong\u003e Secure the top screw terminals using proper torque metrics. Prevent uninsulated wire exposure to mitigate short circuits between the current loop inputs and the sensitive proximity interface terminals.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTechnical \u0026amp; Procurement FAQ\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQuestion: What does the \"XX\" indicate within the 991-01-XX-01-00 part number format?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eAnswer: The \"XX\" is a variable variable selection position code that designates specific international agency hazardous area certifications (such as ATEX, CSA, or FM approvals) for intrinsic safety or non-incendive field installations.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQuestion: How is the physical direction of axial thrust displacement mapped onto the 4-20 mA loop profile?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eAnswer: The transmitter tracks displacement bi-directionally over a 1.0 - 0 - 1.0 mm mechanical span. The electrical zero parameter of 2.5 VDC at 20 mils acts as the center-point baseline, allowing the current loop to modulate scale tracking linearly up and down relative to rotor movement.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQuestion: Can a generic 3-wire proximity sensor extension cable be spliced into the 9-meter system network?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eAnswer: No. Splicing or modifying proximity probe extension leads alters the internal coaxial capacitance and overall system impedance. This compromises the 140 mV\/mil raw scale factor calibration and introduces signal drift errors into the 4-20 mA tracking loops.\u003c\/p\u003e","brand":"Bently Nevada","offers":[{"title":"Default Title","offer_id":52666856800619,"sku":"991-01-XX-01-01 MOD:284318-01","price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0953\/3227\/0443\/files\/bently-nevada-991-01-xx-01-01-mod-284318-01-991-thrust-transmitter-xtwdmqajyqf_693a4cf6-2c77-486e-b9e4-f9a47cd7290f.jpg?v=1765449197","url":"https:\/\/www.plcprotech.com\/fr\/products\/bently-nevada-991-01-xx-01-01-mod-284318-01-991-thrust-transmitter","provider":"PLC ProTech Ltd.","version":"1.0","type":"link"}