Overview
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 330704-000-050-10-02-CN |
| Base Model | 330704 |
| Brand | Bently Nevada |
| Manufacturer | Bently Nevada, Baker Hughes |
| Product Type | 3300 XL 11 mm Proximity Probe |
| Probe Type | Eddy-current proximity probe |
| Thread Configuration | Metric |
| Unthreaded Length | 0 mm |
| Case Length | 50 mm |
| Cable Length | 1.0 m (3.3 ft) |
| Connector | Miniature coaxial ClickLoc connector |
| Cable Type | Standard cable |
| Agency Approval | CN country-specific approval / regional certification option |
| Probe Tip Size | 11 mm |
| System Output | 3.94 V/mm (100 mV/mil), when used with the applicable Proximitor and extension cable |
| Measurement Method | Non-contact eddy-current measurement |
| Primary Measurements | Shaft vibration, shaft position, axial position |
| Typical Applications | Fluid-film bearing machines, steam turbine axial position, differential expansion, reciprocating compressor rod drop |
| Dimensions | 50 mm case length; other dimensions not specified |
Eddy-Current Scaling and Gap Voltage
The probe operates as part of an eddy-current displacement measurement chain consisting of the probe, extension cable, and Proximitor sensor. The associated system converts the physical gap between the probe tip and conductive shaft target into an electrical output.
For installation and calibration, the probe gap must remain within the specified operating region of the complete transducer system. A nominal -10 VDC gap-voltage target is commonly used during Bently Nevada proximity system setup, but the applicable system documentation should define the exact calibration procedure for the installed configuration.
The stated system sensitivity is 3.94 V/mm (100 mV/mil). Therefore, the probe should be evaluated together with its matched Proximitor and cable rather than as an independent voltage-output device.
Frequently Asked Questions
Q: What does the 050 suffix represent in this configuration?
A: The supplied configuration identifies 050 as a 50 mm overall case-length option.
Q: What connector does the 330704-000-050-10-02-CN use?
A: The configuration uses a miniature coaxial ClickLoc connector with standard cable.
Q: Does the probe generate the 3.94 V/mm output by itself?
A: No. The stated 3.94 V/mm (100 mV/mil) output applies to the complete proximity transducer system when the probe operates with the applicable Proximitor and extension cable.
Field Installation Guidelines
- Install the probe with the specified metric mounting arrangement and maintain the required mechanical clearance around the probe body.
- Verify the probe tip faces the conductive measurement target without physical contact during normal shaft movement.
- Route the coaxial cable separately from high-current power wiring and high-energy switching conductors where practical.
- Avoid sharp bends, excessive mechanical tension, and unnecessary cable movement near the connector.
- Maintain the cable shielding and grounding arrangement specified for the associated Bently Nevada proximity monitoring system.
- Before commissioning, verify the probe gap voltage with the matched Proximitor and confirm that the signal changes correctly with controlled target displacement.
- Check the complete probe, cable, and Proximitor combination for correct scaling before connecting the measurement channel to machinery protection or monitoring logic.
- For axial position and differential expansion measurements, verify the mechanical reference position before establishing alarm or trip limits.
- Do not substitute an unmatched extension cable or Proximitor without confirming compatibility with the complete transducer system.
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