Product Core Brief

• Model: 330104-00-14-10-02-05
• Brand: Bently Nevada
• Series: 3300 XL 8mm
• Core Function: Measures non-contact shaft relative vibration and axial position using eddy-current technology.
• Product Type: Proximity Probe / Sensor
• Key Specs: 8mm Tip Diameter | 200 mV/mil Sensitivity | 14mm Thread Length
• Condition: New Surplus / Original OEM

Key Technical Specifications

• Manufacturer: Bently Nevada
• Part Number: 330104-00-14-10-02-05
• Product Category: Eddy-Current Proximity Probe
• System Architecture: 3300 XL 8mm Sensor System
• Tip Diameter: 8 mm (0.315 in)
• Sensitivity: 200 mV/mil (7.87 mV/µm)
• Linear Range: ~80 mils (2.0 mm)
• Thread: M10 x 1
• Cable Length: 14 ft (4.3 m) [Derived from ’14’ in P/N]
• Operating Temp: -40°C to +177°C (-40°F to +350°F)
• Compliance: API 670 / CE / CSA

Product Introduction (No Fluff)

This 330104-00-14-10-02-05 serves as the primary sensing element in a Bently Nevada 3300 XL 8mm system, detecting shaft relative vibration and axial position without physical contact. It relies on eddy-current impedance changes to provide high-fidelity dynamic and static position data to the proximitors.

Sourcing this exact OEM replacement part prevents false trips and data loss when probe coils degrade or cables suffer insulation failure. Keeping verified new surplus stock on hand drastically reduces unplanned downtime during critical sensor failures or when expanding monitoring coverage.

QA & Testing SOP (Dynamic & Transparent)

Proximity probes are passive but precision-critical. Every 330104-00-14-10-02-05 undergoes an inbound anti-counterfeit inspection, verifying the tip epoxy, cable jacket markings, and connector integrity against Bently baselines. Next, we perform a DC resistance check and insulation impedance test (>2 MΩ) to ensure no internal shorts or moisture ingress. We then verify the sensitivity curve using a calibrated oscillator and target simulator to confirm the 200 mV/mil output is within tolerance. Finally, a visual inspection of the tip face ensures no scratch

es or oxidation that would distort the gap voltage. All units ship in anti-static shielding with a printed QA test report.

Installation Pitfalls & Guide (Engineer to Engineer)

❗ Gap Voltage Target: The most common field error is setting the gap voltage to an arbitrary value. For an 8mm probe with 200 mV/mil sensitivity, you must set the static gap voltage to -10.0 VDC ± 0.2 VDC (or the specific midpoint listed on the probe’s calibration sheet). This centers the probe in its linear range, allowing symmetric positive/negative vibration swing.

❗ Ground Loops & Shielding: The probe shield must be grounded at the proximitors only. Grounding the shield at the probe bracket creates a ground loop that injects 50/60 Hz hum directly into your vibration signal. Verify your bracket is floating or isolated from the machine ground if necessary.

❗ Thread Engagement & Torque: The M10x1 thread is fine-pitch. Cross-threading or over-torquing (>2.3 N·m) can crack the internal ceramic insulator or damage the coil. Use a torque wrench, not just finger-tight plus a wrench. Ensure the O-ring on the connector is seated; a missing O-ring leads to moisture ingress and eventual open-circuit failure.

Replacement Protocol:

1. Pre-Install: Lock out the proximitors power. Verify 0 VDC at the extension cable. Inspect the mounting hole threads for debris.
2. Removal: Unscrew the old probe. Inspect the extension cable connector for bent pins or corrosion.
3. Install: Hand-thread the 330104-00-14-10-02-05 into the bracket. Torque to spec. Connect the extension cable and verify the O-ring seal.
4. Power-on Test: Restore proximitors power. Monitor the gap voltage on the front panel or DMM. Adjust the probe depth until -10.0 VDC is achieved. Lock the jam nut while holding the probe body to prevent rotation.

Technical FAQ

Is this an exact drop-in replacement for my older 330104 probe?
Yes, provided your existing system is 3300 XL 8mm with 200 mV/mil sensitivity. The “14” in your part number indicates a 14-foot cable length; verify this matches your run distance. If you are replacing a 3300 (non-XL) probe, check the sensitivity match, as older 5mm or 11mm probes have different output curves.

Why is this listed as “New Surplus” instead of factory-new?
This is genuine Bently Nevada stock that was never deployed on a turbine or compressor. It has been stored in climate-controlled inventory rather than exposed to oil mist, steam, and vibration. You receive the exact same calibration stability and lifespan as a factory-fresh unit, typically at a significantly lower cost and without the 12-week lead time.

Can I hot-swap this probe while the proximitors are powered?
Technically yes, but don’t. Disconnecting the probe under power can cause a transient voltage spike that may damage the proximitors’ internal oscillator or input stage. It takes 30 seconds to power down the channel. Do it safely.

What is the warranty coverage on this part?
We provide a standard 12-month functional warranty. If the probe fails open, shorted, or drifts out of calibration under normal operating conditions within that window, we replace it. Our QA testing proves the probe met sensitivity specs before it left our bench.

My vibration readings are noisy. Is this probe bad?
Not necessarily. Before replacing the 330104-00-14-10-02-05, check the extension cable for continuity and shield integrity. Verify the proximitors’ gap voltage is stable. Noise is often caused by a loose connector, a grounded shield at the wrong end, or EMI from a nearby VFD. Only replace the probe if electrical tests confirm an internal coil fault.

Need me to pull up the 330104-00-14-10-02-05 calibration sheet or the gap voltage adjustment procedure? That usually comes up right before final lock-nut tightening.