{"product_id":"bently-nevada-991-25-50-01-01-991-thrust-transmitter","title":"Bently Nevada 991-25-50-01-01 991 Thrust Transmitter","description":"\u003ch3\u003eDescription\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003eBently Nevada 991-25-50-01-01\u003c\/strong\u003e is a two-wire, loop-powered \u003cstrong\u003ethrust transmitter\u003c\/strong\u003e designed to measure the relative axial position of a rotating machine shaft. It accepts input directly from a \u003cstrong\u003e3300 NSv proximity probe\u003c\/strong\u003e and extension cable, transforming the proximity signal into a proportional 4 to 20 mA current output. This device integrates directly with Programmable Logic Controllers (PLCs), Distributed Control Systems (DCSs), and SCADA networks to provide continuous machinery protection and condition monitoring. Typical industrial applications include centrifugal air compressors, small pumps, motors, and fans with fluid-film thrust bearings where a full machinery protection system monitor rack is not required.\u003c\/p\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eTwo-wire, 4 to 20 mA loop-powered current output\u003c\/li\u003e\n\u003cli\u003eDesigned for non-contacting shaft axial displacement measurement\u003c\/li\u003e\n\u003cli\u003eCompatible with \u003cstrong\u003e3300 NSv proximity probe\u003c\/strong\u003e and extension cable\u003c\/li\u003e\n\u003cli\u003eIntegrated BNC connector for dynamic vibration signal access and diagnostics\u003c\/li\u003e\n\u003cli\u003eDIN rail or panel mounting configurations\u003c\/li\u003e\n\u003cli\u003eNon-interacting zero and span adjustments\u003c\/li\u003e\n\u003cli\u003ePotted construction for high humidity environments up to 100% condensing\u003c\/li\u003e\n\u003cli\u003eNot OK\/Signal Defeat circuit to prevent false alarms due to faulty proximity probes or loose connections\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\u003eProcess pumps and industrial motors\u003c\/li\u003e\n\u003cli\u003eSteam and gas turbines\u003c\/li\u003e\n\u003cli\u003eElectric motors with thrust bearings\u003c\/li\u003e\n\u003cli\u003eCooling tower fans and blowers\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\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\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\u003eFull-scale Option: 25-0-25 mils\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e50\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSystem Length Option: 5.0 meters (16.4 feet)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e01\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMounting Option: 35 mm DIN-rail clips\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e01\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eAgency Approval Option: CSA Division 2\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\u003eCategory\u003c\/strong\u003e\u003c\/th\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\u003e\u003cstrong\u003eManufacturer\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eBently Nevada\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOrigin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCountry of Origin\u003c\/td\u003e\n\u003ctd\u003eUnited States\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePhysical\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eApproximate Weight\u003c\/td\u003e\n\u003ctd\u003e0.43 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e \u003c\/td\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 (2.10 in x 2.91 in x 3.94 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e \u003c\/td\u003e\n\u003ctd\u003eBody Height (without DIN clip)\u003c\/td\u003e\n\u003ctd\u003e42.6 mm (1.68 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e \u003c\/td\u003e\n\u003ctd\u003eMounting Hole Distance (Width x Length)\u003c\/td\u003e\n\u003ctd\u003e63.5 mm x 69.9 mm (2.50 in x 2.75 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e \u003c\/td\u003e\n\u003ctd\u003eMounting Hole Diameter\u003c\/td\u003e\n\u003ctd\u003e5.8 mm (0.23 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eElectrical\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eInput Voltage Range\u003c\/td\u003e\n\u003ctd\u003e12 to 35 Vdc (at the transmitter terminal block)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e \u003c\/td\u003e\n\u003ctd\u003eCurrent Output\u003c\/td\u003e\n\u003ctd\u003e4 to 20 mA (Linear over 50 mils range)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e \u003c\/td\u003e\n\u003ctd\u003eLoop Accuracy\u003c\/td\u003e\n\u003ctd\u003eWithin ±1.5% over specified full-scale range\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e \u003c\/td\u003e\n\u003ctd\u003eMaximum Loop Resistance\u003c\/td\u003e\n\u003ctd\u003e1000 ohms including cable at 35 Vdc\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e \u003c\/td\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\u003e\u003cstrong\u003eDynamic\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFrequency Response\u003c\/td\u003e\n\u003ctd\u003eDC to 10 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e \u003c\/td\u003e\n\u003ctd\u003eBNC Connector Output\u003c\/td\u003e\n\u003ctd\u003eRaw proximity probe voltage buffered (Nominal 200 mV\/mil)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e \u003c\/td\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\u003e\u003cstrong\u003eEnvironmental\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eOperating