Description
Note: Many products are not yet listed. Please contact us for more product information. Our supply channels are constantly expanding, and we currently have 20 stable shared supply channels. Please confirm the model, product, price, and all other necessary information with customer service before placing an order. We offer new, refurbished, and used products, and prices are adjusted according to the year of the item you require.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Transducer Type | 3300 XL 8mm Eddy Current Proximitor |
| Matched Probe | 3300 XL 8mm proximity probe |
| Total System Length | 9 meters |
| Supply Voltage | -17.5 VDC to -26 VDC |
| Power Draw | 1.5 W nominal |
| Sensitivity | 7.87 V/mm (200 mV/mil) |
| Frequency Response | 0 Hz to 10 kHz |
| Mounting | DIN rail or panel mount |
| Output | Linear voltage proportional to gap distance |
| Operating Temperature | -40°C to +85°C |
| Agency Compliance | API 670, CE, UL, CSA |
| Status Indicators | OK LED for power and transducer health |
Product Introduction
The Bently Nevada 330108-91-05 is a 3300 XL proximitor that pairs with an 8mm eddy current probe and extension cable. It conditions the probe signal and outputs a linear voltage reading for shaft radial vibration, thrust position, eccentricity, and Keyphasor speed.
In my experience, this unit maintains stable linearity over the full probe gap range. It sends transducer fault flags directly to the monitoring rack, so operators catch broken cables or probe damage before machinery damage develops.
330108-91-05
330108-91-05
330108-91-05
Application Scenarios & Field Experience
Fluid-film bearing rotating machines rely on continuous proximity readings. A failed proximitor breaks vibration and thrust monitoring, forcing operators to run without protection and trigger automatic machine trips on high deviation.
- Thermal power generation: Steam turbine thrust bearing and journal vibration monitoring
- Oil & gas compression: Centrifugal compressor shaft radial vibration and position tracking
- Combined cycle facilities: Gas turbine rotor eccentricity and speed Keyphasor pickup
- Refinery pump trains: Critical process pump bearing vibration protection
I supported a compressor train last spring where this proximitor developed internal drift. Vibration readings wandered randomly while the actual shaft motion stayed steady. We installed a calibrated spare, re-set the probe gap, and validated linearity with a micrometer test fixture. All protection points returned stable within 14 minutes. No compressor trip occurred.
Standard Operating Procedure (SOP) for Quality Control
- Visual & Origin Inspection: Check OEM laser marking, connector condition, and housing integrity. Reject units with scratched labels or reworked internal wiring.
- Live Rig Testing: Connect to a matched 8mm probe and micrometer gap fixture. Verify linear output across the full calibrated gap range and confirm OK lamp status.
- Firmware / Calibration Verification: Confirm the unit’s factory calibration matches the 3300 XL 8mm 9m system configuration.
- ESD-Safe Packaging: Place the proximitor in static shielding bag, protect BNC connector with a cap, and pack in rigid foam-lined carton. Include calibration test record with shipment.
Frequently Asked Questions
Q1: Can I use this 330108-91-05 with a shorter 5m probe cable assembly? A: No. The part number suffix locks the total calibrated system length. Mixing cable lengths breaks linearity and creates false vibration alarms. Use only 9m matched probe and extension sets.
Q2: What warranty applies to this proximitor sensor? A: We offer a 12-month warranty. The warranty does not cover damage from reverse polarity supply, shorted probe cables, or physical impact on the BNC connector.
Q3: What is the stock and shipping timeline if I place an order? A: If marked in stock, it can leave our warehouse within 1–2 business days. Transit lead time depends on destination. Confirm stock status through our website before scheduling machine downtime.
Q4: Will this proximitor work with older 3300 non-XL probes? A: It is not designed for legacy non-XL probes. The drive circuit and calibration curve differ. Mismatched probes will produce incorrect gap readings and intermittent transducer faults.
Q5: Can I hot-swap this proximitor while the turbine or compressor remains online? A: Hot-swap is permitted only if the associated vibration and thrust protection points are bypassed. If protection remains active, removing this unit will trigger immediate machinery shutdown.
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