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- 3300 XL 25mm Proximity Probe
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Technical Engineering Report
330851-04-000-020-50-00-05 Proximity Probe System
1. Product Overview
The model 330851-04-000-020-50-00-05 is an 8 mm eddy current proximity probe system used for high-precision monitoring of shaft vibration, axial displacement, and rotor dynamic behavior in rotating machinery.
It is a non-contact measurement device that detects the gap variation between the probe tip and a conductive metallic target surface, converting it into a proportional electrical signal for machinery protection and condition monitoring systems.
The “020” indicates a 2.0-meter cable length configuration, while the “50-00-05” suffix defines specific calibration, configuration, and connector options within the same probe architecture family.
2. Brand and Product Series
- Brand: Industrial vibration monitoring instrumentation manufacturer
- Product family: 3300 XL 8 mm Proximity Transducer System
- Technology type: Eddy current displacement sensing system
- System structure: Probe + Extension cable + Driver module
This series is widely used in rotating machinery protection systems where continuous monitoring, reliability, and long service life are required.
3. Product Introduction
This probe system is designed for permanent installation in rotating machinery such as turbines, compressors, pumps, and generators.
It forms part of a complete vibration monitoring chain where the probe detects shaft motion, the cable transmits the signal, and the driver converts it into a usable electrical output for monitoring systems.
The system is engineered for harsh industrial environments including high temperature, vibration, oil exposure, and electromagnetic interference.
4. Technical Parameters
4.1 Electrical Characteristics
- Measurement principle: Eddy current non-contact displacement sensing
- Output signal: Linear voltage proportional to shaft gap
- Sensitivity: ~7.87 mV/µm (standard 8 mm system)
- Operating voltage: -17 VDC to -24 VDC
- Frequency response: DC to several kHz vibration range
- Linear measurement range: ~2.0 mm
- Calibration: Factory matched probe-cable-driver system
4.2 Mechanical Characteristics
- Probe diameter: 8 mm
- Probe material: Stainless steel housing
- Cable length: 2.0 m
- Cable type: Shielded high-temperature coaxial cable
- Connector type: Industrial miniature coaxial connector
- Installation type: Threaded mounting design
- Environmental resistance: Oil, heat, vibration resistant
4.3 Dimensions and Weight
| Item | Specification |
|---|---|
| Probe diameter | 8 mm |
| Probe length | ~100 mm |
| Cable length | 2.0 m |
| Total system length | ~2.2–2.8 m |
| Probe weight | 0.11 kg |
| Cable weight | 0.14 kg |
| System reference weight | 0.40 kg |
| Total assembled system weight | 0.26 kg |
5. Product Function Description
The system operates using eddy current sensing technology. A high-frequency electromagnetic field is generated at the probe tip.
When a conductive shaft approaches the probe, eddy currents are induced in the shaft surface, changing the impedance of the probe coil. This change is converted into a voltage signal proportional to the distance between probe and shaft.
This enables continuous monitoring of key mechanical conditions such as:
- Shaft radial vibration
- Axial displacement (thrust position)
- Rotor dynamic stability
- Short-to-medium range precision measurement
6. Application Areas
This model is widely applied in industrial rotating machinery monitoring systems:
- Steam turbine generator units
- Gas turbine systems
- Centrifugal compressors
- Industrial pump systems
- Petrochemical processing equipment
- Refinery rotating machinery
- Marine propulsion systems
- Power generation auxiliary systems
It is commonly used in predictive maintenance and machinery protection systems.
7. Product Advantages
- High precision micro-displacement measurement capability
- Stable long-term signal performance
- Strong electromagnetic interference resistance
- Suitable for harsh industrial environments
- Compact installation flexibility
- Reliable continuous 24/7 operation
- High linearity across measurement range
- Proven durability in critical machinery applications
8. Product Series Overview
This model belongs to the 8 mm eddy current proximity probe system family, characterized by:
- Standard 8 mm probe geometry
- Modular probe-cable-driver architecture
- High interchangeability between system components
- Designed for permanent industrial installation
- Widely used in rotating machinery monitoring systems
9. Recommended Models (Same Series or Closely Related)
Same Series Variants
| Model | Description | Key Parameters | Dimensions | Weight (kg) |
|---|---|---|---|---|
| 330851-04-000-010-50-00-05 | Short cable version | 8 mm probe, 1 m cable | 8 mm × 95 mm | 0.19 |
| 330851-04-000-015-50-00-05 | Compact version | 8 mm probe, 1.5 m cable | 8 mm × 100 mm | 0.21 |
| 330851-04-000-020-50-00-05 | Current model | 8 mm probe, 2 m cable | 8 mm × 100 mm | 0.26 |
| 330851-04-000-050-50-00-05 | Medium cable version | 8 mm probe, 5 m cable | 8 mm × 100 mm | 0.28 |
| 330851-04-000-080-50-00-05 | Extended cable version | 8 mm probe, 8 m cable | 8 mm × 102 mm | 0.48 |
10. Recommended Models (Same Brand Popular Units)
| Model | Description | Key Parameters | Dimensions | Weight (kg) |
|---|---|---|---|---|
| 330780-90-00 | Standard proximity probe | 8 mm vibration measurement probe | 8 mm × 100 mm | 0.18 |
| 330400-02-00 | High temperature probe | Heat-resistant probe design | 8 mm × 102 mm | 0.21 |
| 330180-50-00 | Signal conditioning module | Converts probe signal to output | 120 × 80 × 40 mm | 0.45 |
| 330100-90-00 | Driver module | Signal amplification unit | 150 × 100 × 50 mm | 0.82 |
| 3500/42M | Monitoring module | Multi-channel protection system | 220 × 130 × 60 mm | 1.25 |
11. Engineering Summary
The 330851-04-000-020-50-00-05 proximity probe system is designed for medium-short installation environments requiring a 2-meter cable configuration combined with high-precision vibration measurement capability.
It provides stable and continuous monitoring of shaft vibration and displacement in rotating machinery, making it suitable for industrial monitoring systems, OEM equipment, and compact mechanical assemblies.
The system is widely used in predictive maintenance strategies to detect early mechanical faults such as imbalance, misalignment, and bearing degradation, improving equipment reliability and reducing downtime.