174985-03-13-50 Bently Nevada 3300 XL 25 mm Underwater Probe

Bently Nevada 174985-03-13-50 — 3300 XL 25 mm Underwater Proximity Probe

The Bently Nevada 174985-03-13-50 is a 3300 XL 25 mm underwater proximity probe designed for machinery measurement points where the probe body may be submerged or exposed to fluids. Its sealed case and attached Tefzel tubing protect the probe assembly and cable section under the specified installation conditions.

This configuration uses a 1.25-12 UNF thread, a 0.3-inch unthreaded length, a 1.3-inch overall case length, and a 5.0 m total length. These dimensions are important when matching an existing mounting arrangement, maintaining probe-to-target geometry, and confirming the complete measurement chain.

Critical installation boundary: The connector end is not sealed against liquids and must not be submerged. The probe case is made from 304 stainless steel and is not suitable for salt-water applications.

01 | Configuration Breakdown

Full catalog number: 174985-03-13-50

174985 → 03 → 13 → 50

Selection note: The 0.3-inch unthreaded length and 1.3-inch overall case length are separate dimensions. Verify both against the installed probe, mounting hardware, and available clearance. Do not select a replacement based only on the thread size or overall appearance.

02 | Technical Specification Sheet

03 | Mechanical Fit and Installation Geometry

For this short-case configuration, dimensional verification is particularly important. The mounting thread, unthreaded section, case length, and available installation depth must all match the machine's design.

• Thread engagement: Confirm the 1.25-12 UNF mounting thread and the condition of the mating port.
• Available clearance: Check that the case and cable exit can be installed without interference with guards, adjacent components, or moving parts.
• Probe position: Verify the specified probe gap and target geometry according to the applicable 3300 XL system documentation.
• Cable routing: Route the 5 m assembly to avoid abrasion, sharp bends, crushing, and unintended strain on the cable or connector.
• Measurement chain: Verify compatibility with the intended extension cable, Proximitor sensor, and monitoring channel.

Use the original installation drawing or the manufacturer's dimensional documentation to confirm the final mounting arrangement. The catalog dimensions alone do not define the complete probe-to-target installation.

04 | Fluid Exposure, Pressure and Material Limits

The stated nitrogen pressure rating should not be interpreted as a universal pressure rating for every fluid, temperature, or installation. If the process uses a different medium or requires higher pressure, verify the actual sealing configuration and test requirements before installation.

05 | Machinery Applications

The 174985 configuration may be considered for compatible 3300 XL proximity measurement points where the probe body is exposed to fluids and the mounting geometry suits the short-case design.

• Fluid-exposed rotating machinery: Probe installations where the case may be submerged or exposed to compatible fluids.
• Pump and process equipment: Shaft-displacement measurement points that meet the probe's mechanical, electrical, and environmental requirements.
• Machinery protection systems: A compatible sensing element within a configured proximity measurement channel.
• Wet machinery enclosures: Applications where the probe case requires fluid exposure protection but the connector can remain outside the liquid.
• Maintenance replacement: Replacing an existing 174985 configuration after verifying thread, lengths, cable arrangement, and the full measurement chain.

Actual suitability depends on target material, mounting geometry, fluid chemistry, operating pressure, temperature, and the installed monitor system. These application examples do not establish compatibility with every pump, compressor, or machinery protection platform.

06 | Measurement Chain Verification

A proximity probe operates as part of a configured measurement channel. Before commissioning or replacement, confirm the following chain:

174985-03-13-50 probe → Compatible extension cable → Compatible Proximitor sensor → Monitoring channel

• Confirm that the probe model and cable configuration match the required 3300 XL system.
• Verify total cable length and the applicable system requirements.
• Check that the Proximitor sensor and monitor channel are configured for the correct probe system.
• Confirm mounting position, target clearance, and probe gap against the approved procedure.
• Record baseline readings after installation so future maintenance can distinguish a new fault from an existing machine condition.

