Bently Nevada 330104 Modules - 330104-04-12-05-01-05

Technical Dossier

Product Details And Specifications

Bently Nevada 330104 Series Technical Notes

The Bently Nevada 330104 series represents one of the most widely deployed proximity probe product lines in global heavy industry. Manufactured under the Baker Hughes (formerly GE) Bently Nevada brand, the 330104 series is a component of the 3300 XL 8mm Proximity Transducer System — a platform that has achieved dominant installed-base status in rotating machinery protection across petrochemical refineries, nuclear power stations, offshore platforms, LNG terminals, and large-scale chemical processing facilities.

The 330104 probe is a passive eddy-current sensor designed to measure radial shaft vibration, axial position (thrust), and differential expansion in turbomachinery including steam turbines, gas turbines, centrifugal compressors, and large induction motors. Its 8mm tip diameter and standardized cable/connector interface make it the default specification in most OEM turbomachinery packages built between 1995 and the present day. Global installed base estimates place the 3300 XL platform — of which the 330104 is the primary probe component — in excess of 200,000 measurement points worldwide.

The Evolution of 330104 Architecture

The 330104 series is the successor to the earlier Bently Nevada 7200 series and 3300 5mm probe systems. The transition to the 3300 XL 8mm platform in the mid-1990s addressed key limitations of earlier designs: improved signal-to-noise ratio at high shaft speeds, extended temperature range for hot-section turbine applications, and a standardized 5-meter armored extension cable system that simplified field replacement without recalibration.

The 330104 probe operates in conjunction with the 330130 or 330180 extension cable and a dedicated proximitor/oscillator-demodulator (the 330180 or 3300 XL proximitor). This three-component architecture — probe, extension cable, proximitor — must be treated as a matched system. Substituting components from different series (e.g., pairing a 330104 probe with a 7200 series proximitor) will produce calibration errors and is not supported by Bently Nevada.

From a lifecycle perspective, the 330104 series entered its maturity phase circa 2010. The platform remains in active production and is supported by Baker Hughes, but the broader 3300 XL ecosystem has been supplemented by the 3500 series rack-based monitoring system for new installations requiring integrated machinery protection. For existing 3300 XL installations, the 330104 remains the correct replacement probe and is expected to remain available through at least 2035 based on current OEM support commitments.

Key architectural parameters that define 330104 compatibility:

• Tip diameter: 8mm
• Nominal gap voltage: -10.0 VDC (at 1.0mm gap, standard calibration)
• Scale factor: 7.87 V/mm (200 mV/mil)
• Operating temperature range: -35°C to +177°C (probe body)
• Supply voltage: -24 VDC nominal
• Output: -1 VDC to -21 VDC (linear range)
• Connector: Standard Bently Nevada 2-pin MIL-spec

330104 Full Catalog & Functionalities (SKU List)

The 330104 part number is structured as follows: 330104-[tip length]-[cable length]-[connector type]-[temperature rating]-[housing material]. The following SKUs represent the most commonly specified and stocked configurations across global MRO and OEM applications.

Proximity Probes — Standard Temperature (to +177°C)

• 330104-00-06-05-02-00: 8mm probe, 6-inch rigid extension, standard temp, bare lead termination, carbon steel housing — general-purpose radial vibration measurement.
• 330104-00-06-05-02-05: 8mm probe, 6-inch rigid extension, standard temp, armored cable, stainless steel housing — corrosive environment variant.
• 330104-00-10-05-02-00: 8mm probe, 10-inch rigid extension, standard temp — extended reach for deep bearing housing installations.
• 330104-00-12-05-01-05: 8mm probe, 12-inch rigid extension, standard temp, stainless housing — common OEM turbine package specification.
• 330104-04-12-05-01-05: 8mm probe, 4-meter integral cable, 12-inch rigid section, standard temp, stainless — widely used in steam turbine radial bearing measurement.
• 330104-08-12-05-01-05: 8mm probe, 8-meter integral cable, 12-inch rigid section, standard temp — long-cable variant for remote proximitor mounting.
• 330104-00-06-10-02-00: 8mm probe, 6-inch extension, high-temperature rating (to +260°C) — gas turbine hot-section applications.
• 330104-00-10-10-02-00: 8mm probe, 10-inch extension, high-temperature — axial position measurement in high-temperature zones.

Proximity Probes — High Temperature (to +260°C)

• 330104-00-06-10-05-05: 8mm probe, 6-inch extension, +260°C rating, stainless housing — gas turbine compressor section.
• 330104-00-12-10-05-05: 8mm probe, 12-inch extension, +260°C rating, stainless — standard high-temp OEM spec for industrial gas turbines.
• 330104-04-12-10-05-05: 8mm probe, 4-meter integral cable, high-temp — combined cable/probe for high-temp remote mounting.

Extension Cables (Matched System Components)

• 330130-080-00-00: 8-meter armored extension cable, standard temperature — pairs with 330104 probes for standard proximitor mounting distance.
• 330130-045-00-00: 4.5-meter armored extension cable — short-run installations where proximitor is mounted close to bearing housing.
• 330130-100-00-00: 10-meter armored extension cable — extended-run installations, offshore platform applications.

Proximitor / Oscillator-Demodulator (System Completion)

• 330180-X1-05: 3300 XL 8mm proximitor, standard temperature, DIN rail mount — the standard signal conditioning module for all 330104 probe configurations.
• 330180-X1-10: 3300 XL 8mm proximitor, high-temperature cable compatible — required when pairing with high-temp 330104 variants.

Sourcing Hard-to-Find & Obsolete 330104 Parts

For plants operating legacy 3300 (non-XL) installations, DriveKNMS also stocks the predecessor 330100 and 330105 series probes, as well as the 7200 series components, enabling like-for-like replacement without system reconfiguration.

Quality Control for the 330104 Range

The 330104 proximity probe is a precision analog sensor. Its performance is defined by the linearity of the eddy-current response curve across the specified gap range (typically 0.25mm to 2.25mm). DriveKNMS applies the following test protocol to all 330104 units prior to dispatch: