{"product_id":"991-25-50-01-05-bently-nevada-990-991-series-thrust-transmitter","title":"991-25-50-01-05 Bently Nevada 990\/991 Series Thrust Transmitter","description":"\u003cp\u003eThe \u003cstrong\u003eBently Nevada 991-25-50-01-05\u003c\/strong\u003e serves as the primary \u003cstrong\u003e991\u003c\/strong\u003e Thrust Transmitter utilized to execute axial displacement monitoring functions across machinery protection platforms. The instrument operates as a two-wire, loop-powered hardware component that conditions analog proximity signals into a proportional 4-20 mA DC linear output, allowing direct tracking of counter-directional shaft movement without requiring separate monitoring racks.\u003c\/p\u003e\n\u003ch3\u003eOption Code Matrix Breakdown\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e991\u003c\/strong\u003e: Base series code designating the integrated proximity axial position (thrust) transmitter framework.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e25\u003c\/strong\u003e: Full-scale measurement range option calibrated for 25-0-25 mils (approximately 0.6-0-0.6 mm) centered zero tracking.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e50\u003c\/strong\u003e: Calibrated total system length parameter optimized for a 5.0 meter (16.4 feet) probe and extension cable matching matrix.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e01\u003c\/strong\u003e: Mechanical hardware installation variation supplying factory 35 mm DIN-rail mounting clips.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e05\u003c\/strong\u003e: Comprehensive agency approval package specifying CSA Division 2, ATEX Zone 0, ATEX Zone 2, and embedded ABS maritime registration.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHardware Parameter Formats\u003c\/h3\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\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\u003eModel\u003c\/td\u003e\n\u003ctd\u003e991-25-50-01-05\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eBently Nevada\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eUSA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.5 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShipping Dimensions\u003c\/td\u003e\n\u003ctd\u003e10.0 x 7.4 x 6.0 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temperature\u003c\/td\u003e\n\u003ctd\u003e-40 to +80 deg C (Standard industrial enclosure rating)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003eLoop-powered (4-20 mA loop input, typical current limiting at 23 mA)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSystem Target Material\u003c\/td\u003e\n\u003ctd\u003eAISI 4140 steel standard calibration reference\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Device Match\u003c\/td\u003e\n\u003ctd\u003e3300 NSv proximity probe and matching extension cable assembly\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAnalog Signal Loop\u003c\/td\u003e\n\u003ctd\u003eProportional 4-20 mA DC industrial standard output\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDynamic Signal Output\u003c\/td\u003e\n\u003ctd\u003eNon-isolated BNC coaxial port (PROX OUT) and auxiliary terminal blocks\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiagnostic Telemetry\u003c\/td\u003e\n\u003ctd\u003eRaw dynamic vibration data and baseline gap voltage levels\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCalibration Interface\u003c\/td\u003e\n\u003ctd\u003eNon-interacting zero and span adjustment potentiometers\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProtection Safeguard\u003c\/td\u003e\n\u003ctd\u003eIntegrated Power-up Inhibit circuit suppressing voltage transient errors\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVerification Port\u003c\/td\u003e\n\u003ctd\u003eDedicated test input pin for auxiliary DC signal injection\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTariff Code\u003c\/td\u003e\n\u003ctd\u003e8537101190\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eEddy-Current Probe Scaling \u0026amp; Vibration Signal Processing\u003c\/h3\u003e\n\u003cp\u003eThe 991-25-50-01-05 relies on continuous eddy-current probe scaling matrices to track high-frequency voltage fluctuations induced by axial shaft shifting. The internal processing network translates changes in the RF magnetic field generated by the 3300 NSv probe into exact engineering units, validating gap voltage validation (-10 VDC targets) across the positive and negative measurement displacement windows. To protect signal path accuracy during intense rotor dynamics events, the hardware enforces high cross-talk suppression along the loop, feeding an unattenuated dynamic wave to the PROX OUT coaxial port while keeping the primary protection logic free from line voltage switching noise through an internal Power-up Inhibit circuit block.\u003c\/p\u003e\n\u003ch3\u003eProcurement Document Contents\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e1 x 991-25-50-01-05 Thrust Transmitter Unit\u003c\/li\u003e\n\u003cli\u003e2 x Factory-installed 35 mm DIN-rail mounting clips\u003c\/li\u003e\n\u003cli\u003e1 x Transparent potentiometer access insulation cover\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003ch3\u003eGrounding Rules\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eTerminate the incoming cable shield drain wire exclusively at the receiver instrument rack clean earth ground bar.