{"product_id":"bently-nevada-991-25-50-02-00-991-thrust-transmitter","title":"Bently Nevada 991-25-50-02-00 991 Thrust Transmitter","description":"\u003ch3\u003eDescription\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003e991-25-50-02-00\u003c\/strong\u003e processed signal transmitter is designed to accept inputs from a proximity probe and sensor system to monitor micro-inch level axial shaft movement, specifically orients as a \u003cstrong\u003e991 Thrust Transmitter\u003c\/strong\u003e. This device functions as a self-contained, two-wire loop-powered transmitter that converts proximity probe measurements directly into a 4 to 20 mA current output proportional to the total thrust displacement. It integrates seamlessly with standard Programmable Logic Controllers (\u003cstrong\u003ePLC\u003c\/strong\u003e), Distributed Control Systems (\u003cstrong\u003eDCS\u003c\/strong\u003e), and Safety Instrumented Systems (\u003cstrong\u003eSIS\u003c\/strong\u003e), allowing operators to establish thrust monitoring without the requirement of a dedicated rack-based Machinery Protection System. The transmitter provides continuous machinery protection for rotating equipment including centrifugal compressors, steam turbines, pumps, and industrial fans.\u003c\/p\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eIntegrates a non-contacting eddy current proximity probe sensor input into a standard 2-wire 4 to 20 mA loop interface.\u003c\/li\u003e\n\u003cli\u003eProvides a buffered voltage output via a dedicated BNC connector for direct connection to portable vibration analyzers and diagnostic instrumentation.\u003c\/li\u003e\n\u003cli\u003eOffers specialized circuitry for early detection of thrust bearing wear or potential catastrophic axial float failure.\u003c\/li\u003e\n\u003cli\u003eFeatures a rugged, compact housing design compatible with high-density DIN rail mounting configurations.\u003c\/li\u003e\n\u003cli\u003eContains built-in circuit protection against reverse polarity and electrical surge anomalies.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAxial displacement and thrust position monitoring on high-speed centrifugal compressors.\u003c\/li\u003e\n\u003cli\u003eBoiler feed pump thrust bearing wear tracking in power generation utilities.\u003c\/li\u003e\n\u003cli\u003eSteam and gas turbine rotor axial position surveillance.\u003c\/li\u003e\n\u003cli\u003eIndustrial turbocharger and expander mechanical health monitoring.\u003c\/li\u003e\n\u003cli\u003eLarge electric motor and gear reducer shaft displacement tracking.\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\u003e\u003cstrong\u003eOption Code\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eSelection Type\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eDescription\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e991\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eThrust Transmitter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e25\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eProximity Probe Option\u003c\/td\u003e\n\u003ctd\u003e3300 XL 8mm Proximity Probe\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e50\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eScale Range Option\u003c\/td\u003e\n\u003ctd\u003e50-0-50 mils Range\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e02\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eAgency Approval Option\u003c\/td\u003e\n\u003ctd\u003eMultiple Approvals (ATEX, IECEx, CSA)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e00\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMounting Option\u003c\/td\u003e\n\u003ctd\u003eStandard Mounting Option\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\u003e\u003cstrong\u003eParameter Category\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eSpecification Details\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eManufacturer\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBently Nevada\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e991-25-50-02-00\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eProduct Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e991 Thrust Transmitter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOrigin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUnited States\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInput Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3300 XL 8mm Proximity Probe and Extension Cable System\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOutput Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e4 to 20 mA DC (Linear proportional to thrust displacement)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePower Requirements\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e12 to 35 VDC at the transmitter terminals\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eLoop Resistance\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMaximum 1000 Ohms at 35 VDC supply voltage\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBuffered Output\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCoaxial BNC connector, nominal output scale factor matching the proximity sensor\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAccuracy\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eWithin specified linear range across standard operating temperatures\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOperating Temperature\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e-35 degC to +85 degC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eStorage Temperature\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e-40 degC to +100 degC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMounting\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e35mm DIN rail or direct panel mount plate\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDimensions\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e81.3 mm x 61.2 mm x 103.4 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0.45 kg\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\u003e\u003cstrong\u003eConnector Pin\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eFunction\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e+4-20 mA\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePositive Loop Power \/ Current Output Connection\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e-4-20 mA\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNegative Loop Power \/ Current Output Return\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePROBE\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCenter Conductor for Proximity Probe Extension Cable Input\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSHIELD\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eTerminal Connection for Extension Cable Shield\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCOM\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCommon Reference Point for Signal Testing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBNC Jack\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDynamic Voltage Output (Raw Proximity Sensor Signal)\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\u003e\n\u003cstrong\u003eDIN Rail Installation:\u003c\/strong\u003e Snap the housing onto standard 35mm symmetric top-hat DIN rails, ensuring both the top and bottom clips engage securely.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGrounding:\u003c\/strong\u003e Connect the transmitter housing directly to the local instrumentation clean ground or DIN rail ground block to avoid floating potentials.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShielding:\u003c\/strong\u003e Terminate the outer shield of the field wiring cable at the control system end only; ensure the probe cable shield is connected directly to the designated transmitter shield terminal and isolated from the junction box.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEMI\/RFI Mitigation:\u003c\/strong\u003e Route all low-level proximity sensor input cables in dedicated grounded metallic conduits separated from heavy AC power distribution wiring.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProbe Gap Adjustment:\u003c\/strong\u003e Ensure the proximity probe is gapped to the correct physical voltage range before securing the transmitter loop configuration to maximize dynamic linear performance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMoisture Protection:\u003c\/strong\u003e Install the device within an IP65 or NEMA 4X rated enclosure when deploying into outdoor, high-humidity, or corrosive ambient environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCompliance and Certifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCSA\/NRTL\/C\u003c\/li\u003e\n\u003cli\u003eATEX\u003c\/li\u003e\n\u003cli\u003eIECEx\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the primary function of this transmitter?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eIt converts high-frequency proximity probe signals into a standard linear 4 to 20 mA loop-current signal representing shaft axial or thrust position.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this device require a separate power supply line?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo, it is a two-wire, loop-powered device that operates using the loop voltage provided by the receiving DCS or PLC analog input module.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow is a portable data collector connected to check raw vibration data?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA portable analyzer or oscilloscope can be connected directly to the front-panel BNC jack without disturbing the 4 to 20 mA automation control loop.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat specific proximity sensor system is compatible with the 25 option code?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe 25 option designates compatibility with the Bently Nevada 3300 XL 8mm proximity probe and extension cable system.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan this unit be mounted directly inside a harsh outdoor environment?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eIt requires an appropriately rated protective enclosure to safeguard its electronic terminal blocks from moisture, dust, and corrosive airborne elements.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the impact of reversing the input loop polarity?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe unit features internal reverse polarity protection circuits that prevent electrical damage, though it will not transmit a valid signal until wired correctly.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this module require routine calibration in the field?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo, the device is factory-calibrated to specific linear ranges and does not require adjustment or manual potentiometer tuning during standard installation.\u003c\/p\u003e","brand":"Bently Nevada","offers":[{"title":"Default Title","offer_id":52666565624171,"sku":"991-25-50-02-00","price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0953\/3227\/0443\/files\/bently-nevada-991-25-50-02-00-thrust-transmitter-omubwe2j10e_9be2c544-1e3f-4c84-9fe9-07d1aa5c49ac.jpg?v=1765440731","url":"https:\/\/www.plcprotech.com\/products\/bently-nevada-991-25-50-02-00-991-thrust-transmitter","provider":"PLC ProTech Ltd.","version":"1.0","type":"link"}