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990 Vibration TransmitterBently Nevada* Asset Condition MonitoringDescriptionThe 990 Vibration Transmitter is intended primarily for the original equipmentmanufacturers (OEMs) of centrifugal air compressors or small pumps, motors, orfans who prefer to provide a simple 4 to 20 mA proportional vibration signal asthe input to their machinery control system. The transmitter is a 2-wire, looppowered device that accepts input from our 3300 NSv* proximity probe and itsmatching extension cable (available in 5 m and 7 m system length options). Thetransmitter conditions the signal into appropriate peak-to-peak vibrationamplitude engineering units, and provides this value as a proportional 4 to 20mA industry-standard signal as the input to the control system where machineryprotection alarming and logic occurs1.The 990 transmitter provides the following notable features: Integrated Proximitor* Sensor requires no external unit Non-isolated “PROX OUT" and "COM" terminals plus a coaxial connector toprovide a dynamic vibration and gap voltage signal output for diagnostics 2. Non-interacting zero and span potentiometers under the Transmitter labelsupports loop adjustment. Test Input pin for quick verification of loop signal output, using a functiongenerator as the input. A Not OK/Signal Defeat circuit prevents high outputs or false alarms due to afaulty proximity probe or loose connection. Choice of DIN-rail clips or bulkhead mounting screws as standard optionssimplifies mounting. Potted construction for high humidity (up to 100% condensing)environments. Compatibility with 3300 NSv proximity probe allows transducer installationin small areas with minimal clearance, typical of centrifugal air compressors.Notes:1.Vibration transmitters have many limitations when compared to a continuous vibrationmonitoring system. They are a practical solution in some applications for measuring generalvibration levels and are a valuable tool for overall vibration trending. However, they providelimited capability for machinery diagnostics using the vibration signal and do not capturedynamic vibration signals (used for diagnostics) in the event of a vibration alarm. While theSpecifications and Ordering InformationPart Number 141612-01Rev. M (02/15)Page 1 of 14

transmitter is capable of peak vibration alarming and non-OKchecking, the 4-20 mA signal cannot be used to determine the phaseof vibration, and monitor functions such as gap alarms, phase alarms,Timed OK channel defeat, Danger Bypass, and Trip Multiply cannot beused. In addition, PLCs attached to the vibration transmitter can onlyprovide peak-to-peak trending data and are not suitable for plantwide diagnostic systems such as System 1 or Rule Paks.2.The 990 Vibration Transmitter's "Prox Out" coaxial connector providesa non-isolated dynamic transducer signal for machinery diagnostics.You can connect this signal directly to battery-powered or isolatedtest equipment to diagnose machinery problems. However, since the"PROX OUT" signal is not isolated from the 4 to 20 mA loop signal, aninterface is available (and strongly recommended) for signal isolation.The 990/991 Test Adapter conditions the 990 Transmitter's "PROXOUT" signal for use with ac-powered test equipment. It also invertsand isolates the 990's transducer signal, making it suitable forequipment such as oscilloscopes and analyzers, and preservingindustry-standard conventions for signal polarity. We stronglyrecommend the use of this test adapter for all applications tomaintain isolation between test equipment and the loop signal, andensure that the installation maintains machinery protection integrity.Maximum LoopResistance1,000 including cable at 35 Vdc.Current Limiting23 mA typical.Zero and SpanNon-interacting externaladjustments.NOT OK/SignalDefeatSignal output will go to less than 3.6mA within 100 µs after a Not OKcondition occurs. Signal output isrestored within 2-3 seconds after theNot OK condition is removed.SpecificationsUnless otherwise noted, the following specificationsapply at 22 C ( 72 F) using a 3300 NSv Probe andExtension Cable, and an AISI 4140 steel target.Power-up InhibitSignal output stays at less than 3.6mA (NOT O.K.) for 2 to 3 seconds afterpower is applied. The purpose is tosignal that the device is not yetready. Transients may be observedwhen device goes O.K.Note: These specifications also apply to 990 withmodifications 147202-01 and 165335-01.ElectricalInputAccepts 1 non-contacting 3300 NSvProximity Probe and extension cable.Proximitor SensorOutputCompatible with ungrounded,portable test equipment. When usinggrounded, ac-powered testequipment, use the 122115-01 TestAdapter for signal isolation.PowerRequires 12 to 35 Vdc input at thetransmitter terminal.Output Impedance4 to 20 mA SignalOutputProx Out has a 10 k outputimpedance calibrated for a 10 M load.4 to 20 mAdc over specified full-scalerange in 2-wire configuration.Prox Out LinearRange4 to 20 mA LoopAccuracyWithin 1.5% over specified full-scalerange. Accuracy is rated from theTEST signal input to the voltagemeasured across a 250 loopresistance.Probe GapProbe must be gapped between 0.5and 1.75 mm (20 and 55 mils) fromtarget to ensure full scale range.1.4 mm (55 mils). Begins atapproximately 0.25 mm (10 mils)from target surface.Prox OutIncremental ScaleFactor7.87 mV/µm (200 mV/mil) 6.5%typical including interchangeabilityerrors when measured in incrementsof 0.25 mm (10 mils) over the linearSpecifications and Ordering InformationPart Number 141612-01Rev. M (02/15)Page 2 of 14

