{"product_id":"991-06-70-02-00-bently-nevada-transmitter-991-thrust-module","title":"991-06-70-02-00 Bently Nevada Transmitter 991 Thrust Module","description":"\u003ch3\u003e\u003cstrong\u003eEngineering Overview\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003e\u003cspan style=\"color: #0056b3;\"\u003eBently Nevada\u003c\/span\u003e \u003cspan style=\"color: #d9534f;\"\u003e991-06-70-02-00\u003c\/span\u003e\u003c\/strong\u003e functions as a loop-powered axial position signal conditioning module belonging to the high-reliability \u003cstrong\u003e\u003cspan style=\"color: #d9534f;\"\u003e991 Series\u003c\/span\u003e\u003c\/strong\u003e thrust transmitter platform. Designed to process proximity sensor telemetry without requiring an external Proximitor driver, this 2-wire unit converts mechanical shaft displacement directly into a calibrated 4 to 20 mA DC current loop signal for direct PLC, DCS, or SCADA integration.\u003c\/p\u003e\n\u003cp\u003eCapable of mounting on standard 35mm DIN rails or cabinet bulkheads, the \u003cstrong\u003e\u003cspan style=\"color: #d9534f;\"\u003e991-06-70-02-00\u003c\/span\u003e\u003c\/strong\u003e operates with a dedicated 3300 NSv proximity probe and extension cable across a total 7.0-meter system length. Built-in non-interacting zero\/span adjustments and high-speed \"Not OK\" fault defeat logic protect plant machinery against false trips and unmonitored axial rotor movement.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003ePart Number Configuration Breakdown\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBase Part Number: \u003cspan style=\"color: #d9534f;\"\u003e991\u003c\/span\u003e\u003c\/strong\u003e\n\u003cul\u003e\n\u003cli\u003eDesignation: 991 Thrust \/ Axial Position Vibration Transmitter Module.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFull-scale Option: -06\u003c\/strong\u003e\n\u003cul\u003e\n\u003cli\u003eDesignation: 0.6-0-0.6 mm (suitable for 25-0-25 mils linear axial measurement range).\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSystem Length Option: -70\u003c\/strong\u003e\n\u003cul\u003e\n\u003cli\u003eDesignation: 7.0 meters (23.0 feet) total electrical system length (probe plus extension cable).\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting Option: -02\u003c\/strong\u003e\n\u003cul\u003e\n\u003cli\u003eDesignation: Bulkhead screw mounting hardware (with standard DIN rail adapter provision).\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAgency Approval Option: -00\u003c\/strong\u003e\n\u003cul\u003e\n\u003cli\u003eDesignation: Standard uncertified hardware version (Agency approvals not required).\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eTechnical Specifications\u003c\/strong\u003e\u003c\/h3\u003e\n\u003ctable border=\"1\" cellpadding=\"6\" cellspacing=\"0\" style=\"width: 100%; border-collapse: collapse;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eManufacturer Brand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e\u003cspan style=\"color: #0056b3;\"\u003eBently Nevada\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFull Part Model\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e\u003cspan style=\"color: #d9534f;\"\u003e991-06-70-02-00\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eProduct Series\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e\u003cspan style=\"color: #d9534f;\"\u003e991 Series \/ 991 Transmitter\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eModule Function\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e2-Wire Axial Position \/ Thrust Vibration Transmitter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSensor Input Interface\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eAccepts 1 non-contacting 3300 NSv proximity probe and extension cable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFull Scale Measurement Range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0.6-0-0.6 mm (Linear proximity range: 0.25 to 1.65 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSystem Electrical Length\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e7.0 meters (23.0 feet) total loop length\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAnalog Output Signal\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e4 to 20 mA DC 2-wire current loop (Sourced loop supply)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOperating Power Supply\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e+12 to +35 VDC continuous input at module terminals\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eLoop Signal Accuracy\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eWithin ±1.5% of specified full-scale range (typical)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaximum Loop Resistance\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1,000 Ω (including line wiring resistance at 35 VDC)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOutput Current Limit\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e23 mA typical current cap under fault overload\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNot OK \/ Signal Defeat Logic\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eOutput drops below 3.6 mA within 100 µs on fault (restores in 0.1 s)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOperating Temperature Window\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e-35°C to +85°C (-31°F to +185°F) field transmitter limit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePhysical Mass\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0.43 kg (0.9 lbs) net weight\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003e\u003cstrong\u003eTarget Equipment and Industrial Application Scenarios\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003e\u003cspan style=\"color: #d9534f;\"\u003e991-06-70-02-00\u003c\/span\u003e\u003c\/strong\u003e transmitter provides continuous axial protection across critical plant rotating assets:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSteam turbine high-pressure axial rotor position monitoring.\u003c\/li\u003e\n\u003cli\u003eMultistage boiler feed pump thrust bearing wear detection.\u003c\/li\u003e\n\u003cli\u003eHigh-speed centrifugal gas compressor rotor displacement loops.