Introduction
The part number 330780-91-05 refers to a High-Temperature Proximity Probe Assembly. This is a specialized non-contact displacement sensor designed for extreme operating environments in critical machinery protection systems.
This device is an eddy current sensor that generates a high-frequency electromagnetic field from its tip. Changes in the distance (gap) between the probe tip and a conductive target (such as a turbine shaft) cause measurable changes in this field. A separate signal conditioner (proximitor) converts these changes into a DC voltage proportional to the distance, enabling precise measurement of relative vibration, axial position, and eccentricity. The "-91" suffix typically indicates a specific high-temperature rating, and the "-05" denotes a 5-meter integrated cable length.
Key Parameters
The following table outlines the typical specifications for this high-temperature proximity probe.
| Parameter Category | Specification |
|---|---|
| Part Number | 330780-91-05 |
| Type | High-Temperature Eddy Current Proximity Probe |
| System Use | Part of a Proximity Transducer System (requires a matching proximitor) |
| Measurement | Relative Displacement (Vibration / Position) |
| Linear Range | 0 to 2.0 mm (0 to 80 mils) - Typical for standard range |
| Sensitivity | 200 mV/mil (7.87 V/mm) - Target-dependent |
| Target Material | 4140 Steel or AISI 1018/1020 Steel (material-specific calibration is critical) |
| Required Power | Provided by a separate Proximitor (e.g., -24 V DC) |
| Output Signal | Raw RF signal to the proximitor |
| Probe Tip Material | High-Temperature Ceramic |
| Probe Body Material | 316 Stainless Steel |
| Cable Material & Jacket | Stainless Steel Armor with High-Temperature FEP/Teflon® Jacket |
| Cable Length | 5 meters (as specified by the "-05" suffix) |
| Operating Temperature | Probe: -30 °C to +175 °C (-22 °F to +347 °F) or higher* |
| Dimensions (Probe Body) | Approx. 40 mm (1.57 in) length x 8 mm (0.31 in) diameter (standard 8mm probe) |
| Total Weight | Approx. 0.6 kg (1.32 lbs) (including 5m armored cable) |
*The "-91" suffix often signifies a specific high-temperature rating, which can extend up to 200°C for some versions.*
Application Scenarios
This high-temperature proximity probe is essential for monitoring critical turbomachinery where sensors are exposed to extreme heat from the process or the machine itself.
Gas & Steam Turbine Monitoring:
Radial Vibration: Installed on bearing housings close to the hot section of the turbine to monitor shaft vibration directly, providing essential data for protecting against unbalance, misalignment, and rotor instabilities.
Axial Position: Used to monitor the position of the turbine rotor to prevent catastrophic thrust bearing failure, a critical safety parameter.
Hot Section Monitoring in Compressors:
Centrifugal Compressors: In high-pressure and high-temperature compressor applications, especially in oil & gas and petrochemical industries, these probes monitor shaft vibration and position where ambient temperatures are exceptionally high.
High-Temperature Machinery Protection:
Large Pumps and Fans: Used in applications where the bearing housing or process environment generates significant heat, exceeding the capabilities of standard proximity probes.
Keyphasor® Reference in Hot Environments:
Provides a reliable once-per-turn timing pulse from a keyway or notch on a hot shaft. This signal is crucial for measuring phase and speed, which are fundamental for rotor balancing and diagnosing machine faults during operation.
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