range using a flat 30 mm (1.2 inch)target. Worst case 7.87 mV/µm 10%. Typical Noise Level: 50 mV/pp.Compliance and CertificationsEMCStandards:EN 61000-6-2 Immunity for IndustrialEnvironmentsEN 55011/CISPR 11 ISM EquipmentEN 61000-6-4 Emissions for tal scale factor remainswithin 10% of 7.87 mV/µm (200mV/mil) from 0 C to 70 C ( 32 F to 158 F).European Community Directives:EMC Directive 2004/108/ECFrequencyResponse5 Hz to 6,000 Hz 0, -3 dB.Electrical SafetyMinimum TargetSizeStandards:EN 61010-19.5 mm (0.375 in) diameter.European Community Directives:2006/95/EC Low VoltageLeadwire LengthMaximum for Proximitor* SensorOutput (BNC connector), maximumcable distance is 3 metres (10 feet).For further certification and approvals information please visit thefollowing website:www.ge-mcs.com/bentlyHazardous Area ApprovalsNon-Hazardous,Zone 2 or Div 2Hazardous arealocationsCSA/NRTL/C13 km (8 miles) maximum betweentransmitter and receiving device forsignal output.Class I, Div 2Groups A, B, C, DT5 @ Ta 85 C, Type 4Per Drawing 128838KTL/KCIntrinsically SafeHazardous arealocationsEx ia IIC T4 GaT4 @ -20 C Ta 100 CEx nA IIC T4 GcT4 @ -35 C Ta 85 C68 metres (225 ft.) maximumbetween transmitter and receivingdevice for signal output.ATEXElectricalClassification:II 1 GGeneral Purpose Approval byCanadian Standards Association(CSA/NRTL/C) in North America andby VDE in Europe. 990 has the CEmark for Europe.Ex ia IIC T4 GaT4 @ -35 C Ta 85 CII 3 GEx nA IIC T4 GcT4 @ -35 C Ta 85 CIECExEx ia IIC T4 GaT4 @ -35 C Ta 85 CSpecifications and Ordering InformationPart Number 141612-01Rev. M (02/15)Page 3 of 14

Ex nA IIC T4 GcT4 @ -35 C Ta 85 CCable Armor(optional)Flexible AISI 302 SST with optionalFEP outer jacket.Maritime ApprovalsAmerican Bureau of Shipping (ABS) nsile Strength222 N (50 lbf) probe case to probelead, maximum.TransmitterWeight:Environmental LimitsTransmitterTemperature0.43 kg (0.9 lbm).Total SystemWeight:OperatingTemperature0.82 kg (1.8 lbm) typical.-35 C to 85 C (-31 F to 185 F)Ordering Information990-AXX-BXX-CXX-DXXStorageTemperatureA: Full-scale Option-51 C to 100 C (-60 F to 212 F).Probe TemperatureOperatingTemperature-35 C to 177 C (-31 F to 350 F).StorageTemperature-51 C to 177 C (-60 F to 350 F).0405B: System Length Option5070C: Mounting Option010203D: Agency Approval Option0001050-4 mils pp (0-100 μm pp)0-5 mils pp (0-125 μm pp)5.0 metres (16.4 feet)7.0 metres (23.0 feet)35 mm DIN rail clipsBulkhead screwsDIN clips and screwsNot requiredCSA Division 2CSA Division 2, ATEX Zone 0, ATEXZone 2 and includes ABS maritimeapprovalRelative humidity100% condensing, non-submerged,with protection of coaxial connectors.Mechanical3300 NSv Proximity Probes330901Transducer TipMaterial3300 NSv Probe, 1/4-28 UNF thread,without armor.Polyphenylene sulfide (PPS).Transducer CaseMaterial3309023300 NSv Probe, 1/4-28 UNF thread,with armor.AISI 303 or 304 Stainless Steel (SST).Probe Cable33090875Ω coaxial, fluoroethylenepropylene (FEP) insulated.3300 NSv Probe, 3/8-24 UNF thread,without armor.Specifications and Ordering InformationPart Number 141612-01Rev. M (02/15)Page 4 of 14

