Bently Nevada 330876-02-50-00-00 Proximity Probe for 3300 Series

Bently Nevada 330876-02-50-00-00 Proximity Probe for 3300 Series

The Bently Nevada 330876-02-50-00-00 is a precision eddy-current proximity probe engineered for seamless integration within the Bently Nevada 3300 Series vibration monitoring architecture. Designed to deliver continuous, high-resolution shaft displacement and vibration data, this probe serves as a critical sensing node within layered industrial automation systems — connecting the mechanical layer directly to the control and protection layers of rotating machinery management platforms.

In modern industrial facilities — spanning power generation, petrochemical processing, oil and gas compression, and heavy manufacturing — the integrity of rotating equipment monitoring depends on the coherent interaction of every component within the measurement chain. The 330876-02-50-00-00 is not simply a standalone sensor; it is a system-compatible element designed to operate in concert with the 3300 XL 8mm Extension Cable, the 3300 XL Proximitor Sensor (such as the 330180-91-00), the 3300 Series Monitor Rack, and the System 1 Condition Monitoring Software platform. Together, these components form a complete vibration measurement loop that feeds real-time data to protection monitors, DCS interfaces, and plant historians.

The probe’s 8mm tip diameter and standardized output sensitivity (nominally 7.87 V/mm) ensure direct compatibility with Bently Nevada’s 3300 XL signal conditioning ecosystem. When paired with the 330130-080-01-00 extension cable and a 330180 series Proximitor, the complete measurement chain delivers a calibrated, linear output signal suitable for direct input to the 3500/40M Proximitor Monitor or the 3300/16 Dual Voting Monitor — both of which provide relay-based trip outputs for integration with turbine control systems, emergency shutdown (ESD) panels, and DCS platforms such as Emerson DeltaV or Honeywell Experion.

Product Specification Table

System Compatibility Notes

The 330876-02-50-00-00 achieves its full value when deployed as part of a coordinated, multi-layer control architecture. At the sensing layer, the probe mounts directly to the bearing housing or turbine pedestal, providing continuous non-contact measurement of shaft radial vibration and position. The integral 2-meter cable connects to a 330130-080-01-00 extension cable, which routes the signal to the 330180-91-00 Proximitor Sensor mounted in a junction box or directly on the machinery skid.

The Proximitor converts the probe’s impedance-based signal into a calibrated DC voltage output, which is then routed to the 3500 Series Monitoring Rack — typically housing the 3500/40M Proximitor/Velomitor Monitor or the 3500/42M Proximitor/Velomitor Monitor for dual-channel configurations. Within the rack, the 3500/15 Power Supply Module provides regulated DC power to all monitor cards, while the 3500/20 Rack Interface Module manages communication between the rack and the plant DCS via Modbus RTU, FOUNDATION Fieldbus, or Ethernet/IP protocols.

For redundant protection architectures — common in critical turbine-generator sets and centrifugal compressor trains — the 330876-02-50-00-00 is deployed in pairs, feeding independent measurement channels into the 3300/16 Dual Voting Monitor. This 2-out-of-3 or 1-out-of-2 voting logic ensures that a single probe failure does not trigger a spurious trip, maintaining plant availability while preserving protection integrity. The voted output connects directly to the ESD relay panel or the turbine control system’s trip solenoid circuit.

At the supervisory layer, all vibration data collected through the 330876-02-50-00-00 measurement chain is aggregated by the System 1 Condition Monitoring Software, enabling trend analysis, alarm management, and predictive maintenance scheduling. Integration with the plant DCS allows operators to correlate vibration data with process variables — flow, pressure, temperature — for comprehensive machinery health assessment. The 3500 Rack’s built-in Ethernet port supports direct connection to the plant historian (such as OSIsoft PI) without requiring additional gateway hardware.

Industrial Application Notes

In power generation facilities, the 330876-02-50-00-00 is routinely deployed on steam turbine LP and HP rotors, gas turbine compressor stages, and generator bearing pedestals. The probe’s wide operating temperature range (-35°C to +177°C) and ATEX-rated variants make it suitable for installation in hazardous area Zone 1 environments, including offshore gas turbine packages and onshore LNG compressor trains.

In petrochemical and refinery applications, the probe monitors centrifugal pumps, reactor agitators, and large-frame reciprocating compressors. Its compatibility with the 3500 Series rack architecture allows seamless integration into existing Emerson DeltaV or Yokogawa CENTUM VP DCS platforms via the 3500/20 Rack Interface Module, eliminating the need for additional signal conditioning hardware.

In water treatment and municipal utility plants, the 330876-02-50-00-00 is applied to large vertical turbine pumps and blower trains, where continuous vibration monitoring reduces unplanned downtime and extends bearing service intervals. The probe’s long-term stability and low drift characteristics — verified through factory calibration traceable to NIST standards — ensure measurement accuracy over multi-year service periods without recalibration.

In mining and mineral processing, the probe is deployed on SAG mill pinion bearings, crusher main shafts, and conveyor drive gearboxes. The rugged construction and sealed cable assembly resist the high-dust, high-vibration environments typical of underground and open-pit mining operations. Integration with the plant SCADA system via the 3500 rack’s Modbus TCP interface provides real-time vibration alarms to the control room, enabling rapid response to developing faults.

Product Compatibility FAQ

Q1: Is the 330876-02-50-00-00 directly compatible with the 3500 Series monitoring rack without additional signal conditioning?
A: Yes. The 330876-02-50-00-00 is designed to work within the complete Bently Nevada 3300 XL measurement chain. When paired with a compatible 330180 series Proximitor Sensor and connected to a 3500/40M or 3500/42M monitor card, no additional signal conditioning is required. The Proximitor provides the necessary -24 VDC excitation and converts the probe output to a calibrated voltage signal directly compatible with the 3500 rack input specifications.

Q2: Can this probe be used in a redundant 2-out-of-3 voting architecture for critical turbine protection?
A: Yes. The 330876-02-50-00-00 is fully compatible with redundant voting architectures when deployed in sets of three, each feeding an independent channel of the 3300/16 Dual Voting Monitor or the 3500 Series equivalent. The voting logic is configured within the monitor card, and the probe’s consistent output sensitivity ensures that all three channels maintain calibration alignment — a prerequisite for reliable voting operation. ZYPLC can supply matched probe sets with verified sensitivity tolerances upon request.

Q3: What does the warranty terms confirmed during quotation cover, and what is the process for warranty claims?
A: ZYPLC’s warranty terms confirmed during quotation covers manufacturing defects, premature output failure, and calibration drift beyond published specifications under normal operating conditions. The warranty period begins from the date of shipment. To initiate a warranty claim, contact ZYPLC at plc.sales@zyplc.com or +86 19859288691 with the order number, part number, and a description of the observed fault. ZYPLC will arrange for replacement or repair within the warranty period, including return shipping coordination for international customers.