Description
Key Technical Specifications
- Model Number: 330192-10-80-90-05
- Manufacturer: Bently Nevada (a Baker Hughes business)
- Probe Type: Keyphasor (eddy current) phase reference probe
- Probe Diameter: 8mm (0.315″) – standard for industrial keyphasor applications
- Case Length: 80mm (3.15″) – extended for deep mounting in turbine/compressor shafts
- Unthreaded Length: 0mm (00 option) – flush-mount capability
- Cable Configuration: 90ft (27.43m) integral cable; PFA insulation, 100% stainless steel braided shield, 22 AWG stranded copper conductors
- Connector Type: MIL-C-5015 male (mates with 3300 XL Proximitors)
- Operating Temperature: -54°C to +121°C (-65°F to +250°F)
- Impedance: 50Ω (matched to 3300 XL Proximitor impedance)
- Sensitivity: 200 mV/mm (5.08 mV/mil) typical (ferrous target, 25°C)
- Pulse Output: Square-wave pulse (triggered by shaft keyway/notch)
- Certifications: CE, ATEX Zone 0 (Ex ia IIC T6), IECEx ia IIC T6, API 670 compliant
- Compatibility: Bently 3300 XL Proximitors, 3500 Machinery Protection System, System 1 Condition Monitoring Software
- Bend Radius: 15mm (static), 25mm (dynamic)
- Weight: 2.1kg (4.63lbs) (including 90ft cable)
Bently 330101-00-18-05-02-05
Field Application & Problem Solved
In critical rotating machinery vibration analysis—refinery steam turbines, power plant gas turbines, chemical plant centrifugal compressors—the biggest keyphasor challenge is reliable phase reference data over long cable runs without signal degradation or phase shift. Generic keyphasor probes fail here: their cables lack impedance matching (causing 10-15° phase drift over 50ft+), use fragile PVC insulation (failing in lube oil/chemical environments), or have thin shielding (picking up VFD/motor noise that corrupts pulse signals). A Texas refinery lost $310k in a 7-hour outage when a generic keyphasor cable’s phase shift led to incorrect vibration analysis—technicians misdiagnosed rotor unbalance as misalignment, delaying repairs until bearing damage occurred. A Pennsylvania power plant spent $42k annually replacing generic cables that produced erratic pulses, making predictive maintenance impossible.
This probe solves these issues with its factory-engineered long-reach design. You’ll find it in: deep turbine shaft ends, compressor trains with remote proximitor mounting, pump skids where the keyway is 90ft+ from the monitoring system. It’s the standard for retrofits or new builds where machinery design requires the keyphasor probe to be placed far from the proximitor, such as large turbine casings or offshore platform compressors.
Its core value is keyphasor precision + long-reach signal integrity + harsh-environment durability. Unlike generics, it maintains phase accuracy (±1° max drift over 90ft) thanks to 50Ω impedance matching, resists oil/chemicals with PFA insulation, and blocks EMI/RFI with 100% braided shielding. For a Louisiana chemical plant, this probe enabled accurate phase reference for a 90ft-distant compressor keyway—avoiding $75k in machinery modification costs and enabling reliable unbalance detection 48 hours before a potential failure.
Installation & Maintenance Pitfalls (Expert Tips)
- Gap Setting: Mid-Range 2mm Critical for Pulse Consistency: Rookies set the keyphasor gap too close (saturating the signal) or too far (weak pulses), leading to missing triggers. An Ohio steel mill’s turbine vibration analysis failed until the gap was adjusted to 2mm (midpoint of the 4mm linear range). Use a precision feeler gauge—never rely on visual alignment.
- Connector Torque: 0.8Nm (7.1 in-lbs) – No Exceptions: Over-torquing MIL connectors strips threads; under-torquing causes intermittent pulse dropouts. A Florida refinery’s keyphasor failed after 3 months when the connector was torqued to 1.3Nm—invest in a torque wrench with a MIL adapter to hit the exact spec.
- Shield Grounding: Single-Point at Proximitor End Only: Grounding the shield at both probe and proximitor creates a ground loop, introducing noise that distorts pulse shape. A North Carolina refinery’s pulse signals were jagged until we disconnected the shield from the turbine housing and grounded it solely at the proximitor. Never splice or break shield continuity.
- Daisy-Chaining or Splicing Is a Failure Point: Rookies splice shorter cables to reach 90ft, causing phase shift and signal loss. A Michigan paper mill’s keyphasor showed 20° phase drift until we replaced the spliced setup with this integral 90ft model—splicing voids calibration and invalidates API 670 compliance.
- Routing: 30cm Clearance from Power Cables: Running the 90ft cable parallel to 480V+ power lines induces noise that corrupts pulse timing. A Texas refinery’s keyphasor pulses were delayed until the cable was rerouted through a separate conduit, 30cm away from motor power cables. Use 90° crossings if power lines can’t be avoided.
Bently 330101-00-18-05-02-05
Technical Deep Dive & Overview
The Bently 330192-10-80-90-05 is a purpose-built keyphasor probe designed to provide precise phase reference data for rotating machinery vibration analysis. At its core, a precision-wound 8mm coil generates an electromagnetic field; when a shaft keyway or notch passes the probe tip, the change in target distance alters the coil’s impedance. The 3300 XL Proximitor converts this impedance change into a sharp square-wave pulse, which serves as a “time zero” reference for correlating vibration data to specific points on the rotor’s rotation.
What sets this probe apart is its long-reach signal integrity. The 90ft cable’s 50Ω impedance is matched to Bently proximitors, eliminating phase shift and pulse distortion that plague generic long-reach cables. The PFA insulation resists turbine lube oil, chemical vapors, and temperature extremes (-54°C to +121°C), while the 100% stainless steel braided shield blocks EMI/RFI from VFDs, motors, and power cables—critical for maintaining pulse consistency.
Unlike generic keyphasor probes, it’s API 670 compliant, ensuring it meets strict standards for phase accuracy and reliability in machinery protection systems. The 80mm case length fits in deep shaft bores, and the MIL-C-5015 connector provides a vibration-resistant connection that won’t loosen during operation. For maintenance and reliability teams, this probe isn’t just a sensor—it’s the foundation of predictive maintenance: the keyphasor pulse enables analysis of 1X (synchronous) vibration, identifying unbalance, misalignment, or resonance that would otherwise go undetected. Its rugged design and Bently-native integration make it the gold standard for long-reach keyphasor applications in harsh industrial environments.