3309093300 NSv Probe, 3/8-24 UNF thread,with armor.Part Number-AXX-BXX-CXX-DXX-EXXOption DescriptionsA: Unthreaded Length OptionNote: Unthreaded length must be at least 0.7in less than the case length.Order in increments of 0.1 inLength configurations:Minimum length: 0 inMaximum length: 9.2 inExample: 0 4 0.4 inB: Case Length OptionOrder in increments of 0.1 inThreaded length configurations:Minimum length: 0.8 inMaximum length: 9.9 inExample: 3 5 3.5 inC: Total Length Option051050700.5 metre (1.67 feet)1.0 metre (3.25 feet)5.0 metres (16.4 feet)7.0 metres (23 feet)Specifications and Ordering InformationPart Number 141612-01Rev. M (02/15)Page 5 of 14

D: Connector Option01021112Miniature coaxial ClickLoc*connector with connectorprotector, standard cableMiniature coaxial ClickLocconnector, standard cableMiniature coaxial ClickLocconnector with connectorprotector, FluidLoc* cableMiniature coaxial ClickLocconnector, FluidLoc cableE: Agency Approval Option00Not required05Multiple Approvals (CSA NRTL/Cand BASEEFA/CENELEC, whichincludes CSA Division 2)3300 NSv Probes, Metric3309033300 NSv Probe, M8 x 1 thread,without armor.3309043300 NSv Probe, M8 x 1 thread, witharmor.C: Total Length Option050.5 metre (1.67 feet)101.0 metre (3.25 feet)505.0 metres (16.4 feet)707.0 metres (23 feet)D: Connector Option0 1 Miniature coaxial ClickLoc connectorwith connector protector, standardcable0 2 Miniature coaxial ClickLoc connector,standard cable1 1 Miniature coaxial ClickLoc connectorwith connector protector, FluidLoccable1 2 Miniature coaxial ClickLoc connectorattached, FluidLoc cableE: Agency Approval Option00Not required05Multiple Approvals (CSA NRTL/Cand BASEEFA/CENELEC, whichincludes CSA Division 2)3300 NSv Reverse Mount Probe330906-02-12-CXX-DXX-EXX, 3/8-24 UNF threads330907-05-30-CXX-DXX-EXX, M10 x 1 UNF threadsOption Descriptions3309053300 NSv Probe, M10 x 1 thread,without armor.3309103300 NSv Probe, M10 x 1 thread,with armor.Part Number-AXX-BXX-CXX-DXX-EXXOption DescriptionsA: Unthreaded Length OptionNote: Unthreaded length must be at least 20mm less than the case length.Order in increments of 10 mmUntreaded length configurations:Minimum length: 0 mmMaximum length: 230 mmExample: 0 6 60 mmB: Case Length OptionOrder in increments of 10 mmMinimum length: 20 mmMaximum length: 250 mmExample: 2 5 250 mmC: Total Length Option050.5 metre (1.67 feet)101.0 metre (3.25 feet)505.0 metres (16.4 feet)707.0 metres (23 feet)D: Connector Option0 2 Miniature coaxial ClickLoc connector,standard cable12 Miniature coaxial ClickLoc connectorattached, FluidLoc cableE: Agency Approval Option00Not required05Multiple Approvals (CSA NRTL/Cand BASEEFA/CENELEC, whichincludes CSA Division 2)Specifications and Ordering InformationPart Number 141612-01Rev. M (02/15)Page 6 of 14