Bently Nevada 330105-02-12-10-02-05 3300 XL 8mm reverse-mounted eddy current probe

Bently Nevada 330105-02-12-10-02-05 (3300 XL 8mm reverse-mounted eddy current probe)

330105-02-12-10-02-05 is a 3300 XL 8mm reverse-mounted eddy current probe from Baker Hughes (formerly Bently Nevada), used for non-contact shaft vibration / shaft displacement measurement. It is installed from the inner side of the bearing housing, suitable for heavy rotating machinery such as turbines and compressors, with SIL2/3 certification and high temperature and reliability. 

I. Model Code Analysis (330105-02-12-10-02-05)

330105: Base model of 3300 XL 8mm reverse installation probe

02: Probe length 2 inches (50.8mm)

12: Probe thread 3/8-24 UNF (reverse installation specific)

10: Built-in cable length 1.0m

02: Connector type Miniature ClickLoc coaxial connector

05: Certification CSA/ATEX/IECEx (explosion-proof + safety certification)

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Core Technical Specifications (8mm reverse installation)

1. Measurement Performance

Linear range: 0.25 – 2.3mm (10 – 90 mils), range 2mm

Sensitivity (ISF): 7.87V/mm (200mV/mil) ±5%

Output voltage: -1 to -17VDC (linear range), recommended gap -9VDC (approx. 1.27mm)

Frequency response: 0 – 10kHz (±3dB)

Accuracy: Linearity ≤ ±38μm, temperature stability ±10% (-35℃ to +177℃)

2. Physical and Installation

Installation method: Reverse installation (reverse installation) – Installation on the inner side of the bearing box, with the probe facing outward

Thread: 3/8-24 UNF (reverse installation standard)

Probe diameter: 8mm (standard)

Probe length: 50.8mm (2 inches)

Built-in cable: 1.0m, can be extended with additional cable (maximum 9m)

Minimum target surface: φ15.2mm (flat), shaft diameter recommended ≥76.2mm

3. Environmental and Electrical

Operating temperature: -51℃ to +177℃ (standard), optional high temperature +218℃

Power supply: -17.5 to -26VDC (supplied by preamplifier / 3500 card)

Certification: SIL2/3, CSA, ATEX, IECEx, CE, UL

Reverse Installation vs. Normal Installation (330105 vs 330106)

330105 (reverse installation): Inner side installation, probe facing outward; suitable for limited space in bearing boxes, unable to wire on the outer side; commonly used in steam turbines, generators

330106 (normal installation): Outer side installation, probe facing inward; conventional installation, convenient for maintenance; commonly used in compressors, fans, pumps

System Composition and Accessories

Complete system: 330105 probe + 3300 XL extension cable + 3300 XL preamplifier (or directly connected to 3500/42M card)

Accessories: 3500/40 (shaft vibration), 3500/42M (electro-涡流 specific)， 3500/25 (preamplifier interface)

Typical Applications

Power： Steam turbines， generators， boiler feed pumps (reverse installation preferred)

Chemical industry： Centrifugal compressors， screw compressors (normal installation / reverse installation as needed)

Oil and gas： Gas turbines， conveying pumps

Metallurgy： Large motors， fans