Threaded case
Overall case length
Total probe length
Agency option 00
Quick Buyer Answer
Choose this exact model when the installed requirement is: 3300 XL 25 mm probe, M30x2 thread, 0 mm unthreaded length, 80 mm overall case length, 1 m total length, no armor and no agency approvals.
Do not order by the 330851 family number alone. A different suffix may change the mounting thread, case length, electrical length, armor or approval status and may require other system components to change.
Product Information
Bently Nevada 330851-02-000-080-10-00-00 is a configured 3300 XL 25 mm proximity probe. It is one component of the 3300 XL 25 mm Proximity Transducer System, which consists of a 25 mm probe, a matching extension cable and a 3300 XL 25 mm Proximitor Sensor.
The manufacturer identifies the system for differential expansion (DE) measurement on mid-size to large steam-turbine generators. It measures the relative growth between the turbine rotor and the machine stator or casing. Depending on the machine arrangement, two transducers may observe the same side of a collar, opposite sides of a collar, or separate ramp locations.
Exact Order-Code Breakdown
| Code | Manufacturer option | Selected configuration |
|---|---|---|
| 330851 | Product family | 3300 XL 25 mm proximity probe |
| 02 | Probe case type | M30x2 thread |
| 000 | Unthreaded length | 0 mm |
| 080 | Overall case length | 80 mm |
| 10 | Total length | 1.0 metre (3.3 ft) |
| 00 | Armor option | No armor |
| 00 | Agency approval | No approvals |
Manufacturer Figure 12: 330851 threaded-case probe geometry and cable construction.
Manufacturer Technical Data
Important: Electrical performance figures apply to a complete and correctly matched 3300 XL 25 mm transducer system. They must not be treated as probe-only performance.
| System linear range | 12.7 mm (500 mils), approximately 0.63 to 13.33 mm from target |
|---|---|
| Average scale factor | 0.787 V/mm (20 mV/mil) nominal |
| Frequency response | 0 to 2.7 kHz, +0/-3 dB typical, with up to 305 m of field wiring |
| Recommended minimum target | 61 mm (2.4 in) diameter flat target; manufacturer base specifications use AISI 4140 steel |
| Probe tip material | PEEK |
| Probe case material | AISI 304 stainless steel |
| Probe cable | 75 ohm triaxial, PFA-insulated FluidLoc cable |
| Probe operating/storage temperature | -35°C to +200°C (-31°F to +392°F) |
| Short-term temperature | +250°C (482°F) maximum for less than 24 hours |
| Minimum bend radius | 25.4 mm (1.0 in) |
| Rated tensile strength | 330 N probe case-to-lead; 270 N at probe-lead to extension-cable connectors |
Manufacturer Figure 10: typical system magnitude response versus field-wiring length.
Is This Exact Configuration Right for Your Machine?
| Buyer check | Good fit when | Stop and recheck when |
|---|---|---|
| Mounting | The machine accepts an M30x2 threaded probe and an 80 mm case. | The installed probe uses an English thread, smooth case, side exit or another case length. |
| Electrical length | A 1 m probe lead is combined with the correct extension cable for the selected 5 m or 9 m Proximitor Sensor. | The probe and extension-cable lengths do not add up to the Proximitor Sensor system length. |
| Environment | The temperature, connector protection and cable routing comply with the manufacturer limits. | Armor, hazardous-area approval or a different mounting arrangement is required. |
| Measurement | The application is 25 mm system differential-expansion measurement with a suitable target and gap range. | The requirement is general radial vibration, speed, Keyphasor or another probe family. |
What procurement and maintenance teams usually care about
A label photo prevents confusion between visually similar probes with different mechanical or approval options.
The probe, extension cable and Proximitor Sensor must belong to the 3300 XL 25 mm system and have the correct total electrical length.
A same-suffix spare may be a component replacement; a legacy-system upgrade can require all three transducer-system components.
State whether manufacturer datasheets, certificates, label photos or inspection records are needed with the quotation.
Applications and Engineering Requirements
Primary application
Differential expansion measurement on mid-size to large steam-turbine generators as part of Turbine Supervisory Instrumentation (TSI).
Target and gap
Confirm target material, minimum target size, probe orientation, initial gap and the full expected rotor-to-casing movement.
