Bently Nevada 330104-05-18-50-02-CN Replacement for 3300 XL

Product Overview

Bently Nevada 330104-05-18-50-02-CN Replacement for 3300 XL: Seamless Transition & Legacy System Compatibility

When your existing Bently Nevada 3300 XL vibration monitoring system reaches end-of-life or a critical probe fails in the field, unplanned downtime is not an option. The Bently Nevada 330104-05-18-50-02-CN is an 8mm eddy-current proximity probe engineered for the 3300 XL Series, offering a verified drop-in replacement path for aging or discontinued probe assemblies. Whether you are managing a turbine train, compressor skid, or rotating machinery protection system, this probe delivers the signal integrity and mechanical compatibility your existing infrastructure demands — without requiring a full system overhaul.

The 330104-05-18-50-02-CN is a 5-metre (18-inch) armored extension cable variant with a standard 8mm tip diameter, designed to interface directly with the Bently Nevada 3300 XL Proximitor® Sensor (such as the 330180 series) and the associated 3300 XL rack-mounted monitor cards. Its output sensitivity of 200 mV/mil (7.87 V/mm) is fully compatible with the signal conditioning expectations of the 3300 XL monitor modules, meaning no recalibration of the monitor card is required when replacing a like-for-like probe in the same mounting boss.

For facilities transitioning from older Bently Nevada 7200 Series or early 3300 non-XL probes, the 330104-05-18-50-02-CN provides a structured upgrade path. The 8mm tip geometry and standard Bently Nevada connector pinout allow direct substitution in most existing probe holders and conduit runs, significantly reducing installation labor. Engineers migrating from the 7200 Series should verify the Proximitor gap voltage range and confirm that the 3300 XL Proximitor sensor is already installed, as the 7200 and 3300 XL systems use different Proximitor models with distinct power supply requirements.

Compatibility Comparison Table

Seamless Upgrade Solutions

A successful 3300 XL probe replacement rarely involves the probe alone. In practice, field engineers replacing the 330104-05-18-50-02-CN will typically audit the full probe-to-monitor signal chain. The Bently Nevada 330180-91-00 Proximitor Sensor is the most common companion component — it conditions the raw eddy-current signal from the probe and delivers a calibrated DC voltage to the monitor rack. If the Proximitor housing shows signs of moisture ingress or connector corrosion, replacing it alongside the probe eliminates a second service call.

Within the 3300 XL rack, the 3300/16 Monitor Module and 3300/20 Dual Voting Logic cards are frequently encountered in turbine protection panels. When a probe is replaced due to a trip event, it is best practice to bench-test the associated monitor card input channel using a probe simulator before returning the machine to service. If the monitor card itself is flagged during diagnostics, the 3300/55 Keyphasor Module and 3300/46M Thrust Position Monitor are common co-located cards that may also require inspection.

For facilities running a hybrid architecture — where a legacy Bently Nevada 1900/65A general-purpose monitor coexists with the 3300 XL rack — the wiring segregation between the two systems must be maintained during probe replacement to avoid ground loop interference. In such installations, a signal isolator module (such as a DIN-rail mounted galvanic isolator) is recommended at the junction between the probe cable conduit and the control cabinet terminal strip.

Where conduit runs are being re-routed during a broader retrofit, the Bently Nevada 330130-080-00-00 extension cable and 330105-02-12-10-02-CN probe (9m variant) are frequently specified as alternatives depending on the physical distance between the probe boss and the Proximitor junction box. Ensuring the total system cable length does not exceed the Proximitor’s rated range is critical for maintaining calibration accuracy.

Finally, for sites upgrading their HMI layer in parallel with the probe replacement, integration of the 3300 XL rack outputs into a Rockwell Automation ControlLogix or Siemens S7-300/S7-1500 PLC via a 4–20mA analog input module is a common modernization step. This allows vibration data to be trended in a plant historian or SCADA system without replacing the Bently Nevada protection hardware.

Retrofit Guidance FAQ

Q: Can I replace the 330104-05-18-50-02-CN without recalibrating the 3300 XL monitor card?
A: Yes, provided the replacement probe is the same model and the Proximitor gap voltage is re-set to the manufacturer’s specified value (typically –10.0 VDC ± 0.5 V at the nominal air gap). The monitor card trip setpoints do not need to be changed for a like-for-like probe swap.

Q: Is the wiring pinout identical to the probe it replaces?
A: Yes. The 330104-05-18-50-02-CN uses the standard Bently Nevada coaxial connector scheme. The center conductor carries the probe signal and the shield is grounded at the Proximitor end only — single-point grounding must be maintained to prevent noise injection.

Q: Can this probe be used with a Bently Nevada 7200 Series Proximitor?
A: No. The 7200 Series Proximitor uses a different calibration curve and power supply voltage. The 330104-05-18-50-02-CN is calibrated for the 3300 XL Proximitor (330180 series). Using it with a 7200 Proximitor will result in incorrect gap voltage and inaccurate vibration readings.

Q: What is the maximum allowable cable length for this probe assembly?
A: The total system cable length (probe + extension) must not exceed the Proximitor’s rated range, typically 5m, 9m, or 15m depending on the Proximitor model ordered. The 330104-05-18-50-02-CN is a 5m system — do not add additional extension cable beyond the rated length.

Q: How do I verify the probe is functioning correctly after installation?
A: Use a Bently Nevada probe tester or a calibrated DC power supply and voltmeter to verify the gap voltage at the Proximitor output. The probe should produce a linear voltage response as the target distance is varied. Compare readings against the 3300 XL calibration curve for 8mm probes on AISI 4140 steel targets.

Q: Is physical space in the control cabinet a concern during replacement?
A: The probe itself is installed at the machine, not in the cabinet. However, the Proximitor junction box and conduit entry points should be inspected for adequate bend radius on the armored cable. The 330104-05-18-50-02-CN armored cable has a minimum bend radius of approximately 50mm — ensure the conduit routing accommodates this.

Warranty Assurance

Every Bently Nevada 330104-05-18-50-02-CN unit shipped by TOPNLMS is covered by a 12-month warranty from the date of delivery. Prior to dispatch, each unit undergoes a multi-point outgoing inspection including visual examination of the probe tip, connector integrity check, cable continuity test, and packaging verification to ensure the unit arrives in field-ready condition.

In the event of a confirmed defect within the warranty period, TOPNLMS will arrange a replacement unit or issue a credit note — whichever resolution best minimizes your operational impact. Our technical support team is available to assist with installation queries, compatibility confirmation, and gap-setting guidance before and after delivery.

Stock is maintained in Xiamen, China, with standard lead times of 3–7 business days for international express shipments (DHL / FedEx). Expedited same-day dispatch is available for orders confirmed before 14:00 CST. All units are shipped with a packing list, inspection report, and certificate of conformance upon request.

For bulk procurement, long-term supply agreements, or urgent replacement sourcing, contact our industrial parts team directly to discuss pricing, lead time, and consignment stock arrangements.