{"product_id":"990-08-70-03-01-bently-nevada-990-vibration-transmitter","title":"990-08-70-03-01 Bently Nevada 990 Vibration Transmitter","description":"\u003ch3\u003e\u003cstrong\u003eOverview\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003e990-08-70-03-01\u003c\/strong\u003e is an advanced 2-wire vibration transmitter manufactured by \u003cstrong\u003eBently Nevada\u003c\/strong\u003e within the \u003cstrong\u003e990 Vibration Transmitter\u003c\/strong\u003e series. Designed to interface directly with a 3300 NSv proximity probe and extension cable, this compact unit converts raw displacement signals into a proportional 4 to 20 mA DC output loop. It provides an economical, rackless solution for continuous shaft vibration monitoring in balance-of-plant machinery, featuring non-interacting zero\/span adjustments and built-in \"NOT OK\" signal defeat diagnostics.\u003c\/p\u003e\n\u003ch3\u003ePart Number \u0026amp; Configuration Breakdown (990-AA-BB-CC-DD)\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBase Model (990):\u003c\/strong\u003e 990 Vibration Transmitter Platform\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOption A (-08):\u003c\/strong\u003e Full-scale Option — 0 to 8 mils pp (0 to 200 μm pp) vibration range\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOption B (-70):\u003c\/strong\u003e System Length Option — 7.0 meters (23.0 feet) total matched electrical length\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOption C (-03):\u003c\/strong\u003e Mounting Option — DIN clips and screws for secure panel or rail mounting\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOption D (-01):\u003c\/strong\u003e Agency Approval Option — CSA Division 2 hazardous area classification\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e \u003cstrong\u003eBently Nevada\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries:\u003c\/strong\u003e \u003cstrong\u003e990 Vibration Transmitter\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCondition:\u003c\/strong\u003e New \u0026amp; Original in Factory Packing\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTechnical Specifications Matrix\u003c\/h3\u003e\n\u003ch4\u003e1. Input, Power \u0026amp; Loop Parameters\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eInput Signal:\u003c\/strong\u003e Accepts 1 non-contacting 3300 NSv Proximity Probe and matching extension cable\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperating Power:\u003c\/strong\u003e Requires +12 to +35 V DC input at transmitter terminals\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSignal Output:\u003c\/strong\u003e 4 to 20 mAdc over specified full-scale range in 2-wire configuration\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLoop Accuracy:\u003c\/strong\u003e Within ± 1.5% over specified full-scale range (measured across a 250 Ω loop resistance)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Loop Resistance:\u003c\/strong\u003e 1,000 Ω including cable at 35 V DC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCurrent Limiting:\u003c\/strong\u003e 23 mA typical clamp protection\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003e2. Metrology \u0026amp; Operating Parameters\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eProbe Gap Window:\u003c\/strong\u003e Probe must be gapped between 0.5 and 1.75 mm (20 and 55 mils) from the target to guarantee full-scale linear output\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFrequency Response:\u003c\/strong\u003e 5 Hz to 6,000 Hz (+0, -3 dB)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMinimum Target Diameter:\u003c\/strong\u003e 9.5 mm (0.375 in)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTransmitter Net Weight:\u003c\/strong\u003e 0.43 kg (0.9 lbm)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003e3. Diagnostic \u0026amp; Safety Features\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eNOT OK Signal Defeat:\u003c\/strong\u003e Output drops to \u0026lt; 3.6 mA within 100 μs upon detecting a sensor fault; normal signal restores within 2 to 3 seconds after fault clearance\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eZero and Span:\u003c\/strong\u003e Non-interacting external potentiometers for precise calibration\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHazardous Ratings:\u003c\/strong\u003e CSA Division 2 \/ Zone 2 certification with power supply limit of 28 V\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eModel Comparison \u0026amp; Technical Selection Guide\u003c\/h3\u003e\n\u003cp\u003eWhen scaling monitoring loops for balance-of-plant machinery, selecting the correct full-scale range and system length ensures optimal loop sensitivity. Compare with the alternative variant \u003ca href=\"https:\/\/www.plcsparehub.com\/products\/990-04-50-02-05-990-vibration-transmitter-bently-nevada-module\"\u003e\u003cstrong\u003e990-04-50-02-05\u003c\/strong\u003e\u003c\/a\u003e, which features a tighter 0 to 4 mils pp (0 to 100 μm pp) full-scale range (-04), a shorter 5.0 meter system length (-50), panel mount adapter configuration (-02), and ATEX\/IECEx Zone 0\/1 hazardous approvals (-05). \u003cstrong\u003eTechnical Recommendation:\u003c\/strong\u003e If your machinery exhibits higher baseline vibration amplitudes up to 8 mils pp and requires standard rail-mounted DIN hardware with CSA Div 2 compliance, stick with the \u003cstrong\u003e990-08-70-03-01\u003c\/strong\u003e. If tighter vibration resolution is required in a European hazardous zone environment, evaluate the alternative model link above.