System matching
The probe length plus extension-cable length must equal the 5 m or 9 m total length of the selected 3300 XL 25 mm Proximitor Sensor.
Installation review
Verify M30x2 mounting, 80 mm case clearance, cable bend radius, connector protection and the requirement for agency approvals before ordering.
Discontinuation and Replacement Status
No official discontinuation date identified
The current manufacturer Datasheet 163236 Rev. M still lists the 330851 configurable probe family and includes option 00 = No Approvals. No official manufacturer notice found for this review states that 330851-02-000-080-10-00-00 has been discontinued, and no responsible discontinuation date can therefore be given. The final -00 is an agency-approval selection, not an obsolescence code.
| Alternative or upgrade path | Replacement level | Engineering action required |
|---|---|---|
| 330851-02-000-080-10-00-05 | Closest same-configuration alternative; the manufacturer lists it among commonly stocked multiple-approval probes. | All mechanical and length codes match; only the agency option changes from 00 to 05. Confirm required markings, certificate acceptance and current availability. Do not treat approval documentation as interchangeable without review. |
| Other 330851 case or length options | Not an automatic complete replacement. | Recheck mounting thread, case length, unthreaded length, total electrical length, armor, clearances and DE measurement geometry. |
| Upgrade from a legacy 7200 or 25 mm DE integral system | System-level upgrade, not a probe-only replacement. | The manufacturer states that the output is identical so monitor configuration changes are not required, but the probe, extension cable and Proximitor Sensor must all be replaced with 3300 XL 25 mm components. |
Required companion components
- 330850-AA-BB: 3300 XL 25 mm Proximitor Sensor, configured for 5 m or 9 m total system length and panel or DIN mounting.
- 330854-AAA-BB-CC: 3300 XL 25 mm extension cable, offered in 4 m or 8 m lengths with FluidLoc cable options.
- 330853-AA-BB: sliding bracket options for differential-expansion applications.
- 330153-08: connector kit for 3300 XL 25 mm probes and extension cables.
RFQ Checklist for a Faster Technical Review
Include the following information in the first enquiry so the offered configuration can be checked without repeated emails:
- Full part number and clear photos of the installed probe label.
- Extension-cable and Proximitor Sensor part numbers.
- Machine type, measurement purpose and installation location.
- Mounting thread, available case clearance, target material and expected movement range.
- Required quantity, destination, requested delivery date and documentation requirements.
- Whether agency approvals, stainless-steel armor or connector accessories are mandatory.
Frequently Asked Questions
1. Is 330851-02-000-080-10-00-00 discontinued?
No official manufacturer discontinuation notice or discontinuation date was identified. Datasheet 163236 Rev. M continues to list the 330851 configurable probe family and the 00 no-approvals option.
2. What does the complete part number specify?
It specifies a 3300 XL 25 mm probe with an M30x2 threaded case, 0 mm unthreaded length, 80 mm overall case length, 1 m total length, no armor and no agency approvals.
3. Can the -05 version replace the -00 version?
330851-02-000-080-10-00-05 is the closest manufacturer-listed alternative because all case and length codes are identical and only the agency-approval option changes. Verify certificate and marking requirements before substitution, especially for regulated installations.
4. Can another 330851 case length or cable length be used directly?
Not automatically. A different case length may change mounting geometry and clearances, while a different probe length changes the extension cable needed to match the Proximitor Sensor's 5 m or 9 m total system length.
5. What must be changed when upgrading an older 25 mm DE system?
For an upgrade from previous 7200 or 25 mm DE integral systems, the manufacturer requires replacement of the probe, extension cable and Proximitor Sensor with 3300 XL 25 mm components. The identical output permits the existing monitor configuration to remain unchanged, subject to project engineering verification.
Verify the complete transducer system before ordering
Send the installed probe label, extension-cable part number, Proximitor Sensor part number, mounting details and approval requirements for a configuration review.
Request a Configuration ReviewSource basis: Bently Nevada / Baker Hughes 3300 XL Proximity Transducer System Datasheet 163236 Rev. M and the manufacturer's 3300 XL 25 mm product information. Technical values are reproduced in summarized form for identification and engineering review. Always confirm the current manufacturer documentation for the complete installed system.
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