Bentley 330101-49-80-05-02-00 Electromagnetic Eddy Current Probe Product Description

I. Product Overview

330101-49-80-05-02-00 is a 3300 XL 8mm standard non-armored eddy current probe under the Bently Nevada brand of Baker Hughes. It is the core sensing component of the 3300 XL sensor system and must be paired with the same series extension cable and preamplifier to form a complete measurement chain. The product features an ultra-long housing + ultra-short non-armored cable design, suitable for special deep-hole installation spaces and conventional mild industrial environments. It achieves non-contact high-precision measurement based on the eddy current effect and is used for monitoring the shaft vibration, axial displacement, phase angle, and rotational speed of rotating machinery. It complies with API 670 industry standards and has the characteristics of a simple structure, stable measurement, strong anti-interference, and suitability for deep installation. It is widely used in large-scale units in the power, petrochemical, and metallurgical industries for deep-hole measurement point status monitoring.

II. Basic Information

Model: 330101-49-80-05-02-00

Brand: Bently Nevada

Series: 3300 XL 8mm Eddy Current Sensor System

Type: Standard non-armored proximity eddy current probe (330101 is non-armored version, different from 330102 armored version)

Thread Specification: 3/8-24 UNF American fine thread

Model Code Meaning: 49 represents no exposed thread section; 80 represents the total length of the housing 8.0 inches (ultra-long housing, suitable for deep-hole installation); 05 represents the probe's built-in cable length 0.5 meters (ultra-short cable); 02 represents the micro ClickLoc coaxial connector, standard non-armored cable; 00 represents no special configuration

Structural Features: Stainless steel housing (AISI 303/304), the probe end is made of PPS high-temperature resistant material; non-armored flexible cable, only 0.5 meters in length, suitable for short-distance connection; patented TipLoc forming process, the end is firmly bonded to the housing, resistant to vibration loosening

Connector Type: Micro ClickLoc coaxial connector, reliable connection, convenient plug and unplug

Certification: CE, UL, compatible with industrial safety and electromagnetic compatibility standards (no explosion-proof certification)

Protection Grade: IP54 (probe body), suitable for dry, low dust, and non-corrosive working conditions

Compatible Systems: 3300 XL full series preamplifiers (such as 330100 series), 3500/3300 TSI systems

III. Electrical and Mechanical Parameters

Electrical Parameters

Sensitivity: 7.87V/mm (200mV/mil), linear error ≤ ±1%

Linear Range: 2.0mm (80mil), effective range 0.25mm–2.3mm

Output Signal: Cooperates with preamplifier to output -1VDC to -17VDC standard DC voltage

Frequency Response: 0–10kHz (+0/-3dB), covers the full vibration frequency band of rotating machinery

Probe DC Resistance: 7.59Ω ± 0.50Ω (0.5 meter cable)

Minimum Target Diameter: 8.9mm (0.35 inches), recommended shaft diameter ≥ 50.8mm (2 inches)

Environmental Parameters

Probe Working Temperature: Standard -52℃ to +177℃; High-temperature version can reach +218℃

Storage Temperature: -52℃ to +260℃

Relative Humidity: 5%–95% (no condensation)

Interference Resistance: Complies with CE EMI/RFI standards, tolerant to variable frequency drives, motors, etc. strong electromagnetic interference

Mechanical Parameters

Total Housing Length: 8.0 inches (ultra-long housing, suitable for deep-hole, long-distance installation holes) Cable specification: 0.5-meter standard non-armored flexible cable, resistant to oil and aging, suitable for short-distance installation.

Installation torque: Recommended 1.1–1.4N・m, avoid damage to the threads.

Cable bending radius: ≥3 times the cable diameter, avoid excessive bending to damage the core wire.

IV. Core functions

1. Non-contact precise measurement

Based on the eddy current effect, the end coil of the probe receives the high-frequency excitation signal of the preamplifier ranging from 0.5 to 2 MHz, generating an alternating magnetic field; when close to the metal shaft body, the surface of the shaft induces eddy currents, reversing the impedance of the coil, combined with the preamplifier, it is converted into a linear voltage signal, accurately reflecting the gap change between the probe and the shaft, achieving synchronous measurement of static displacement and dynamic vibration.

2. Ultra-long housing suitable for deep-hole installation

The 8.0-inch ultra-long housing is specially designed for deep-hole, long-distance installation scenarios, capable of extending into the deep measurement points inside the equipment, solving the installation problem that conventional short housing probes cannot reach; the stainless steel housing has high strength, is resistant to vibration and deformation, and does not loosen during long-term deep installation.

