Overview
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 330195-02-12-10-CN |
| Base Model | 330195 |
| Brand | Bently Nevada |
| Product Type | 3300 XL 8 mm Extended Temperature Range (ETR) Reverse Mount Proximity Probe |
| Dimensions | 3/8-24 UNF thread; 0.2 in unthreaded length; 1.2 in case length |
| Operating Temp | Extended Temperature Range; exact limits not specified in supplied data |
| Power Consumption | No local power consumption; probe operates with a compatible Proximitor sensor |
| Probe Tip Material | Polyphenylene sulfide (PPS) |
| Probe Case Material | AISI 303 / 304 stainless steel |
| Mounting Configuration | Reverse mount |
| Thread Type | 3/8-24 UNF |
| Linear Range | 2.0 mm (80 mils) |
| Typical Measurement Span | 0.25 mm to 2.3 mm (10 to 90 mils) from target surface |
| Incremental Scale Factor | Approximately 7.87 V/mm (200 mV/mil) with standard 3300 XL Proximitor sensor |
| Integrated Cable Length | 1.0 m (3.3 ft) |
| Connector | Miniature coaxial connector |
| System Compatibility | 3300 XL 8 mm Proximitor sensors and compatible extension cables |
| Application Measurements | Shaft vibration, axial position, and Keyphasor reference/speed |
Eddy-Current Scaling and Gap Voltage Validation
The 330195 probe forms part of the 3300 XL eddy-current measurement chain. The Proximitor sensor converts the probe’s impedance variation into an electrical output proportional to the target-to-tip gap.
For field verification, technicians should establish the specified probe gap and confirm the corresponding Proximitor output before commissioning. A negative DC gap voltage, commonly referenced around -10 VDC at the nominal setup point for Bently Nevada systems, provides a practical installation reference. The exact acceptance value must follow the applicable system manual and calibration procedure.
The stated scale factor is approximately 7.87 V/mm (200 mV/mil). Therefore, probe installation geometry directly affects the available measurement range and signal margin.
Frequently Asked Questions
Q: Does the probe require individual electrical matching with the Proximitor sensor?
A: No. The supplied specifications identify the 3300 XL components as electrically and mechanically interchangeable without individual component matching.
Q: What measurement range does the 330195 probe provide?
A: The specified linear range is 2.0 mm (80 mils), with a typical measurement span from 0.25 mm to 2.3 mm (10 to 90 mils).
Q: Can the probe connect directly to a control system input?
A: No. The probe operates as part of the 3300 XL transducer chain and requires a compatible Proximitor sensor for signal conditioning.
Field Installation Guidelines
- Install the probe using the specified 3/8-24 UNF mounting arrangement and maintain the required mechanical clearance.
- Set the probe-to-target gap according to the applicable 3300 XL installation procedure.
- Verify the Proximitor DC gap voltage before placing the machinery protection channel into service.
- Route probe cables separately from high-voltage power conductors, switching circuits, and sources of electromagnetic interference.
- Maintain the cable’s minimum bend radius and prevent mechanical loading at the miniature coaxial connector.
- Use appropriate cable shielding and grounding practices for the complete transducer circuit. Avoid creating unintended ground loops.
- Inspect the probe tip and target surface for contamination, mechanical damage, or excessive runout before commissioning.
- Confirm the complete probe, extension cable, and Proximitor configuration before final signal validation.
- Verify vibration and position readings against the expected rotor dynamics and machinery operating condition.
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