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- 3300 XL 25mm Proximity Probe
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Technical Engineering Report
330851-02-00-08-50-01-CN Proximity Probe System
1. Product Overview
The model 330851-02-00-08-50-01-CN is an 8 mm eddy current proximity probe assembly designed for accurate monitoring of shaft vibration, axial displacement, and rotor position in rotating machinery.
It is a non-contact measurement system that detects changes in distance between the probe tip and a conductive shaft surface, converting mechanical motion into a proportional electrical signal for condition monitoring and protection systems.
The “08” in this model indicates an 8-meter cable configuration, while the “CN” suffix refers to a regional or configuration-specific variant within the same product architecture.
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 measurement system
- System structure: Probe + Extension cable + Driver
This product family is widely used in rotating machinery condition monitoring and is known for long-term operational stability and high measurement reliability.
3. Product Introduction
This probe system is designed for permanent installation on industrial rotating equipment such as turbines, compressors, pumps, and generators.
It forms part of a complete vibration monitoring chain, where the probe measures shaft movement, the cable transmits the signal, and the driver converts it into usable output for monitoring systems.
It is engineered for harsh industrial environments including high temperature, vibration, oil exposure, and electromagnetic interference conditions.
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: 8 m
- Cable type: Shielded high-temperature coaxial cable
- Connector type: Miniature industrial coaxial connector
- Installation type: Threaded probe mounting
- Environmental resistance: Oil, heat, vibration resistant
4.3 Dimensions and Weight
| Item | Specification |
|---|---|
| Probe diameter | 8 mm |
| Probe length | ~100 mm |
| Cable length | 8 m |
| Total system length | ~8.2–8.8 m |
| Probe weight | 0.12 kg |
| Cable weight | 0.36 kg |
| System reference weight | 0.85 kg |
| Total assembled system weight | 0.48 kg |
5. Product Function Description
The system operates using eddy current 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 gap distance between probe and shaft.
This enables continuous monitoring of key machine parameters such as:
- Shaft radial vibration
- Axial displacement (thrust position)
- Rotor stability condition
- Long-term mechanical condition trends
6. Application Areas
This model is widely used in critical industrial rotating machinery applications:
- Steam turbine generator systems
- Gas turbine units
- Centrifugal compressors
- Industrial pump systems
- Refinery and petrochemical equipment
- Marine propulsion shafts
- Heavy-duty gearboxes
- Power generation auxiliary systems
It is commonly integrated into predictive maintenance and machinery protection systems.
7. Product Advantages
- High precision micro-displacement measurement capability
- Stable long-term signal output performance
- Strong resistance to electromagnetic interference
- Suitable for harsh industrial environments
- Modular design for flexible installation
- Reliable continuous 24/7 operation capability
- High linearity across full measurement range
- Proven industrial durability in critical 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 components
- Designed for permanent installation on rotating machinery
- Widely used in industrial condition monitoring systems
9. Recommended Models (Same Series or Closely Related)
Same Series Variants
| Model | Description | Key Parameters | Dimensions | Weight (kg) |
|---|---|---|---|---|
| 330851-02-00-05-50-01-CN | Short cable version | 8 mm probe, 5 m cable, compact installation | 8 mm × 95 mm | 0.24 |
| 330851-02-00-06-50-01-CN | Medium cable version | 8 mm probe, 6 m cable, compressor use | 8 mm × 98 mm | 0.26 |
| 330851-02-00-08-50-01-CN | Current model | 8 mm probe, 8 m cable, industrial monitoring | 8 mm × 100 mm | 0.48 |
| 330851-02-00-09-50-01-CN | Extended cable version | 8 mm probe, 9 m cable, turbine application | 8 mm × 102 mm | 0.52 |
| 330851-02-00-10-50-01-CN | Long cable version | 8 mm probe, 10 m cable, heavy machinery | 8 mm × 105 mm | 0.58 |
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 | Enhanced thermal resistance design | 8 mm × 102 mm | 0.21 |
| 330180-50-00 | Signal conditioning module | Converts probe signal to monitoring output | 120 × 80 × 40 mm | 0.45 |
| 330100-90-00 | Driver module | Signal amplification and conditioning unit | 150 × 100 × 50 mm | 0.82 |
| 3500/42M | Monitoring module | Multi-channel machinery protection system | 220 × 130 × 60 mm | 1.25 |
11. Engineering Summary
The 330851-02-00-08-50-01-CN proximity probe system is designed for medium-length installation scenarios where an 8-meter cable provides balanced flexibility between installation layout and signal stability.
It delivers accurate, stable, and continuous monitoring of shaft vibration and displacement, making it suitable for long-term industrial condition monitoring applications.
The system is widely used in predictive maintenance strategies to identify early-stage mechanical issues such as imbalance, misalignment, bearing wear, and rotor instability, helping reduce unplanned downtime and improve equipment reliability.