{"product_id":"bently-nevada-991-25-50-01-00-thrust-transmitter","title":"Bently Nevada 991-25-50-01-00 Thrust Transmitter","description":"\u003ch3\u003eProduct Overview\u003c\/h3\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e991-25-50-01-00\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eis a high-precision, loop-powered device engineered to provide a continuous 4-20 mA output proportional to axial shaft position. As a critical component of the Bently Nevada 991 series, this\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e991-25-50-01-00\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003etransmitter is designed to integrate seamlessly with PLCs or DCS units for machinery protection without requiring a separate monitor rack. It is widely utilized in hydro-electric plants, reciprocating compressors, and industrial gearbox monitoring to detect thrust bearing wear and prevent rotor-to-stator contact. By delivering real-time axial displacement data, this transmitter enables predictive maintenance strategies that protect multi-million dollar assets from catastrophic failure, effectively reducing unplanned downtime and enhancing operational safety in demanding industrial environments.\u003c\/p\u003e\n\u003ch3\u003eSuffix Breakdown\u003c\/h3\u003e\n\u003cp\u003eThe technical configuration of the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e991-25-50-01-00\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eis defined by the following specific options:\u003c\/p\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e25 (Full-scale Option):\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eConfigured for a measurement range of 25-0-25 mils (standard thrust range).\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e50 (System Length Option):\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eCalibrated for use with a 5.0 meter (16.4 feet) total system length (probe plus extension cable).\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e01 (Mounting Option):\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eSupplied with 35 mm DIN-rail clips for standardized cabinet installation.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e00 (Agency Approval Option):\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eStandard version; no specific hazardous area approvals required for the installation site.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr class=\"firstRow\"\u003e\n\u003ctd\u003e\u003cstrong\u003eAttribute\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eSpecification Details\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e991-25-50-01-00\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eBently Nevada (Baker Hughes)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eOrigin\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eU.S.A.\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eOutput Signal\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e4-20 mA DC\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eMeasurement Range\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e25-0-25 mils\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eSystem Length\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e5.0 meters\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eMounting\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e35 mm DIN-rail\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eOperating Temp\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e-35 to +85 deg C\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eSupply Voltage\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e12 to 35 VDC\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eShipping Weight\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e2.0 kg\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eOperations \u0026amp; Maintenance FAQs\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eCan I use a 7.0-meter cable with this transmitter?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. The\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e991-25-50-01-00\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eis specifically factory-calibrated for a 5.0-meter system length (Option 50). Using a different cable length will result in significant measurement errors and non-linearity in the 4-20 mA output.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat happens if the probe signal is lost?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe transmitter includes \"Not-OK\" status logic. If the input signal from the proximity probe falls outside the valid range (e.g., due to a broken cable), the 4-20 mA output will typically drop below 3.6 mA, allowing the control system to distinguish between a thrust alarm and a transducer failure.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this unit require a Proximitor?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. The 991 series Thrust Transmitter combines the functions of a Proximitor and a signal conditioner into a single unit, providing a direct 4-20 mA interface for your PLC\/DCS.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eEngineering \u0026amp; Installation Guide\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eAxial Gap Calibration and Zeroing\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eWhen installing the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e991-25-50-01-00\u003c\/strong\u003e, the proximity probe must be gapped while the shaft is in a known axial position (usually against the active thrust shoe). The transmitter is calibrated so that the center of the 4-20 mA range (12 mA) represents the \"Zero\" position. Ensure the probe is positioned within its linear range—typically indicated by a specific DC voltage at the \"Prox Out\" terminals—before finalizing the mechanical installation.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWiring and Shielding Protocols\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eTo ensure signal integrity in high-EMI industrial environments, use shielded twisted-pair cabling for the 4-20 mA loop. The shield should be terminated at the instrument ground of the control system (DCS\/PLC) only. Avoid grounding the shield at both ends to prevent ground loops, which can cause signal drift or \"ghost\" alarms in the thrust readings.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThermal Considerations and Enclosure\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eWhile the unit is rated for operation up to 85 deg C, localized heating inside control cabinets can exceed these limits. Ensure the DIN-rail mounting area has adequate ventilation. For installations in extremely corrosive or humid environments, the transmitter should be housed in a secondary NEMA 4X or IP66 rated enclosure to protect the terminal connections from oxidation.\u003c\/p\u003e","brand":"Bently Nevada","offers":[{"title":"Default Title","offer_id":52668321726827,"sku":"991-25-50-01-00","price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0953\/3227\/0443\/files\/991-25-50-01-00-ik0hsfwm0cz_99cf8fd8-4e55-413b-a0a4-c019a3817d3d.jpg?v=1765521168","url":"https:\/\/www.plcprotech.com\/products\/bently-nevada-991-25-50-01-00-thrust-transmitter","provider":"PLC ProTech Ltd.","version":"1.0","type":"link"}