\u003c\/p\u003e\n\u003ch3\u003eInstallation \u0026amp; Wiring Guidelines\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDIN Rail Mounting:\u003c\/strong\u003e Secure the transmitter using the factory-provided -03 DIN clips and screws inside a protected local junction box or instrument cabinet.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLoop Wiring:\u003c\/strong\u003e Connect the 2-wire 4 to 20 mA loop using shielded twisted-pair cable, ensuring total loop resistance stays below 1,000 Ω at 35 V DC.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBNC Access:\u003c\/strong\u003e Utilize the front BNC connector for temporary diagnostic data collection (up to 3 meters \/ 10 feet maximum cable distance for portable analyzers).\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eDiagnostic Capabilities \u0026amp; Fault Monitoring\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLoop Current Drop:\u003c\/strong\u003e An output current plunging below 3.6 mA instantly flags a broken probe cable, disconnected power terminal, or internal sensor failure via the NOT OK defeat circuit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProximity Gap Checks:\u003c\/strong\u003e Verify using a digital voltmeter that the probe DC gap voltage corresponds to the required 0.5 to 1.75 mm installation window before locking zero\/span adjustments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eGlobal PLC Spare HUB's Insight \u0026amp; Expert Guidance\u003c\/h3\u003e\n\u003cp\u003eGlobal PLC Spare HUB's Insight notes that unlike multi-slot rack systems (such as the 3500 series), the 990 transmitter relies on loop-powered integrity. When deploying the \u003cstrong\u003e990-08-70-03-01\u003c\/strong\u003e, ensure your DCS or PLC analog input card is configured with a 250 Ω input resistor to properly translate the 4 to 20 mA signal into accurate engineering units without grounding loops.\u003c\/p\u003e\n\u003ch3\u003eCompatible Equipment \u0026amp; Target Application Scenarios\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Equipment:\u003c\/strong\u003e Bently Nevada 3300 NSv proximity probes, 3300 NSv extension cables, and plant distributed control systems (DCS) or PLCs with 4-20 mA analog input cards.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTarget Application Scenarios:\u003c\/strong\u003e Small steam turbines, centrifugal air compressors, industrial pumps, motor-driven gearboxes, and auxiliary balance-of-plant skids where full rack protection is economically unviable.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eLogistics, Fulfillment \u0026amp; Warranty Protection\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eShipping Carriers:\u003c\/strong\u003e Express global dispatch via \u003cstrong\u003eFedEx\u003c\/strong\u003e, \u003cstrong\u003eUPS\u003c\/strong\u003e, and \u003cstrong\u003eDHL\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFulfillment Speed:\u003c\/strong\u003e Guaranteed processing and dispatch within 24 to 48 hours.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty Terms:\u003c\/strong\u003e Fully backed by a 12-month factory replacement or repair warranty.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eProfessional Frequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eWhat causes the 990-08-70-03-01 transmitter output to drop below 3.6 mA?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eAn output current dropping below 3.6 mA triggers the NOT OK signal defeat, indicating an open circuit, severed probe cable, or loss of operating power at the transmitter terminals.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I adjust the zero and span settings without affecting each other?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes, the transmitter is engineered with non-interacting external potentiometers, allowing technicians to calibrate span without shifting the zero baseline setting.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhy is maintaining the 0.5 to 1.75 mm probe gap critical for this model?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eOperating within this specific gap window ensures the Proximitor front-end remains in its linear region, allowing the transmitter to accurately scale displacement into the 4-20 mA loop.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat are the best selection guidelines when replacing an existing vibration transmitter?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eAlways match the exact full-scale range option (e.g., -08 for 8 mils) and system electrical length (-70 for 7 meters) to preserve the factory-calibrated scale factor of your vibration loop.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow should I troubleshoot a sluggish 4-20 mA response during machinery startup?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eCheck for excessive loop resistance exceeding 1,000 Ω, verify that plant power supply voltage is maintained between 12 and 35 V DC, and inspect signal cable shielding for ground loops.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0722\/7863\/8774\/files\/990_Graphs_and_Figures_8ba4a14f-832f-4772-a484-c09fd48b12f9.png?v=1784875470\" alt=\"\"\u003e\u003c\/p\u003e","brand":"Bently Nevada","offers":[{"title":"Default Title","offer_id":45013934309558,"sku":"990-08-70-03-01","price":203.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0722\/7863\/8774\/files\/BentlyNevada990_1_5c092660-4983-4b0d-b354-ad4e0f8e5dbd.jpg?v=1787039908","url":"https:\/\/www.plcsparehub.com\/products\/990-08-70-03-01-bently-nevada-990-vibration-transmitter","provider":"Global PLC Spare Hub","version":"1.0","type":"link"}