Description
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3. Key Technical Specifications
Confirm each line against the OEM datasheet and the marking on your existing probe. The suffix string defines the cable length, connector, and armor, and those must match your installation.
| Parameter | Value |
|---|---|
| Model | 330103-00-03-05-02-05 |
| Brand | Bently Nevada |
| Product Family | 3300 XL 8 mm proximity probe |
| Probe Type | Eddy current proximity probe |
| Tip Diameter | 8 mm |
| Mounting Thread | 3/8-24 UNF — verify on the probe label |
| Cable Length | Verify — the suffix string defines the cable length; confirm on the cable jacket |
| Connector Type | Verify — connector style varies by suffix |
| Cable Armor | Verify — armored or unarmored per suffix |
| Linear Range | Verify with OEM datasheet — 3300 XL 8 mm class |
| Sensitivity | Verify with OEM datasheet — confirm the scale factor for your Proximitor |
| Frequency Response | Verify with OEM datasheet |
| Operating Temperature | Verify — probe and cable ratings differ; confirm on the OEM datasheet |
| Matched System | Requires a matching extension cable and Proximitor sensor — verify part numbers |
| Certifications | Verify on the specific unit’s label — hazardous area ratings may apply |
4. Product Introduction
The Bently Nevada 330103-00-03-05-02-05 is an 8 mm proximity probe from the 3300 XL series. It measures shaft vibration, radial position, axial thrust, or eccentricity on turbines, compressors, and pumps using the eddy current principle. The suffix string defines the cable length, connector, and armor for this build.
The engineering value is the matched-system calibration. The probe, extension cable, and Proximitor form a set, and the total cable length determines the scale factor. A probe with the right thread and the wrong cable length will install cleanly and still read incorrectly.
330103-00-03-05-02-05
330103-00-03-05-02-05
330103-00-03-05-02-05
5. Application Scenarios & Field Experience
Part 1 – Narrative Paragraph
The failure that causes the most false trips on a proximity probe system is not the probe itself — it is a mismatched extension cable or a Proximitor calibrated for a different total cable length. I have seen a plant replace a probe with the correct part number and still get a “not OK” indication because the extension cable was a different length than the one the Proximitor was configured for. On Bently Nevada systems, the probe, the extension cable, and the Proximitor form a matched set. Change one and you change the calibration. That is the rule that matters more than any single specification on the datasheet.
Part 2 – Numbered List (Application Scenarios)
- Power Generation – Steam Turbine Bearing Monitoring – The probe measures shaft vibration and axial position on turbine bearings. It feeds the 3500 rack for protection and trending.
- Oil & Gas – Centrifugal Compressor Protection – Used to monitor radial vibration and thrust position on compressors. The 8 mm probe fits standard bearing housings and the matched Proximitor provides the calibrated signal.
- Petrochemical – Reciprocating Compressor Monitoring – The probe measures rod position and crosshead vibration. The cable length and connector must match the existing installation to avoid a calibration error.
- Hydroelectric – Hydro Turbine Eccentricity – Used to measure shaft eccentricity and bearing clearance on hydro units. The probe’s thread and cable routing must match the bearing bracket.
Part 3 – Short Field Story
A gas plant had a compressor that would trip on “high radial vibration” after every maintenance shutdown. The crew had replaced the probe and the extension cable and the fault kept returning. We asked for the full suffix string on the probe and the Proximitor part number. The replacement probe had a different cable length than the original, and the Proximitor was still calibrated for the old length. The system was reading a scaled signal that looked like a real vibration event at start-up. Once the correct probe and cable set was installed and the Proximitor verified, the trips stopped. The hardware had been fine — the calibration was wrong.
6. Standard Operating Procedure (SOP) for Quality Control
- Visual & Origin Inspection – We verify the Bently Nevada marking, the full 330103-00-03-05-02-05 string, and the date code. We inspect the probe tip, cable jacket, and connector for damage. A probe with a bent tip, cracked connector, or damaged cable jacket is rejected.
- Live Rig Testing – We mount the probe on a calibrated target and verify the linear range and sensitivity against a known displacement. We check the gap voltage at mid-range and confirm the output tracks the target movement.
- Firmware and Configuration Verification – The probe itself carries no firmware; we document the Proximitor and rack configuration where supplied. We record the total cable length and the scale factor so you can compare it against your system.
- ESD-Safe Packaging – The probe is wrapped in anti-static film, coiled to the specified bend radius, and secured in a rigid container with the tip protected. The package is labeled with the full part number and cable length.
7. Frequently Asked Questions (FAQ)
Q1: Is this probe a direct replacement for my existing 3300 XL 8 mm probe?
A: Only if the full suffix string matches, including the cable length, connector, and armor. The probe, extension cable, and Proximitor form a matched set, and a different cable length changes the calibration. Read the full string off your existing probe and compare it character for character before you order.
Q2: What is the warranty on this probe?
A: We offer a 12-month warranty from the ship date. It covers manufacturing defects under normal operating conditions. It does not cover damage from incorrect installation, mechanical impact, or operation beyond the rated range. The warranty is void if the probe shows evidence of overvoltage or physical damage. Every probe ships with a test report.
Q3: Do you actually have this in stock?
A: Bently Nevada probe inventory moves quickly, and stock varies by cable length and connector. Confirm availability before you plan an outage. If we are out of the exact configuration you need, we will tell you what we actually have rather than quote a date we cannot hold.
Q4: What if my Proximitor is calibrated for a different total cable length?
A: Then the reading will be scaled incorrectly. The Proximitor must match the total cable length of the probe plus extension cable. Either match the probe and cable to the existing Proximitor or recalibrate the Proximitor for the new length. Do not assume any 3300 XL probe will calibrate with your existing Proximitor.
Q5: Any installation pitfalls I should watch for?
A: Four. First, verify the mounting thread and the probe gap before you tighten the locknut — overtorque damages the probe tip. Second, route the probe cable away from high-voltage wiring and secure it at the original clamp points; a cable that rubs will fail in weeks. Third, ground the cable shield at one end only to avoid a ground loop. Fourth, after the swap, verify the gap voltage and the vibration reading against a known reference before you return the protection system to service. A probe that powers up is not necessarily giving correct data.