07 | Troubleshooting: Isolate the Fault Before Replacement

Diagnostic method: Inspect the installation and environmental exposure first, then check the cable and connector, verify the matched Proximitor and monitor channel, and review the target geometry. An abnormal reading alone does not establish that the probe has failed.

08 | Hazardous-Area Installation Considerations

The supplied 3300 XL probe approval information includes the following classifications and installation conditions:

• Intrinsic safety: Class I, Zone 0; AEx/Ex ia IIC T5...T1 Ga.
• Additional classifications: Class I, Groups A, B, C, and D; Class II, Groups E, F, and G; Class III.
• Installation requirement: Use intrinsically safe zener barriers in accordance with drawing 141092 or suitable galvanic isolators, as applicable to the approved system configuration.
• Zone 2 markings: nA, ec Class I, Zone 2; AEx/Ex nA IIC T5...T1 Gc; Class I, Division 2, Groups A, B, C, and D; and Class I, Zone 2 AEx/Ex ec IIC T5...T1 Gc.

Confirm the approvals applicable to the exact supplied item, temperature schedule, barrier or isolator requirements, and installation drawing. The probe's approval information does not independently establish certification of the complete measurement loop.

09 | Global PLC Spare HUB's Insight

For the 174985-03-13-50, the main replacement risk is a dimensional mismatch. The 0.3-inch unthreaded length and 1.3-inch overall case length define a specific mechanical configuration. A probe with the same series name but a different suffix may not fit the existing mounting arrangement or maintain the required measurement geometry.

Before ordering, compare the full part number against the installed probe and verify the mounting port, cable routing, and compatible Proximitor system. For fluid-exposed installations, inspect the connector location as part of the installation review. The sealed case does not make the connector end suitable for immersion, and the supplied specification excludes salt-water service.

For recurring measurement problems, keep a record of probe gap, normal operating readings, fluid exposure, maintenance work, and any changes to the cable or monitoring channel. This information can help distinguish a mechanical installation issue from an electrical mismatch or a genuine probe failure.

10 | Frequently Asked Questions

Q1: Why does the 174985-03-13-50 require a dimensional check even when the thread matches?

Thread compatibility alone does not confirm correct installation. The unthreaded length, overall case length, available clearance, and probe-to-target position all affect the mechanical fit. Compare the complete dimensions with the installed mounting arrangement before ordering.

Q2: Can I replace this probe with another 3300 XL model that has the same total cable length?

Not without checking the full configuration. Thread type, case geometry, probe-system compatibility, and the matched extension cable and Proximitor all matter. Use the complete part number and applicable system documentation to confirm the replacement.

Q3: What should I do if the probe is exposed to a fluid other than water?

Confirm the fluid's chemical compatibility with the probe materials and sealing arrangement. The supplied specification identifies a 304 stainless-steel case and explicitly excludes salt-water applications. Do not assume that suitability for one fluid establishes suitability for another.

Q4: How should I assess a suspected pressure-seal problem?

Record the operating pressure, process medium, temperature, and observed leakage or seal symptoms. Compare these conditions with the specified 34 bar nitrogen rating and contact the supplier if a different pressure-seal test or configuration is required. Do not exceed verified limits based solely on the nominal rating.

Q5: What information is most useful for confirming a replacement order?

Provide the complete catalog number, required quantity, mounting dimensions, total cable length, compatible extension cable and Proximitor details, operating temperature, process fluid, pressure conditions, and hazardous-area requirements. This allows the supplier to review both physical fit and system compatibility.

11 | Ordering, Warranty and Shipping

• Part number: 174985-03-13-50
• Product: Bently Nevada 3300 XL 25 mm underwater proximity probe
• Warranty: 12 months, subject to the seller's written warranty terms.
• Shipping methods: FedEx, UPS, and DHL.
• Dispatch target: 24–48 hours after order and payment confirmation, subject to stock availability and order processing.

Request a quote: Send the full model number 174985-03-13-50, required quantity, destination, and application details to help verify the configuration before ordering.

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