{"product_id":"bently-nevada-991-25-70-01-01-thrust-transmitter-4-20ma","title":"Bently Nevada 991-25-70-01-01 Thrust Transmitter | 4-20mA","description":"\u003ch3\u003eProduct Overview\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003eBently Nevada\u003c\/strong\u003e \u003cstrong\u003e991-25-70-01-01\u003c\/strong\u003e \u003cstrong\u003e991 Series\u003c\/strong\u003e Probe Vibration Transmitter delivers reliable, continuous measurement of axial shaft position in critical rotating machinery. Designed specifically for industrial automation environments, this 2-wire loop-powered unit translates non-contacting proximity probe inputs into a standard industrial control signal. Engineered and manufactured in the United States, the unit guarantees high operational integrity for machinery protection systems.\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications \u0026amp; MECE Classification\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand \u0026amp; Model:\u003c\/strong\u003e \u003cstrong\u003eBently Nevada\u003c\/strong\u003e \u003cstrong\u003e991-25-70-01-01\u003c\/strong\u003e (\u003cstrong\u003e991 Series\u003c\/strong\u003e)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeasurement Range \u0026amp; Linear Range:\u003c\/strong\u003e Full-scale option features 25-0-25 mils, supporting linear ranges of 0.6-0-0.6 mm or 25-0-25 mils with a linear range of 0.25 to 1.65 mm for Prox Out.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSensitivity \u0026amp; Accuracy:\u003c\/strong\u003e 4 to 20 mA loop accuracy remains within plus or minus 1.5% over the specified full-scale range under typical operating conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFrequency Response \u0026amp; Signal Characteristics:\u003c\/strong\u003e Current limiting is set at 23 mA typical with a maximum loop resistance of 1,000 ohms at 35 Vdc. The unit features non-interacting external zero and span adjustments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResolution \u0026amp; Diagnostics:\u003c\/strong\u003e Not OK\/Signal Defeat logic drops output below 3.6 mA within 100 microseconds during fault conditions and restores output within 0.1 seconds after fault removal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature Range \u0026amp; Environmental Tolerances:\u003c\/strong\u003e Transmitter operating temperature spans from minus 35 degrees Celsius to plus 85 degrees Celsius, while storage temperature ranges from minus 51 degrees Celsius to plus 100 degrees Celsius.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInterference Immunity \u0026amp; Power:\u003c\/strong\u003e Requires plus 12 to plus 35 Vdc input power at the transmitter terminal in a 2-wire configuration.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePhysical \u0026amp; Mechanical Parameters:\u003c\/strong\u003e Weighs 0.43 kg (0.9 lbm). Features Polyphenylene sulfide transducer tip material, AISI 303 or 304 stainless steel case, and a 75-ohm coaxial probe cable.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eInstallation \u0026amp; Commissioning Guide\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSecure the transmitter directly onto standard 35 mm DIN-rail clips inside the industrial cabinet.\u003c\/li\u003e\n\u003cli\u003eConnect one non-contacting 3300 NSv proximity probe and its matching extension cable to the designated input terminals.\u003c\/li\u003e\n\u003cli\u003eVerify that the 2-wire loop power supply provides between plus 12 and plus 35 Vdc with total loop resistance under 1,000 ohms.\u003c\/li\u003e\n\u003cli\u003eAdjust the non-interacting external zero and span potentiometers carefully during initial system calibration.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eMaintenance \u0026amp; Operational Usability\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eThe modular DIN-rail setup allows rapid physical replacement without complicated mounting procedures.\u003c\/li\u003e\n\u003cli\u003eExternal zero and span controls permit field calibration without requiring proprietary configuration software.\u003c\/li\u003e\n\u003cli\u003eBuilt-in Not OK signal defeat circuitry automatically flags probe failures or open circuits to protect the control loop.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCompatibility \u0026amp; System Integration\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eFully compatible with \u003cstrong\u003eBently Nevada\u003c\/strong\u003e 3300 NSv proximity probes and associated extension cables.\u003c\/li\u003e\n\u003cli\u003eInterfaces smoothly with standard distributed control systems or programmable logic controllers accepting 4-20 mA current loops.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCertifications \u0026amp; Compliance\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCSA Division 2 hazardous area approval for safe deployment in volatile industrial sectors.\u003c\/li\u003e\n\u003cli\u003eComplies with rigorous industrial manufacturing standards and carries a comprehensive 12-month service warranty.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003ePackage Contents \u0026amp; Logistics\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eIncludes the \u003cstrong\u003eBently Nevada\u003c\/strong\u003e \u003cstrong\u003e991-25-70-01-01\u003c\/strong\u003e transmitter unit, 35 mm DIN-rail clips, and technical documentation.\u003c\/li\u003e\n\u003cli\u003eShipped securely via FedEx, UPS, or DHL with rapid 24-48 hour dispatch schedules.\u003c\/li\u003e\n\u003cli\u003eBacked by a full 12-month operational warranty.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTypical Applications \u0026amp; Diagnostic Capabilities\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eMonitors axial thrust displacement on centrifugal air compressors, industrial pumps, large motors, and fans.\u003c\/li\u003e\n\u003cli\u003eProvides early warning diagnostics for thrust bearing wear, preventing catastrophic machinery failures in oil, gas, and power generation plants.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSelection Comparison \u0026amp; Technical Guidance\u003c\/h3\u003e\n\u003cp\u003eWhen evaluating alternative configurations, consider the \u003ca href=\"https:\/\/www.plcsparehub.com\/products\/991-25-70-03-00-bently-nevada-thrust-transmitter-4-20ma-vibration-monitor\"\u003e991-25-70-03-00\u003c\/a\u003e model if your installation layout requires different mounting clips or hardware options. Engineering teams should match the system length option (such as the 7.0-meter cable option on the \u003cstrong\u003e991-25-70-01-01\u003c\/strong\u003e) precisely with physical probe placement to prevent signal attenuation.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What causes the transmitter output to drop below 3.6 mA?\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e The Not OK\/Signal Defeat circuit triggers this drop within 100 microseconds if it detects a severed probe cable, power loss, or internal sensor fault.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can I adjust the zero and span settings in the field?\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Yes, the device features non-interacting external adjustments that allow calibration technicians to tune the 4-20 mA output directly on the DIN rail.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What is the maximum allowable cable resistance for the 4-20 mA loop?\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e The maximum loop resistance is 1,000 ohms, which includes the total wiring resistance when operating at 35 Vdc.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0722\/7863\/8774\/files\/991_524659a5-cbca-478a-b812-374d1b70ec8e.png?v=1784875246\" alt=\"\"\u003e\u003c\/p\u003e","brand":"Bently Nevada","offers":[{"title":"Default Title","offer_id":45013972222134,"sku":"991-25-70-01-01","price":133.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0722\/7863\/8774\/files\/991_2.jpg?v=1784875460","url":"https:\/\/www.plcsparehub.com\/products\/bently-nevada-991-25-70-01-01-thrust-transmitter-4-20ma","provider":"Global PLC Spare Hub","version":"1.0","type":"link"}