990-08-xx-03-00 Bently Nevada 2-Wire Velocity Transducer
Manufacturer: Bently Nevada
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Part Number: 990-08-xx-03-00
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 990-08-xx-03-00 functions as a high-performance, 2-wire velocity vibration transmitter designed for absolute casing vibration measurement. This sensor integrates the transducer and signal conditioning electronics into a single stainless-steel housing. It converts mechanical casing motion into a proportional electrical signal compatible with Bently Nevada 3300 and 3500 Machinery Protection Systems. By mounting directly to the machine housing, it provides critical data for detecting structural imbalances, bearing wear, and misalignment. We deliver this unit as 100% Brand New and Original in factory packaging.
Part Number Breakdown: 990-08-xx-03-00
The 990-08 series uses a modular part numbering system to tailor the sensor to specific machinery requirements.
| Code | Option | Description |
| 08 | Transmitter Type | Velocity Transducer (Casing Measurement) |
| xx | Sensitivity | Defines output (e.g., 25, 50, or 100 mV/in/sec) |
| 03 | Mounting Thread | Standard 3/8-24 UNF Stud Mount |
| 00 | Agency Approval | Standard hazardous area certifications (ATEX/IECEx/CSA) |
Technical Specifications
| Parameter | Details |
| Measurement Type | Casing Vibration (Velocity) |
| Frequency Range | 10 Hz to 1,000 Hz (600 to 60,000 CPM) |
| Sensitivity | Dependent on "xx" option (e.g., 50 mV/in/sec) |
| Dynamic Range | ±50 g peak |
| Output Signal | Voltage proportional to velocity |
| Housing Material | 316L Stainless Steel |
| Operating Temp | -30°C to +100°C (-22°F to +212°F) |
| Connection | 2-wire system |
Engineering Advantages
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Direct Casing Integration: The 990-08 mounts directly to the bearing housing or machine casing. This allows the sensor to capture structural vibration data that proximity probes (measuring relative shaft motion) might miss, providing a complete machinery health profile.
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Simplified 2-Wire Loop: The 2-wire design reduces field wiring complexity. It utilizes the same wires for power and signal transmission, lowering installation costs and minimizing potential failure points in the wiring loop.
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Ruggedized for Extreme Environments: The 316L stainless steel housing resists corrosive chemicals and salt spray. With an operating temperature rating up to 100°C and hermetic sealing, this transmitter thrives in offshore platforms and steam turbine halls.
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Broad Frequency Coverage: The 10 Hz to 1,000 Hz range captures the fundamental frequencies of most industrial rotating equipment. This ensures early detection of common faults such as unbalance, vane pass frequencies, and mechanical looseness.
FAQs
Q: How do I select the correct "xx" sensitivity for my application?
A: The "xx" value determines the signal scale (e.g., 50 mV/in/sec). You must match this to the configuration of your 3500/42M or 3300/16 monitor module. Using the wrong sensitivity will result in incorrect vibration readings and potential false trips.
Q: Does the 990-08 require a separate Proximitor®?
A: No. Unlike proximity probes, the 990-08 is a self-contained transmitter. It does not require an external signal conditioner; it connects directly to the monitor I/O or a 24V DC power loop.
Q: Can this sensor be used in hazardous gas environments?
A: Yes. The 990-08-xx-03-00 carries multiple global certifications including ATEX, IECEx, and CSA. When installed with an approved intrinsic safety barrier, it is safe for use in Zone 0, 1, or 2 (Class I, Div 1 or 2).
Q: What is the benefit of the 3/8-24 UNF mounting thread?
A: This thread size provides a high-stiffness mechanical bond to the machine. Proper torquing of the 3/8-24 stud ensures the sensor accurately tracks high-frequency casing vibrations without introducing mounting resonance errors.