Bently Nevada 990-04-50-01-00 Vibration Signal Transmitter – 3300 Series Proximity System
When a rotating machine runs without reliable vibration monitoring, the first sign of a bearing failure or shaft misalignment is often a catastrophic unplanned shutdown — not a warning alarm. In high-stakes environments such as gas turbine trains, centrifugal compressors, and steam turbine generators, the cost of a single undetected fault can exceed the value of an entire year’s maintenance budget. The Bently Nevada 990-04-50-01-00 Vibration Transmitter exists precisely to close that gap: converting raw proximity probe signals into a clean, loop-powered 4–20 mA output that feeds directly into your DCS, PLC, or safety instrumented system without ambiguity.
Within the Bently Nevada 3300 Series proximity system architecture, the 990-04-50-01-00 occupies the signal-conditioning tier — the critical link between the eddy-current probe and the plant control layer. The 3300 Series has been the de facto standard for turbomachinery protection in the oil & gas, power generation, and petrochemical industries for decades, and this transmitter variant is specifically configured for a 5-metre (50-foot) extension cable system with a standard output range, making it the most widely deployed configuration in the product family.
Technical Specifications
Electrical
- Output Signal: 4–20 mA, 2-wire loop-powered
- Supply Voltage: 18–30 VDC
- Maximum Loop Resistance: 600 Ω at 24 VDC
- Compatible Probe System: Bently Nevada 3300 XL 8 mm proximity probe
- Extension Cable Length: 5 m (part suffix -50)
- Measurement Range: 0–2 mm (0–80 mil) radial vibration gap
- Output Ripple: ≤ 10 mV p-p
Mechanical
- Enclosure: Aluminium alloy, IP66/NEMA 4X rated
- Conduit Entry: M20 × 1.5 or ½” NPT (specify on order)
- Mounting: DIN rail or panel mount
- Weight: 440 g
- Connector: 2-pin MIL-C-5015 series
Environmental
- Operating Temperature: −40 °C to +85 °C
- Storage Temperature: −55 °C to +105 °C
- Relative Humidity: 0–95% non-condensing
- Vibration Resistance: 20 g, 10–2000 Hz (IEC 60068-2-6)
Certifications & Standards
- ATEX / IECEx: Ex ia IIC T4 Ga (intrinsically safe, Zone 0)
- FM Approved: Class I, Division 1, Groups A–D
- CE Marked per EMC Directive 2014/30/EU
- Compliant with API 670 (5th Edition) — Machinery Protection Systems
Key Features & Benefits
- API 670-Compliant Signal Conditioning — Meets the mandatory instrumentation standard for turbomachinery protection in oil & gas facilities, satisfying EPC contractor and end-user specifications without additional engineering justification.
- Loop-Powered 4–20 mA Output — Eliminates the need for a separate transmitter power supply; a single twisted-pair cable carries both power and signal, reducing installation wiring cost by up to 40% compared to voltage-output alternatives.
- Wide Supply Voltage Tolerance (18–30 VDC) — Accommodates real-world panel voltage fluctuations without recalibration, critical in remote field installations where supply regulation is imperfect.
- IP66 / NEMA 4X Enclosure — Rated for direct water jet exposure and corrosive atmospheres, enabling installation in outdoor compressor stations and offshore platform decks without additional weatherproofing.
- Intrinsic Safety Certification (ATEX Zone 0 / FM Div. 1) — Approved for the most hazardous classified areas, allowing a single transmitter model to be deployed across Zone 0, 1, and 2 locations without redesigning the safety barrier circuit.
- Drop-in Compatibility with 3300 XL Probe Systems — Designed to interface directly with existing Bently Nevada 3300 XL 8 mm probe and extension cable assemblies; no signal re-ranging or DCS input card reconfiguration required when replacing legacy 990-series units.
Industry & Equipment Applications
- Oil & Gas — Upstream: Wellhead gas compressors, reciprocating injection pumps; monitors shaft radial displacement to detect imbalance before seal failure.
- Oil & Gas — Midstream & LNG: Pipeline booster compressor trains, LNG liquefaction expanders; provides continuous 4–20 mA feed to ESD systems for automatic trip logic.
- Power Generation: Steam turbine generators (50/60 Hz), gas turbine auxiliaries; integrates with Bently Nevada 3500 rack or third-party protection systems via standard analogue input cards.
- Petrochemical & Refining: Cracked gas compressors, reactor circulation pumps; withstands H₂S-laden atmospheres within IP66 enclosure, meeting API 670 siting requirements.
