Bentley 330101-05-26-10-02-05 Electromagnetic Eddy Current Probe Detailed Description

I. Product Introduction

330101-05-26-10-02-05 is a 3300 XL 8mm standard non-armored eddy current probe of Bently Nevada under 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 is designed with a short non-threaded section + short housing + 1-meter cable, suitable for shallow holes, conventional installation spaces, and hazardous area working conditions. Based on the eddy current effect, it realizes non-contact high-precision measurement and is used for rotational machinery shaft vibration, axial displacement, phase angle, and speed monitoring. It complies with API 670 industry standards and has the characteristics of compact structure, precise measurement, strong anti-interference, and explosion-proof compatibility. It is widely used in hazardous environments of large-scale units in petrochemical, power, and metallurgical industries for condition monitoring.

II. Basic Information

Model: 330101-05-26-10-02-05

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: 05 represents the length of the non-threaded section is 0.5 inches; 26 represents the total length of the housing is 2.6 inches (short housing); 10 represents the length of the probe's built-in cable is 1 meter; 02 represents the micro ClickLoc coaxial connector, standard non-armored cable; 05 represents CSA/ATEX/IECEx explosion-proof certification

Structural Features: Stainless steel housing (AISI 303/304), the end of the probe is made of PPS high-temperature resistant material; non-armored flexible cable, 1-meter length, suitable for conventional distance laying; patented TipLoc forming process, the end is firmly bonded to the housing, resistant to vibration loosening, short rod design suitable for shallow hole installation

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

Certification: CE, UL, CSA, ATEX, IECEx explosion-proof certification, compatible with hazardous areas and electromagnetic compatibility specifications

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

Compatible Systems: 3300 XL full series preamplifiers, 3500/3300 TSI systems

III. Electrical Parameters

Sensitivity: 7.87V/mm (200mV/mil), linear error ≤ ±1%, full temperature range stability ≤ ±1.5%

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)

System Compatibility: Requires matching with 3300 XL preamplifiers, the total electrical length (probe cable + extension cable) must be consistent with the calibration length of the preamplifier

IV. Environmental and Mechanical Parameters

Environmental Parameters

Operating Temperature: Standard - 52℃ to + 177℃, suitable for industrial wide-temperature working conditions

Storage Temperature: -52℃ to + 260℃

Relative Humidity: 5%–95% (no condensation) Anti-interference capability: Complies with CE EMI/RFI standards, capable of withstanding strong electromagnetic interference from inverter and motor

Explosion-proof rating: CSA/ATEX/IECEx certified, suitable for Zone 0/1/2 hazardous areas

Mechanical parameters

Length of non-threaded section: 0.5 inches (suitable for shallow holes and conventional installation spaces)

Total length of the housing: 2.6 inches (short housing, compact structure, suitable for narrow installation spaces)

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

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

Weight: Approximately 0.1kg, easy to install, suitable for lightweight requirements

VII. 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, 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, with nanometer-level measurement accuracy, no mechanical wear.

2. Short light rod short housing suitable for shallow hole installation

0.5-inch non-threaded section + 2.6-inch total housing length, specially designed for shallow holes and narrow installation spaces, compact structure without occupying extra space; the stainless steel housing has high strength, anti-vibration, and anti-deformation, the short light rod design ensures coaxiality during installation, no loosening during long-term operation, suitable for surface or shallow hole measurement points on equipment installation.

3. 1-meter standard cable suitable for conventional laying

1-meter non-armored flexible cable, suitable for the medium-distance connection scenario between the probe and the preamplifier / extension cable, balancing wiring flexibility and signal stability; the flexible material facilitates bending and laying in narrow spaces, reducing on-site cable redundancy and interference, not suitable for arbitrary cutting, maintaining the original factory length to ensure impedance matching.

4. Explosion-proof suitable for hazardous area conditions

Complies with CSA/ATEX/IECEx explosion-proof certification, suitable for flammable and explosive hazardous environments such as petrochemicals and natural gas, meeting safety requirements for Zone 0/1/2 areas, the sealed structure design prevents the invasion of flammable and explosive gases, ensuring stable operation in hazardous environments for a long time.

5. Wide temperature stability and fault diagnosis

Built-in high-temperature coils and insulating materials, combined with the system's automatic temperature compensation circuit, maintains measurement stability within the -52℃ to +177℃ wide temperature range; combined with the preamplifier to achieve line fault self-check, identifying probe breakage, short circuit, cable damage and other issues, outputting fault signals for alarm, compatible with 3500/3300 TSI systems, PLC, DCS, supports real-time data collection and over-limit alarm.

Six. 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, axial displacement, phase angle and rotational speed.

Seven. 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 measurement errors caused by inclination; when installing the short light rod, ensure the cleanliness of the hole position to prevent debris from affecting measurement accuracy. Gap setting: It is recommended to set at the midpoint of the linear range (approximately 1.27mm), corresponding to a -9VDC output from the preamplifier, to achieve the best linearity and stability.

Thread installation: Insert a 3/8-24 UNF thread into the shallow hole base, with the torque controlled at 1.1–1.4N・m. Avoid over-tightening to damage the thread or crush the cable.

Cable laying: The 1-meter non-armored cable should have a bending radius of ≥3 times the cable diameter to avoid sharp-angle bending; separate the cable from the power cable for wiring, and protect it with a conduit to prevent mechanical damage, and keep it away from high-temperature heat sources and corrosive media.

Joint connection: Align the micro ClickLoc joint with the slot and insert it, and it will lock when you hear a "click" sound. Ensure that the connection part is dust-proof and collision-resistant, with stable signal transmission. Regularly check the tightness of the joint to prevent loosening.

VIII. Typical Application Scenarios

Petrochemical industry: Vibration and axial displacement monitoring of centrifugal compressors and gas turbines in flammable and explosive areas, suitable for hazardous environments, ensuring continuous production and predicting shaft system faults.

Power industry: Axial vibration and key phase monitoring of shallow holes in steam turbine generators, suitable for narrow installation spaces, preventing rotor friction and bearing wear.

Metallurgical industry: Vibration and displacement monitoring of shallow rotating components of blast furnaces and large transmission motors, avoiding equipment overload damage, suitable for harsh industrial conditions.

Natural gas industry: Speed and eccentricity measurement of large rotating equipment in hazardous areas, providing data for dynamic balance correction and fault diagnosis, in line with explosion-proof safety standards.

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 in hazardous environments.

IX. Product Advantages

Compact and adaptable: 0.5-inch short rod + 2.6-inch short housing, suitable for shallow holes and narrow installation spaces, with a compact structure that does not occupy space.

Explosion-proof certification: CSA/ATEX/IECEx explosion-proof certification, suitable for flammable and explosive hazardous areas, with a wider applicable scope.

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

Convenient connection: Micro ClickLoc joint can be plugged and unplugged without tools, ensuring reliable connection, simplifying on-site installation and maintenance.

High interchangeability: Components can be replaced on-site without secondary calibration, reducing spare part management costs, and compatible with the entire 3300 XL system.