330878-51-05 BENTLY NEVADA

330878-51-05 Bently Nevada Digital Input Module

Brand：BENTLY NEVADA Model number：330878-51-05

Country of origin: U.S. Product weight：0.55kg

HS code：8517623990

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Product Details：

Product Dimensions：

The 330878-51-05 proximity probe forms part of a complete three-component transducer system, which includes the probe, an extension cable, and a Proximitor sensor. It operates by generating a high-frequency electromagnetic field at the probe tip. When a conductive metal target, such as a turbine or pump shaft, enters this field, eddy currents are induced in the target material, altering the field's strength. The Proximitor sensor converts this change into a linear voltage signal that is directly proportional to the distance between the probe tip and the target. The 330878-51-05 model features a robust construction designed to withstand extreme temperature variations, oil submersion, and chemical exposure commonly found inside industrial machine housings.

Product Parameters

System Compatibility: Bently Nevada 3300 XL $8 \text{ mm}$ Proximity Transducer System
Thread Size and Body Style: $3/8-24$ UNF English thread configuration
Unthreaded Length: $5.1 \text{ inches}$ (indicated by the 51 option code)
Overall Case Length: $0.5 \text{ inches}$ threaded case length or custom body proportion matching the overall length design
Total Length: $0.5 \text{ meters}$ ( $1.6 \text{ feet}$ ) integral cable length (indicated by the 05 option code)
Scale Factor: Standard $7.87 \text{ V/mm}$ ( $200 \text{ mV/mil}$ ) when connected to the corresponding 3300 XL Proximitor Sensor and target material
Linear Range: $2.0 \text{ mm}$ ( $80 \text{ mils}$ ), starting at approximately $0.25 \text{ mm}$ ( $10 \text{ mils}$ ) from the probe tip
Operating Temperature: $-51\text{°C}$ to $177\text{°C}$ ( $-60\text{°F}$ to $350\text{°F}$ ) for the probe tip and integral cable
Connector Type: Miniature coaxial connector with ClickLoc protective sleeve

Product Advantages

A major advantage of the Bently 330878-51-05 is its exceptional linearity and temperature stability, providing highly accurate vibration and gap measurements across a wide thermal operating envelope. The ClickLoc connector system prevents the cable connection from loosening due to machine vibration, ensuring uninterrupted signal transmission.

The probe features a patented TipLoc molding method that provides a mechanical bond between the probe tip and the probe body, preventing tip detachment under harsh fluid flow or mechanical shock. Furthermore, its complete physical inter-changeability allows replacement of individual components without needing to recalibrate the entire transducer system, significantly reducing maintenance setup times.

Important Considerations and Precautions

When installing the 330878-51-05, care must be taken regarding mechanical clearance and electrical interference. The probe tip must be mounted with sufficient radial clearance from adjacent metal structures to avoid side-viewing, which distorts the electromagnetic field and compromises measurement accuracy.

Always observe the maximum tightening torque specifications for the $3/8-24$ UNF mounting threads to prevent stripping or damaging the stainless steel body. Ensure that the total system length—combining the integral probe cable and extension cable—matches the requirements of the specific Proximitor sensor (typically $5 \text{ meters}$ or $9 \text{ meters}$ total system length).

Protect the coaxial connectors from fluid ingress and dirt by using the supplied insulating sleeves or field-installed connector protectors. Avoid tight bend radiuses on the integral cable to prevent inner conductor breakage or impedance shifts.

Product Applications

The Bently 330878-51-05 proximity probe is widely deployed across heavy process industries for machinery health monitoring and automated protection systems.

Steam and Gas Turbines: Continuous monitoring of shaft radial vibration, axial thrust position, and keyphasor speed measurements.
Centrifugal and Reciprocating Compressors: Measuring shaft deflection, bearing wear, and dynamic vibration levels in high-pressure gas service.
Large Industrial Pumps and Fans: Monitoring shaft orbit and vibration signatures to prevent catastrophic bearing or seal failure.
Gearboxes: Measuring high-speed shaft alignment, shaft position, and casing-to-shaft relative motion.
Electric Motors and Generators: Interfacing with machinery protection systems such as the Bently Nevada 3500 platform for continuous real-time asset monitoring.

3500/53-03-0 Bently Nevada

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