Introduction
The component with part number 990-05-XX-01-CN is a proximity transducer system, commonly known as a probe and extension cable assembly, manufactured by Bently Nevada* (a Baker Hughes company). The "XX" in the part number is a variable placeholder that specifies the precise cable length of the assembly.
This system is a fundamental component for machinery condition monitoring and protection. It is designed to directly measure the relative vibration and position of a rotating shaft by generating a DC voltage proportional to the distance between the probe tip and the shaft, and an AC voltage that represents the dynamic motion (vibration). It is a critical input for monitoring systems like the 3500 series.
Parameters
The following table outlines the key technical parameters for a typical 990-05-XX-01-CN assembly. The dimensions and weight are approximate and can vary slightly with the cable length.
| Parameter | Specification |
|---|---|
| Part Number | 990-05-XX-01-CN (e.g., 990-05-02-01-CN for a 2-meter cable) |
| System Type | Proximity Transducer System (5 mm) |
| Components | Includes a 5 mm Proximitor® Driver (e.g., 330105-00-00-00-00-CN), a 5 mm Probe (e.g., 330180-50-00), and an armored Extension Cable. |
| Total Cable Length | Varies (e.g., 5m, 7m, 9m). The "XX" denotes the length in feet or a code for it. |
| Probe Diameter | 5 mm (0.197 inches) |
| System Scale Factor | Typically 200 mV/mil (7.87 V/mm) |
| Operating Temperature | Probe: -34°C to 177°C (-29°F to 350°F) Cable: -34°C to 177°C (-29°F to 350°F) |
| Power Requirement | Typically -24 VDC or -18 to -26 VDC from the monitoring system. |
| Output Signal | The gap-to-voltage signal containing both DC (position) and AC (vibration) components. |
| Dimensions & Weight (Approx.) | Probe & Cable Assembly: Diameter ~5mm, length varies. Driver: ~80mm x 40mm x 25mm. Total Weight (for a 5m system): ~1.0 - 1.5 kg (2.2 - 3.3 lb) |
Application Scenarios
The 990-05-XX-01-CN proximity transducer system is a workhorse for measuring key parameters on rotating machinery. Its primary application scenarios include:
Radial Vibration Monitoring:
Mounted perpendicular to the shaft at bearing housings to measure the dynamic motion (vibration) of the rotor. This is essential for detecting conditions like unbalance, misalignment, and oil whirl.
Axial (Thrust) Position Monitoring:
Mounted parallel to the shaft axis to monitor the position of the thrust collar. This prevents catastrophic damage by ensuring the rotor remains within its designed axial clearance.
Differential Expansion Monitoring:
Used to measure the difference in thermal growth between the rotor and the stator (casing) during startup and shutdown of large turbines.
Eccentricity (Slow-Roll) Monitoring:
Measures shaft bow or bend when the machine is at low speeds or on turning gear, helping to prevent high vibration during startup.
Keyphasor® Reference Signal:
Used to provide a once-per-revolution timing mark for measuring phase angle, which is critical for machine balancing and diagnosing specific faults.
Typical Machinery Monitored:
Steam Turbines & Gas Turbines
Centrifugal & Axial Compressors
Large Pumps & Motors
Generators
Gearboxes
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