Bentley 330101-XX-XX-10-02-00 Eddy Current Probe Product Description

I. Product Overview

330101-XX-XX-10-02-00 is a 3300 XL 8mm standard type (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 combined with the same series extension cable and preamplifier to form a complete measurement chain. The product adopts a standard housing and non-armored flexible cable design, suitable for conventional industrial environments and standard installation spaces. It achieves non-contact high-precision measurement based on the eddy current effect and is used for rotational machinery's shaft vibration, axial displacement, phase angle, and speed monitoring. It complies with API 670 industry standards and features a simple structure, stable measurement, strong anti-interference, and high cost-effectiveness. It is widely used in large-scale unit condition monitoring in power, petrochemical, metallurgy, coal chemical, and other fields.

II. Basic Information

Model: 330101-XX-XX-10-02-00

Brand: Bently Nevada

Series: 3300 XL 8mm Eddy Current Sensor System

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

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

Model Code Meaning: The first two digits XX represent no exposed thread section (normally 00); the middle two digits XX represent the total length of the housing (such as 12 = 1.2 inches, 20 = 2.0 inches, 40 = 4.0 inches, etc.); 10 represents the probe's built-in cable length of 1 meter; 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 material; non-armored flexible cable, convenient for on-site laying and bending; using patented TipLoc forming process, the end is firmly bonded to the housing; the cable has a sufficient tensile strength and is suitable for conventional conditions

Connector Type: Micro ClickLoc coaxial connector, reliable connection, convenient plugging and unplugging

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 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), covering the full vibration frequency band of rotating machinery

Probe DC Resistance: 7.59Ω ± 0.50Ω (1 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 Overall length of the housing: Can be selected as 1.2 inches, 2.0 inches, 3.0 inches, 4.0 inches, etc. (defined by the middle two digits XX)

Cable specification: 1-meter standard non-armored flexible cable, resistant to oil and aging, suitable for conventional laying environments

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 0.5–2MHz high-frequency excitation signal from the preamplifier, 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 to convert it 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. Standard structure and stable reliability

Using a stainless steel housing and PPS heat-resistant end, suitable for conventional industrial conditions; non-armored cable has good flexibility, facilitating conduit installation and wiring; the patented TipLoc process strengthens the end connection, ensuring no signal drift during long-term operation, with an average downtime of over 7×24 hours, meeting the requirements for continuous monitoring.

3. 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 the working conditions, ensuring accurate long-term monitoring data.

4. Flexible adaptation and rapid installation

Multiple housing lengths are available (1.2–4.0 inches), suitable for different installation spaces; standard 3/8-24 UNF threads are compatible with universal installation bases; the micro ClickLoc connector can be quickly plugged and unplugged without tools, and the same specification probes, extenders, and preamplifiers can be interchanged on-site without secondary calibration, reducing maintenance downtime.

5. Fault diagnosis and system compatibility

Cooperating with the preamplifier to achieve line fault self-check, identifying probe breakage, short circuit, and cable damage issues, outputting fault signals for alarm; compatible with 3500/3300 TSI systems, PLCs, and DCSs, supporting real-time data acquisition, over-limit alarms, 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 eddy current-generated reverse magnetic field 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: Vertically installed on the radial or axial direction of the measured shaft, the end of the probe is parallel to the shaft surface, avoiding tilt causing measurement errors; the installation area should be away from strong magnetic fields and heating elements to reduce interference.

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

Thread installation: 3/8-24 UNF threads are screwed into the base, with torque controlled within 1.1–1.4N・m, avoiding over-tightening and damaging the threads or squeezing the cable.

Cable laying: Non-armored cables have a bending radius of ≥ 3 times the cable diameter, avoiding sharp-angle bending; separate wiring from power cables, conduit protection to prevent mechanical damage; the total length must strictly match the 1-meter specification, and cannot be cut随意. Connection method: The micro ClickLoc connector is inserted into the slot and aligned, and a "click" sound is heard to indicate locking. Ensure that the connection area is dust-proof and collision-resistant, and the signal transmission is stable.

VII. Typical application scenarios

Power industry: Monitoring of shaft vibration and axial displacement for steam turbine generators, feedwater pumps, induced draft fans, and exhaust fans to prevent rotor friction and bearing wear; suitable for conventional installation spaces and without strong mechanical collision conditions.

Petrochemical industry: State monitoring for centrifugal compressors, gas turbines, process pump sets, and mixing units to ensure continuous production and predict shaft system failures; preferred in dry and less corrosive ordinary areas.

Metallurgical industry: Monitoring of vibration and displacement for blast furnace fans, large transmission motors, and rotating components of rolling mills to avoid equipment overload damage.

Industrial drives: Phase angle, 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 rotating machinery.

VIII. Product advantages

Standard non-armored design: Multiple shell lengths are available for selection, suitable for conventional spaces; flexible cables are easy to lay, and the cost is high.

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

Convenient connector design: Micro ClickLoc connector is plug-and-play without tools, ensuring reliable connection and simplifying on-site maintenance.

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

Long life: Industrial-grade materials resistant to high temperatures and aging, tested under harsh conditions, supporting long-term stable operation.