3. Ultra-short cable suitable for short-distance connection

The 0.5-meter ultra-short non-armored cable is suitable for scenarios where the probe and the preamplifier / extension cable are very close, reducing cable redundancy and avoiding on-site cable entanglement and interference; the flexible material is convenient for bending and laying in narrow spaces.

4. Wide temperature stability and temperature compensation

Built-in high-temperature coils and insulating materials, combined with the system's automatic temperature compensation circuit, in the -52℃ to +177℃ wide temperature range, the sensitivity stability is ≤±1.5%, capable of withstanding temperature fluctuations in working conditions, ensuring accurate long-term monitoring data.

5. Fault diagnosis and system compatibility

Cooperate with the preamplifier to achieve self-check of the line faults, identify probe breakage, short circuit, and cable damage, output fault signals for alarm; compatible with 3500/3300 TSI systems, PLC, DCS, support real-time data acquisition, over-limit alarm, and fault recording.

V. Working principle

The core of the probe is the end high-frequency coil, the preamplifier injects high-frequency alternating current into the coil, generating a stable alternating magnetic field; when the probe approaches the rotating metal shaft (conductor), the magnetic field induces a closed eddy current on the shaft surface, the reverse magnetic field generated by the eddy current will change the inductance and impedance of the probe coil; the probe transmits the impedance change signal to the preamplifier, the preamplifier converts it into a standard DC voltage signal at a fixed ratio of 7.87V/mm, the larger the gap, the closer the voltage is to -17V, the smaller the gap, the closer it is to -1V, thus accurately measuring dynamic parameters such as shaft vibration and axial displacement.

VI. Installation and wiring requirements

Installation position: Install vertically on the radial or axial direction of the measured shaft, the end of the probe is parallel to the shaft surface, avoid tilt causing measurement errors; when installing the ultra-long housing, ensure the coaxiality of the hole position to prevent the housing from bending and deforming.

Gap setting: It is recommended to set at the midpoint of the linear range (about 1.27mm), corresponding to -9VDC output from the preamplifier, to achieve the best linearity and stability.

Thread installation: Insert 3/8-24 UNF threads into the deep hole base, torque controlled within 1.1–1.4N・m, avoid over-tightening and damaging the threads or squeezing the short cable.

Cable laying: The 0.5-meter non-armored cable has a bending radius of ≥3 times the cable diameter, avoid sharp-angle bending; separate wiring from power cables, protected by conduit to prevent mechanical damage; do not cutly， maintain the original factory length.

Connector connection： Align the micro ClickLoc connector with the slot and insert it， hear the "click" sound to lock， ensure the connection part dust-proof and collision-proof， stable signal transmission.

VII. Typical application scenarios

Power industry： Deep-hole shaft vibration and axial displacement monitoring for steam turbine generator sets， suitable for internal deep measurement points of equipment， preventing rotor friction and bearing wear. Petrochemical industry: Vibration monitoring for deep-position bearings of centrifugal compressors and gas turbines to ensure continuous production and predict shaft system failures; Common areas with low corrosion are preferred.

Metallurgical industry: Vibration and displacement monitoring for deep-hole rotating components of blast furnace fans and large transmission motors to prevent equipment overload damage.

Industrial drives: Deep-position key phase, speed and eccentricity measurement for large motors and high-speed rotating equipment to provide data for dynamic balance correction and fault diagnosis.

TSI system support: As the front-end sensing component of the 3300 XL system, it is equipped with a preamplifier and monitoring card to build a safety protection and condition monitoring system for deep-hole measuring points of rotating machinery.

VIII. Product Advantages

Ultra-long housing design: 8.0-inch housing is suitable for deep-hole and long-distance installation scenarios, solving the blind area of conventional probe installation.

Ultra-short cable compatibility: 0.5-meter non-armored cable is compatible with short-distance connections, reducing on-site cable redundancy and interference.

High precision and stability: 7.87V/mm standard sensitivity, small linear error, strong wide-temperature stability, meeting API 670 high-precision requirements.

Convenient connector design: Micro ClickLoc connector is tool-free insertion and removal, reliable connection, simplifying on-site maintenance.

High interchangeability: Components can be replaced on-site without secondary calibration, reducing spare parts management costs.