Bently Nevada 330195-02-12-50-CN Retrofit-Ready Proximity Probe for 3300 XL Control Systems
The Bently Nevada 330195-02-12-50-CN is an 8mm reverse-mount proximity probe engineered for seamless integration into legacy and active 3300 XL vibration monitoring systems. As aging machinery protection platforms approach end-of-life or face discontinued OEM support, this probe serves as a verified drop-in replacement that preserves existing wiring infrastructure, signal conditioning chains, and Bently Nevada monitor compatibility — minimizing retrofit risk and eliminating the need for full-system overhauls.
Industrial facilities operating rotating machinery — including turbines, compressors, pumps, and gearboxes — rely on continuous shaft displacement monitoring to prevent catastrophic failure. When the original 330195-02-12-50-CN probe degrades or becomes unavailable through standard OEM channels, sourcing a compatible replacement with confirmed electrical and mechanical specifications is critical. This unit maintains the standard 5-metre (50-inch) integral cable length, reverse-mount configuration, and the eddy-current sensing characteristics required by the 3300 XL monitor series.
Upgrade Compatibility Table
| Parameter | 330195-02-12-50-CN Specification | Retrofit Notes |
|---|---|---|
| Probe Type | 8mm Eddy-Current Proximity Probe | Direct replacement for 330180 and 330101 series in compatible brackets |
| Mount Configuration | Reverse Mount | Verify bracket orientation before installation; forward-mount housings require adapter |
| Cable Length | 50 inches (approx. 1.27 m integral) | Match to existing conduit routing; extension cables (330130 series) may be required |
| Thread Size | M12 x 1 | Confirm probe holder thread compatibility; re-tap if corroded |
| Gap Voltage Range | −10 VDC nominal at 1.0 mm gap | Re-gap to OEM spec after installation; use gap voltage meter during commissioning |
| Monitor Compatibility | 3300 XL Series (3300/16, 3300/20, 3300/25, 3300/55) | Confirm monitor channel configuration matches probe sensitivity (200 mV/mil or 7.87 V/mm) |
| Communication Protocol | Analogue (4–20 mA / voltage output via monitor) | No firmware update required; signal chain remains unchanged |
| Warranty | 12 Months | Covers manufacturing defects; includes pre-shipment functional test report |
Retrofit Planning for Existing Automation Systems
Successful integration of the 330195-02-12-50-CN into an existing machinery protection system requires a structured pre-installation review. Begin by auditing the current probe holder and proximitor housing to confirm the M12 thread engagement depth and radial clearance. In many legacy installations, the proximitor — typically a Bently Nevada 330180-X0-05 or 330180-X0-CN extension cable assembly — connects the probe to the 3300 XL monitor rack via a dedicated I/O terminal block. Verify that the extension cable is undamaged and that the connector seating is secure before energising the channel.
Within the monitor rack, the 3300 XL series accepts probe inputs through dedicated channel cards. Confirm that the channel card — such as the 3300/16-02-01-00-00-00 or 3300/20 dual-channel card — is configured for the correct transducer type and sensitivity. If the rack also houses a 3300/55 Keyphasor module, verify that the reference signal timing is unaffected by the probe swap. For systems integrated with a DCS or safety instrumented system (SIS), the 4–20 mA analogue output from the monitor should be loop-checked against the DCS I/O card termination to confirm signal continuity before returning the machine to service.
Where the control system interfaces with a Bently Nevada System 1 condition monitoring platform, the probe replacement does not require software reconfiguration provided the channel sensitivity and gap voltage remain within the original calibration envelope. However, if the installation involves migrating from an older 7200 series probe to the 3300 XL platform, a full channel recalibration and System 1 database update will be necessary. In such cases, also review the HMI display configuration to ensure that alarm setpoints and trend displays reflect the updated probe characteristics.
For facilities running Rockwell Automation or Siemens S7-series PLCs in parallel with the Bently Nevada monitoring system, the analogue input modules receiving vibration signals — such as a 1756-IF16 ControlLogix card or a Siemens SM 331 analogue input module — should be verified for correct scaling and engineering unit conversion after the probe is replaced. This is particularly important in systems where the PLC logic triggers protective shutdown sequences based on vibration amplitude thresholds.
Downtime Control During System Migration
Minimising unplanned downtime during a probe replacement requires pre-staging all components before the maintenance window opens. Confirm that the replacement 330195-02-12-50-CN, the appropriate extension cable, and any required probe holders or lock nuts are on-site and functionally tested before the machine is taken offline. Where possible, perform a bench-level continuity and gap voltage check on the replacement probe using a portable oscillator/driver unit to validate probe sensitivity before installation.
During the swap, preserve the original PLC and DCS programme logic without modification. The probe replacement is a hardware-level change; no ladder logic, function block, or structured text modifications should be required unless the channel address or I/O mapping has changed due to rack reconfiguration. If the monitor rack is being reorganised as part of a broader control cabinet upgrade, document the original channel assignments and replicate them precisely in the new configuration to avoid alarm mapping errors.
After installation, perform a live gap voltage verification with the machine at rest, then conduct a slow-roll check to confirm that the vibration signal is clean and within the expected baseline range. Log the commissioning data — including gap voltage, slow-roll amplitude, and phase reference — in the site maintenance record before returning the machine to full-speed operation. This documentation supports warranty claims and provides a baseline for future predictive maintenance trending.
Retrofit Support FAQ
Q: Is the 330195-02-12-50-CN a direct replacement for the 330180 series probes?
A: The 330195-02-12-50-CN is compatible with 3300 XL monitor systems and shares the same 8mm eddy-current sensing principle as the 330180 series. However, the reverse-mount configuration and cable length differ. Confirm probe holder geometry and extension cable compatibility before ordering.
Q: Does this probe require recalibration after installation?
A: Yes. After mechanical installation, the probe gap must be set to the OEM-specified voltage (typically −10 VDC at 1.0 mm gap) using a calibrated gap-setting tool. A full channel calibration check against the 3300 XL monitor is recommended before returning the machine to service.
Q: What is included in the pre-shipment testing?
A: Each unit undergoes a functional test covering probe sensitivity, cable continuity, and connector integrity. A test report is available upon request. All units are covered by a 12-month warranty against manufacturing defects from the date of shipment.
Q: Can this probe be used in hazardous area (ATEX/IECEx) installations?
A: The standard 330195-02-12-50-CN is not ATEX-certified. For hazardous area applications, consult the Bently Nevada 330900 series or confirm the applicable area classification with your site safety engineer before installation.
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