Bently Nevada 330907-A05-B30C05-D02-ECN 3300 XL 25 mm Proximitor Sensor

Bently Nevada 330907-A05-B30C05-D02-ECN (3300 NSv reverse-mounted eddy current probe)
330907-A05-B30C05-D02-ECN is a reverse-mounted eddy current probe of the 3300 NSv series from Baker Hughes (formerly Bently Nevada), used for shaft vibration, shaft displacement, differential expansion, and rotational speed measurement. It is characterized by its compact design, high temperature resistance, reverse installation, and is suitable for heavy rotating machinery such as steam turbines and compressors.

I. Model Code Analysis (330907-A05-B30C05-D02-ECN)
This is an extended customized model of 330907. The standard short model is 330907-05-30-10-02-05:
330907: Basic model → 3300 NSv reverse-mounted probe, φ11mm, M10×1 thread
A05: Non-threaded section length of the probe 0.5 inches (12.7mm)
B30: Total length of the probe housing 3.0 inches (76.2mm)
C05: Built-in cable length 5m
D02: Connector → ClickLoc micro coaxial connector, standard cable
ECN: China explosion-proof certification (Ex d IIC T6) + Custom calibration (AISI 4140 steel)

 Core Technical Specifications (φ11mm reverse installation)
1. Measurement Performance
Linear range: 0.5 – 4.5mm (20 – 180 mils), range 4mm (twice the size of 8mm probe)
Sensitivity (ISF): 7.87V/mm (200mV/mil) ± 5%
Recommended clearance: -9VDC (approximately 1.5mm)
Frequency response: 0 – 10kHz (±3dB)
Accuracy: Linearity ≤ ±50μm, temperature stability ±10% (-52℃ to +177℃)
2. Physical and Installation
Installation method: Reverse installation (reverse mounting) – Installation from the inner side of the bearing box to the outside, with the probe facing outward
Thread: M10×1 metric thread (standard)
Probe diameter: φ11mm (large size of NSv series)
Probe length: 76.2mm (3.0 inches)
Built-in cable: 5m (can be equipped with extension cable, up to 9m)
Minimum target surface: φ25mm (flat), recommended shaft diameter ≥ 100mm
3. Environmental and Electrical
Operating temperature: -52℃ to +177℃ (standard), optional +218℃
Power supply: -17.5 to -26VDC (supplied by 3300 preamplifier or 3500/42M card)
Certifications: SIL2/3, CE, UL, CSA, ATEX, IECEx, CNEX (China explosion-proof)
3300 NSv vs 3300 XL (Core Differences)
3300 NSv (330907): φ11mm, 4mm range, mainly reverse installation, high temperature resistance, suitable for large shaft diameters
3300 XL (330105/06): φ8mm, 2mm range, forward or reverse installation, universal type
IV. System Composition and Accessories
Complete system: 330907 probe + 330930 extension cable + 330980 preamplifier
Accessories: 3500/42M (electrodynamic shear specific), 3500/40 (shaft vibration), 3500/45 (differential expansion)
Typical Applications
Power: Steam turbines, generators, boiler feed pumps (large shaft diameters, high-temperature scenarios preferred)
Petroleum: Centrifugal compressors, ethylene cracking gas compressors
Oil and Gas: Gas turbines, large conveyance pumps
Metallurgy: Large motors, sintering fans