990-04-XX-01-CN Bently Nevada 2-Wire Vibration Transmitter
Manufacturer: Bently Nevada
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Part Number: 990-04-XX-01-00
Condition：New with Original Package
Product Type: Vibration Transmitters
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Country of Origin: USA
Payment:T/T, Western Union
Shipping port: Xiamen
Warranty: 12 months
Product Overview
The Bently Nevada 990-04-XX-01-CN (including MOD 165335-01) functions as a high-performance, loop-powered 2-wire vibration transmitter. Unlike standard proximity sensors that measure relative shaft motion, the 990-04 mounts directly to the machine casing to measure absolute structural vibration. It integrates a velocity transducer and signal conditioning electronics into a single stainless-steel housing, providing a direct 4-20 mA output proportional to vibration velocity. This design eliminates the need for external monitors or interface modules, allowing for direct integration into PLC, DCS, or SCADA systems. We supply this unit as 100% Brand New and Original in factory-sealed packaging.
Part Number Breakdown: 990-04-AA-BB-CC
The 990 series uses a modular part number system to define mounting threads and agency approvals.
| Code | Option | Description |
| 04 | Vibration Type | Velocity measurement (output in in/s or mm/s) |
| XX (AA) | Mounting Option | Defines Stud size (e.g., M8x1, 1/4-28, or 3/8-24 threads) |
| 01 (BB) | Agency Approval | Multiple approvals including CSA, ATEX, and IECEx |
| CN (CC) | Region/Specific | Specific regional certification or MOD requirement |
Technical Specifications
| Parameter | Details |
| Output Signal | 4-20 mA DC (Proportional to Velocity) |
| Frequency Response | 10 Hz to 1,000 Hz (600 to 60,000 CPM) |
| Sensitivity | 50 mV/in/sec nominal (internal conversion to mA) |
| Dynamic Range | ±50 g peak |
| Supply Voltage | 12 to 30 Vdc (Loop Powered) |
| Housing Material | 316L Stainless Steel |
| Operating Temp | -30°C to +100°C (-22°F to +212°F) |
| Enclosure Rating | IP66 / NEMA 4X |
Engineering Advantages
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Direct PLC Integration: The 990-04 outputs a standard 4-20 mA signal. This allows you to connect the sensor directly to an analog input card on a DCS or PLC without purchasing expensive rack-based monitoring hardware.
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Simplified 2-Wire Installation: Because the unit is loop-powered, it requires only two wires for both power and signal transmission. This significantly reduces wiring costs and complexity in large-scale plant deployments.
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Superior Environmental Sealing: The 316L stainless steel housing resists corrosive atmospheres, making it ideal for offshore platforms, cooling towers, and chemical processing facilities. The hermetically sealed design prevents moisture ingress even in 95% non-condensing humidity.
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RFI/EMI Shielding: Advanced internal filtering blocks electromagnetic interference from large motors and variable frequency drives (VFDs). This ensures your control system receives a clean, accurate vibration trend without "ghost" alarms.
FAQs
Q: What is the difference between the 990-04 and a standard accelerometer?
A: A standard accelerometer outputs a raw voltage signal requiring external conditioning. The 990-04 is a "transmitter," meaning it contains internal electronics that process the vibration data and output a 4-20 mA signal ready for a control system.
Q: Does the 990-04-XX-01-CN require a specific mounting orientation?
A: You can mount the 990-04 in any orientation (vertical, horizontal, or inclined). However, ensure the axis of the sensor aligns with the direction of the vibration you intend to measure for maximum accuracy.
Q: Can this sensor be used in explosive atmospheres?
A: Yes. The "01" and "CN" designations typically indicate hazardous area certifications. This module carries ATEX and IECEx approvals, making it suitable for Zone 0, 1, or 2 when used with a proper intrinsic safety barrier.
Q: What does the "MOD 165335-01" signify?
A: MOD numbers indicate specific factory modifications. These usually involve customized cable lengths, specific connector types, or calibrated sensitivity ranges tailored for a particular OEM's requirements. Our units maintain full compatibility with these specific MOD standards.