\u003c\/li\u003e\n\u003cli\u003eEnsure the 35 mm DIN-rail section is grounded properly to the enclosure sub-panel, while maintaining isolation between the transmitter circuit common and structural metal elements.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWiring Constraints\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eVerify the total external loop resistance of the 2-wire path stays within the specified voltage drop calculation boundaries under maximum 23 mA current limiting conditions.\u003c\/li\u003e\n\u003cli\u003eRoute all sensor-to-transmitter extension leads through dedicated low-capacitance conduits to maintain high signal accuracy.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eShielding Requirements\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eEnclose field cabling inside continuous steel conduit tracks to prevent high-frequency electromagnetic field induction from surrounding heavy equipment.\u003c\/li\u003e\n\u003cli\u003eMaintain a physical isolation routing path separation of at least 300 mm from three-phase alternating current motor feed lines.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eOperational Verification Rules\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eUtilize a variable DC voltage supply at the Test Input pin to verify the 4-20 mA transmitter loop span configuration without mechanically displacing the shaft.\u003c\/li\u003e\n\u003cli\u003eFasten the terminal landing screws to standard engineering torque guidelines to eliminate high contact resistance anomalies.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eEnvironmental Limitations\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eMount the hardware within an environmental protective housing if ambient industrial variables risk crossing the certified continuous temperature envelope.\u003c\/li\u003e\n\u003cli\u003eEnsure the outer transmitter plastic enclosure block is protected from mechanical impacts and high-velocity water sprays during plant washdown procedures.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eQ: What is the hot-swap behavior when replacing the 991 transmitter module during active machine protection phases?\u003c\/p\u003e\n\u003cp\u003eA: The associated control system input loop must be placed in manual bypass mode before disconnecting field terminal lines to avoid generating false high-thrust trip alarms.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eQ: Does the 991-25-50-01-05 device impose an internal current load on the monitoring rack backplane supply rails?\u003c\/p\u003e\n\u003cp\u003eA: No, this is an autonomous, loop-powered module drawing its total physical operational current directly from the external 24 VDC control loop instrumentation loop.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eQ: What redundancy switching delay is caused by the transmitter during a dual-channel controller failover state?\u003c\/p\u003e\n\u003cp\u003eA: The hardware outputs an uninterrupted, direct analog 4-20 mA current trend, which contributes 0 ms of electrical switching delay to external logic voting circuits.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eQ: Are firmware compatibility upgrades required when landing this transmitter model into newly deployed DCS networks?\u003c\/p\u003e\n\u003cp\u003eA: No, the module processes sensor variables using hardwired analog circuits, ensuring complete functional transparency across all digital firmware platforms and software versions.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eQ: What physical signal isolation is provided between the front BNC diagnostic plug and the main 4-20 mA circuit loop?\u003c\/p\u003e\n\u003cp\u003eA: The PROX OUT interface shares a common return ground path with the transmitter circuit; connected diagnostic devices must use floating or isolated grounds to prevent loop errors.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eQ: What field wiring constraints must be observed when adjusting the zero and span calibration parameters?\u003c\/p\u003e\n\u003cp\u003eA: Technicians must use insulated adjustment tools to avoid touching interior circuitry, and the outer label must be re-sealed immediately to block moisture ingress.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eQ: How does the internal Power-up Inhibit circuit protect the monitoring system during startup transitions?\u003c\/p\u003e\n\u003cp\u003eA: The circuit clamps the loop output at a safe baseline value during power application, blocking line voltage switching transients from triggering false protection trips.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eQ: Can this specific thrust transmitter keep its accurate scaling matrix if the shaft material changes from AISI 4140 steel?\u003c\/p\u003e\n\u003cp\u003eA: No, the eddy-current probe scaling framework is factory-tuned to AISI 4140 steel specs; target shafts composed of other alloys will cause non-linear measuring tracking deviations.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Bently Nevada","offers":[{"title":"Default Title","offer_id":46025983787181,"sku":"991-25-50-01-05","price":88.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0733\/1613\/9181\/files\/990_5e352bbf-8428-4ae7-9301-ab79f87e9325.jpg?v=1783784143","url":"https:\/\/www.maxwellplc.com\/products\/991-25-50-01-05-bently-nevada-990-991-series-thrust-transmitter","provider":"Maxwell PLC Ltd","version":"1.0","type":"link"}