Temperature\u003c\/td\u003e\n\u003ctd\u003e-35 to +85 Celsius\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e \u003c\/td\u003e\n\u003ctd\u003eStorage Temperature\u003c\/td\u003e\n\u003ctd\u003e-51 to +100 Celsius\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e \u003c\/td\u003e\n\u003ctd\u003eRelative Humidity\u003c\/td\u003e\n\u003ctd\u003e100% condensing, non-submerged\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\u003eTerminal \/ Connector\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\u003ePROX\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eProximity Probe Input Terminal Connection\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCOM\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSignal Common \/ System Ground\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e+4-20mA\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePositive Loop Power \/ Current Output Terminal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e-4-20mA\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNegative Loop Power \/ Current Output Terminal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBNC\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDynamic Signal Output (Buffered Proximity Voltage)\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\u003ch3\u003eDimensions and Mounting\u003c\/h3\u003e\n\u003cp\u003eThe module accommodates both panel (bulkhead) and DIN rail mounting options. When using the panel mount configuration, prepare four mounting holes with a spacing layout of 63.5 mm (width) by 69.9 mm (length). Use the standard 5.8 mm diameter mounting holes or the supplied 6-32 x 1.326 screws for secure bulkhead fixation. For DIN rail configurations, ensure a standard 35 mm DIN rail is rigidly installed before snapping on the transmitter's DIN mount clips.\u003c\/p\u003e\n\u003ch3\u003eGrounding and Shielding\u003c\/h3\u003e\n\u003cp\u003eProper grounding is essential to minimize noise interference. The transmitter must be mounted to a grounded plate or a grounded DIN rail. Ensure the cable shield is grounded at only one end, typically at the control room\/DCS side, to prevent ground loops.\u003c\/p\u003e\n\u003ch3\u003eProbe Gap Adjustment\u003c\/h3\u003e\n\u003cp\u003eBefore final commissioning, the proximity probe must be physically positioned (gapped) relative to the shaft target. Adjust the gap until the transmitter output reads approximately 12 mA, which corresponds to the midpoint of the linear thrust range (0 mils).\u003c\/p\u003e\n\u003ch3\u003eCable Routing\u003c\/h3\u003e\n\u003cp\u003eRun probe and loop cables in dedicated, grounded metal conduits or cable trays. Avoid routing transmitter cables parallel to high-voltage AC power lines or heavy machinery switching circuits to prevent electro-magnetic interference (EMI).\u003c\/p\u003e\n\u003ch3\u003eHazardous Area Precautions\u003c\/h3\u003e\n\u003cp\u003eWhen installed in classified areas, appropriate intrinsic safety barriers or explosion-proof housings must be utilized in accordance with local electrical codes and the specific installation drawings provided by the manufacturer.\u003c\/p\u003e\n\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the primary function of this thrust transmitter?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eIt measures the axial displacement or thrust position of a rotating machine shaft relative to a fixed reference point using a non-contacting proximity probe.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat type of probe system is compatible with this transmitter?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eIt is designed specifically to interface with a Bently Nevada 3300 NSv proximity probe and extension cable system.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow is the device powered?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eIt is a loop-powered device operating on a 12 to 35 Vdc supply connected via the 4 to 20 mA current loop.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does the BNC connector provide?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe BNC connector provides a buffered raw voltage signal proportional to the probe gap distance, allowing engineers to connect diagnostic equipment like oscilloscopes or analyzers without disconnecting the loop.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan this device be used for radial vibration measurements?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo, this specific model is configured and calibrated for thrust (axial) position measurement. For radial vibration, a 990 Vibration Transmitter should be used.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the function of the Not OK\/Signal Defeat circuit?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe circuit forces the signal output to drop below 3.6 mA within 100 microseconds of a probe fault or loose connection to prevent false alarms in the control system.\u003c\/p\u003e","brand":"Bently Nevada","offers":[{"title":"Default Title","offer_id":52666746962283,"sku":"991-25-50-01-01","price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0953\/3227\/0443\/files\/bently-nevada-991-25-50-01-01-thrust-transmitter-apzkr42z0zt_98ab5da5-7e2f-4c22-ba5c-ac12cefa8949.jpg?v=1765446967","url":"https:\/\/www.plcprotech.com\/products\/bently-nevada-991-25-50-01-01-991-thrust-transmitter","provider":"PLC ProTech Ltd.","version":"1.0","type":"link"}