Overview
Configured for non-contact displacement measurement in the 3300 XL 8 mm Proximity Transducer System, the Bently Nevada 330103-20-25-05-02-CN (330103 Proximity Probe) converts the physical gap between its sensing tip and a conductive shaft target into an electrical displacement signal. The probe uses eddy-current measurement for radial vibration, axial position, and rotational reference applications.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 330103-20-25-05-02-CN |
| Base Model | 330103 |
| Brand | Bently Nevada (Baker Hughes) |
| Series | 3300 XL 8 mm Proximity Transducer System |
| Product Type | 3300 XL 8 mm Proximity Probe |
| Measurement Principle | Eddy-current displacement measurement |
| Probe Diameter | 8 mm |
| Linear Range | 2.0 mm (80 mils) |
| Linear Operating Range | Approximately 0.25 mm to 2.3 mm (10 to 90 mils) |
| Scale Factor | Nominal 7.87 V/mm (200 mV/mil) with a standard 3300 XL Proximitor Sensor and AISI 4140 steel target |
| Linearity | Within 1% over the specified linear range |
| Thread Configuration | M10 x 1 metric thread |
| Probe Tip Material | Polyphenylene sulfide (PPS) |
| Probe Case Material | AISI 303 / 304 stainless steel |
| Cable Type | 75 ohm coaxial cable with FEP insulation |
| Connector | Gold-plated miniature coaxial ClickLoc connector |
| Operating Temp | -51 deg C to +177 deg C (-60 deg F to +351 deg F) |
Eddy-Current Probe Scaling and Gap Validation
The 330103-20-25-05-02-CN uses the eddy-current principle to establish a relationship between probe-to-target gap and output voltage. When paired with the specified 3300 XL Proximitor Sensor and AISI 4140 target, the nominal scale factor is 7.87 V/mm.
For installation verification, technicians can check the transducer gap voltage against the system’s specified electrical reference. A -10 VDC target is a commonly used Bently Nevada reference point for checking probe gap and system response. The actual acceptance value must follow the applicable system documentation and calibration procedure.
The probe tip and stainless steel case use a TipLoc structural bond. In addition, the CableLoc design provides mechanical retention between the probe case and lead, with the supplied data specifying up to 330 N (75 lbf) pull strength.
Frequently Asked Questions
Q: What measurement principle does the 330103-20-25-05-02-CN use?
A: It uses eddy-current sensing to measure the physical gap between the probe tip and a conductive target.
Q: What scale factor applies to this probe?
A: The nominal scale factor is 7.87 V/mm (200 mV/mil) when used with a standard 3300 XL Proximitor Sensor and an AISI 4140 steel target.
Q: Does the probe require a separate power supply?
A: The supplied data does not specify independent probe power consumption. The probe functions as part of the 3300 XL Proximity Transducer System.
Field Installation Guidelines
- Install the probe with the specified M10 x 1 metric thread and maintain the required mechanical clearance from the rotating target.
- Position the probe so that the sensing axis remains directed toward the intended conductive target surface.
- Verify probe gap and output voltage during commissioning using the applicable 3300 XL system procedure.
- Route the coaxial cable separately from high-current power conductors and strong electromagnetic interference sources where practical.
- Avoid excessive bending, pulling, or mechanical loading of the probe cable and connector.
- Keep the ClickLoc connector clean and fully engaged before system operation.
- Connect cable shielding and grounding according to the 3300 XL installation documentation and the plant grounding scheme.
- Verify the probe, extension cable, and Proximitor Sensor combination before replacing individual components, because transducer electrical characteristics depend on the complete measurement chain.
- Confirm the actual target material and installation geometry before applying the stated scale factor, since eddy-current response depends on target characteristics.
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