Introduction
The part number 330750-60-05 refers to a Proximity Probe Assembly, a critical sensor used in machinery protection and condition monitoring systems for rotating equipment. This part number typically specifies a complete assembly including the probe itself, with a specified cable length.
This device is a non-contact sensor based on the eddy current principle. It generates a high-frequency electromagnetic field from its tip. When this field interacts with a conductive target (like a steel shaft), it induces eddy currents. Changes in the distance (gap) between the probe tip and the target cause predictable changes in the field, which are converted into a DC voltage signal. This allows it to precisely measure relative vibration, axial position, and eccentricity of a shaft.
Key Parameters
The following table outlines the typical specifications for a proximity probe assembly matching this part number.
| Parameter Category | Specification |
|---|---|
| Part Number | 330750-60-05 |
| Type | Eddy Current Proximity Probe Assembly |
| System Use | Part of a Proximity Transducer System (requires a -XX proximitor) |
| Measurement | Relative Displacement (Vibration / Position) |
| Linear Range | 0 to 2.0 mm (0 to 80 mils) - *Standard for a -60 probe* |
| Sensitivity | 200 mV/mil (7.87 V/mm) - Typical, target-dependent |
| Target Material | 4140 Steel or AISI 1018/1020 Steel (material-specific calibration) |
| Required Power | Provided by a separate Proximitor (e.g., -24 V DC) |
| Output Signal | Raw RF signal to the proximitor |
| Probe Tip Material | PEEK (Polyether Ether Ketone) or High-Temperature Plastic |
| Probe Body Material | 316 Stainless Steel |
| Cable Material & Jacket | Stainless Steel Braid with FEP/Teflon® Jacket (High-Temp, Oil-Resistant) |
| Cable Length | 5 meters (as specified by the "-05" suffix) |
| Operating Temperature | Probe: -30 °C to +150 °C Cable: -30 °C to +150 °C |
| Probe Dimensions | Approx. 40 mm (1.57 in) length x 8 mm (0.31 in) diameter (standard 8mm probe) |
| Total Weight | Approx. 0.5 kg (1.1 lbs) (including 5m cable) |
Application Scenarios
Proximity probes are the primary sensors for monitoring radial and axial displacement in high-speed turbomachinery. Their key application scenarios include:
Radial Vibration Monitoring:
Turbines, Compressors, and Pumps: Installed in X and Y orientations perpendicular to the shaft to measure the shaft's dynamic motion within the bearing clearance. This is essential for detecting unbalance, misalignment, and oil whirl, and for triggering machine trips to prevent catastrophic damage.
Axial Position Thrust Monitoring:
Used to monitor the position of the thrust collar within its bearing to detect excessive thrust load, which can occur during startup, shutdown, or due to process upsets. This protects the machine from catastrophic thrust bearing failure.
Eccentricity (Slow-Roll) Measurement:
Measures the mechanical runout or bow of a shaft when it is rotating at slow speeds (below its first critical speed). This helps distinguish between actual dynamic vibration and mechanical runout.
Keyphasor® Reference for Diagnostics:
A single probe is used as a Keyphasor® to provide a once-per-turn timing pulse by observing a keyway or notch on the shaft. This signal is fundamental for measuring phase lag, which is critical for rotor balancing and determining the mode shape of vibration.
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