\u003c\/li\u003e\n\u003cli\u003eIndustrial fan and blower axial shaft shift monitoring in balance-of-plant automation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eAdvanced Fault Diagnostics and Protection Capabilities\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003e\u003cspan style=\"color: #d9534f;\"\u003e991 Series\u003c\/span\u003e\u003c\/strong\u003e module includes specialized diagnostics to protect control loops:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eInstantaneous \"Not OK\" fault response drops signal to under 3.6 mA within 100 microseconds during probe cable open\/short conditions.\u003c\/li\u003e\n\u003cli\u003eBuffered raw proximity output test terminal for connecting portable vibration analyzers during active operation.\u003c\/li\u003e\n\u003cli\u003eNon-interacting zero and span adjustment pots simplify zero-point shaft alignment in field enclosures.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eGlobal PLC Spare HUB's Insight\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eDuring a balance-of-plant upgrade on a power plant cooling tower pump, engineers experienced nuisance trips due to noisy analog input cards on their legacy DCS. The site lacked dedicated rack monitors and needed direct 4-20 mA telemetry into the PLC. By installing the \u003cstrong\u003e\u003cspan style=\"color: #0056b3;\"\u003eBently Nevada\u003c\/span\u003e \u003cspan style=\"color: #d9534f;\"\u003e991-06-70-02-00\u003c\/span\u003e\u003c\/strong\u003e paired with a 7-meter 3300 NSv probe system, we delivered a clean 4-20 mA axial signal straight to the control system. Its fast 100 µs Not-OK circuit instantly flagged a loose terminal screw during commissioning before it could trigger an unnecessary automated plant trip.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eGlobal Shipping and Warranty Terms\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eWe supply factory-grade machinery protection components under reliable commercial terms:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e12-Month Coverage:\u003c\/strong\u003e Backed by a comprehensive \u003cstrong\u003e12-month factory warranty\u003c\/strong\u003e effective from receipt date.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e24-48 Hour Dispatch:\u003c\/strong\u003e In-stock hardware undergoes physical inspection and ships within \u003cstrong\u003e24 to 48 hours\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExpress Couriers:\u003c\/strong\u003e Fast international air shipment available via premium carriers: \u003cstrong\u003eFedEx\u003c\/strong\u003e, \u003cstrong\u003eUPS\u003c\/strong\u003e, and \u003cstrong\u003eDHL\u003c\/strong\u003e.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eSelection and Commissioning Procurement Guide\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eVerify these critical system factors before finalizing purchase of the \u003cstrong\u003e\u003cspan style=\"color: #d9534f;\"\u003e991-06-70-02-00\u003c\/span\u003e\u003c\/strong\u003e:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eProbe System Pairing:\u003c\/strong\u003e Ensure your field probe and extension cable total exactly 7.0 meters and belong to the 3300 NSv series; pairing with 5m or 9m systems causes severe scale inaccuracy.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeasurement Direction:\u003c\/strong\u003e Confirm that your thrust span matches the 0.6-0-0.6 mm option (centered zero position) for bi-directional axial rotor float detection.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTerminal Powering:\u003c\/strong\u003e Verify your loop power supply delivers at least +12 to +35 VDC across the terminal block, factoring in total loop resistance up to 1,000 Ω.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQuestion 1: What is the main advantage of using a 991 series transmitter over a traditional Proximitor sensor?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe 991 transmitter outputs a direct 4-20 mA loop current proportional to axial position, allowing direct wiring into PLC or DCS analog inputs without needing a specialized machinery monitoring rack system.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQuestion 2: How does the \"Not OK\" feature on the \u003cspan style=\"color: #d9534f;\"\u003e991-06-70-02-00\u003c\/span\u003e interact with a connected PLC system?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eIf the proximity probe cable breaks or detaches, the transmitter forces its output below 3.6 mA in under 100 microseconds. The PLC detects this low current as a transducer fault rather than a false high-thrust shutdown.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQuestion 3: Can I connect a standard 3300 XL 8mm probe to the \u003cspan style=\"color: #d9534f;\"\u003e991-06-70-02-00\u003c\/span\u003e transmitter module?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. This specific transmitter configuration is factory-calibrated exclusively for 3300 NSv proximity probes and matching 7.0-meter total system length cables.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQuestion 4: Do the zero and span adjustments on the front panel affect each other during calibration?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. The 991 series features non-interacting zero and span potentiometer controls, allowing independent zeroing without shifting the full-scale span setting.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQuestion 5: What causes the 4-20 mA signal on a thrust transmitter to lock at maximum scale (over 20 mA)?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThis typically occurs when the mechanical gap between the probe tip and target collar exceeds the maximum linear range (1.65 mm) or when the probe cable suffers from severe grounding noise or loose terminal connections.\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":45013972025526,"sku":"991-06-70-02-00","price":168.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0722\/7863\/8774\/files\/991_5_248b2417-9ab7-4dde-b43b-03bb73e53d0f.jpg?v=1785835526","url":"https:\/\/www.plcsparehub.com\/products\/991-06-70-02-00-bently-nevada-transmitter-991-thrust-module","provider":"Global PLC Spare Hub","version":"1.0","type":"link"}