- Pulp & Paper / Heavy Industry: Large induced-draft fans, kiln drive gearboxes; provides early-warning vibration trending data to CMMS platforms via DCS historian.
- Marine & Offshore: FPSO main propulsion auxiliaries, offshore gas lift compressors; ATEX Zone 1 certification satisfies classification society requirements without additional barrier hardware.
System Integration & Compatible Parts
Upstream (Probe System):
- Bently Nevada 330180-X0-05 — 3300 XL 8 mm proximity probe (standard)
- Bently Nevada 330130-045-00-CN — 3300 XL extension cable, 5 m
- Bently Nevada 330105-02-12-10-02-00 — Proximitor sensor (driver)
Downstream (Protection / Control):
- Bently Nevada 3500/40M — Proximitor / Seismic Monitor rack card (direct 4–20 mA input)
- Bently Nevada 3500/22M — Transient Data Interface for waveform capture
- Any DCS analogue input card accepting 4–20 mA / HART (e.g., Emerson DELTAV AI card, Honeywell C300 AI module)
Equivalent / Replacement Models:
- Bently Nevada 990-04-70-01-00 — 7 m cable variant; direct functional equivalent, requires extension cable change only
- Bently Nevada 990-04-50-02-CN — China-market variant with identical electrical specification; confirm firmware revision before substitution in SIS-rated loops
- Note: Third-party proximity transmitters claiming 990-series compatibility must be validated against API 670 Table 1 output accuracy requirements (±1% full scale) before use in protection-rated loops.
Our Quality Assurance Process
- Incoming Inspection: Every unit is verified against the original manufacturer’s label, date code, and serial number. Counterfeit screening includes UV marking verification and housing dimensional check against OEM drawings.
- Functional Bench Test: Output linearity is tested across the full 4–20 mA range using a calibrated decade resistance box and precision DC supply; results are logged and retained for 3 years.
- Insulation & Loop Integrity Test: Hi-pot test at 500 VDC between signal loop and enclosure ground; loop resistance measured and compared against datasheet specification.
- Final Documentation Pack: Each shipment can be accompanied by — Test report, Certificate of Conformance (CoC), Material Traceability Record (MTR), Original manufacturer datasheet, and DHL/FedEx tracking with export documentation.
How to Order
- Submit Your Enquiry: Email support@konmask.com or use the enquiry form on this page. Include your required quantity, delivery port, and any certification requirements (ATEX, FM, etc.).
- Receive Quotation: Our technical team will confirm stock availability, lead time, and CIF/FOB pricing within 24 hours on business days.
- Confirm & Ship: Upon PO or deposit confirmation, we arrange export documentation, packing inspection photos, and door-to-door logistics to your facility.
Why Choose Konmask.com?
- Specialist Inventory: We stock Bently Nevada 990-series transmitters and 3300/3500 system components as a core product line — not as an afterthought.
- Technical Pre-Sales Support: Our team can verify probe-cable-transmitter system compatibility and advise on API 670 compliance before you commit to a purchase order.
- Documented Traceability: Full material traceability and test documentation available for every unit — essential for EPC contractor and end-user QA audits.
- Global Export Experience: We ship to over 40 countries with experience in export compliance for industrial automation equipment, including dual-use screening.
- Responsive Communication: 24-hour quotation turnaround, with a dedicated account contact for repeat buyers and MRO procurement teams.
Frequently Asked Questions
Q: Can the Bently Nevada 990-04-50-01-00 replace an older 990-04-50-01-00-CN unit in an existing API 670 protection loop?
A: In most cases, yes — the electrical specification is identical. However, you should verify that the replacement unit carries the same ATEX/FM certification revision as required by your site’s hazardous area classification documentation. Contact us and we will confirm the exact certification markings before shipment.
Q: What is the maximum cable distance between the 990-04-50-01-00 transmitter and the DCS analogue input card?
A: The 4–20 mA loop supports cable runs up to approximately 1000 m at 24 VDC supply, assuming a maximum loop resistance of 600 Ω. For longer runs or installations with significant electrical noise, we recommend shielded twisted-pair cable (Belden 9501 or equivalent) with the shield grounded at the DCS end only.
Q: Does the Bently Nevada 990-04-50-01-00 vibration transmitter support HART communication for remote configuration?
A: The standard 990-04-50-01-00 outputs a conventional 4–20 mA analogue signal without HART protocol. If your DCS asset management system requires HART for loop diagnostics, please enquire about alternative Bently Nevada transmitter configurations that support HART superimposed on the 4–20 mA loop.
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