Introduction
The part number 18745-01 refers to a Keyphasor® Proximity Probe manufactured by Bently Nevada (a Baker Hughes business). This is a fundamental sensor used in machinery condition monitoring and protection systems. The Keyphasor® probe provides two critical pieces of information:
A once-per-turn timing reference to measure the rotational speed and phase angle of a shaft.
Vibration timing reference to observe vibration vector data and determine the motion of the shaft relative to the probe.
It is an essential component for conducting dynamic motion analysis, balancing, and startup/shutdown monitoring of rotating equipment.
Technical Parameters
The following table outlines the key technical specifications for a typical Bently Nevada 18745-01 Keyphasor® Probe.
| Parameter Category | Specification |
|---|---|
| Part Number | 18745-01 |
| Product Line | Bently Nevada |
| Description | Keyphasor® Proximity Probe System (Includes Probe and Extension Cable) |
| System Components | Proximity Probe, 5-meter (16.4 ft) or 9-meter (29.5 ft) Extension Cable |
| Probe Tip Diameter | 5 mm (0.197 in) / 8 mm (0.315 in) - model specific |
| Probe Length | Approximately 50 mm to 100 mm (body) (2 in to 4 in) |
| Operating Temperature | Probe: -34°C to 177°C (-29°F to 350°F) Cable: -34°C to 177°C (-29°F to 350°F) |
| Cable Length & Type | Integral to the part number; typically 5m or 9m, double-shielded with armor |
| Electrical Compatibility | Requires a -XX mm gap (target dependent) and mates with a Bently Nevada proximitor (e.g., 3300, 3500 series). |
| Dimensions & Weight (Probe Only) | Diameter: ~ 12 mm (0.47 in) Length: ~ 75 mm (3 in) (typical threaded body) Weight: ~ 0.1 kg (0.22 lbs) |
| Dimensions & Weight (Complete Kit) | Shipping Weight: Approximately 0.5 - 1.0 kg (1.1 - 2.2 lbs) depending on cable length. |
*Note: The exact dimensions and specifications can vary. The 18745-01 is often a kit that includes both the probe and a specific length of pre-connected cable. Always consult the manufacturer's datasheet for the precise variant.*
Application Scenarios
The 18745-01 Keyphasor® probe is indispensable in any industry that relies on critical rotating machinery.
Steam and Gas Turbines:
Provides the essential speed and phase reference for monitoring rotor dynamics during startup, shutdown, and continuous operation. It is crucial for identifying slow-roll runout and determining true vibration vectors.
Centrifugal Compressors:
Used to measure rotational speed and phase, enabling accurate balancing and troubleshooting of subsynchronous vibrations like oil whirl.
Pumps and Motors:
Monitors shaft speed and provides a phase reference for in-situ balancing, helping to correct imbalance issues that lead to premature bearing failure.
Generators and Large Gearboxes:
Serves as the primary timing marker for torsional vibration analysis and for observing the phase relationship between different shafts in a drivetrain.
In summary, the 18745-01 Keyphasor® Probe is a critical sensor for understanding the dynamic behavior of rotating shafts, forming the foundation for advanced machinery diagnostics and protection strategies.
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