Bentley 330100-90-00 Detailed Product Description

I. Product Overview

Bentley 330100-90-00 is an 8mm eddy current preamplifier (Proximitor Sensor) of the 3300 XL series from Bently Nevada under Baker Hughes, serving as the core signal conditioning unit of the rotating machinery condition monitoring system. It is strictly designed in accordance with API 670 standards. As a key component for non-contact measurement, it is paired with 8mm eddy current probes and extension cables for real-time monitoring of shaft vibration, axial displacement, shaft eccentricity, and keyway signals. It is widely used in online monitoring and safety protection of critical equipment such as steam turbines, gas turbines, compressors, and generators in the power, petrochemical, and metallurgical industries, suitable for ordinary non-explosion-proof industrial areas. The total cable length of the system is calibrated at 9.0 meters, without special certification configuration.

II. Model Decoding

330100: Basic model, representing the 3300 XL series standard preamplifier, specifically adapted for the 8mm eddy current probe system;

90: The total cable length of the system (probe + extension cable) is 9.0 meters, suitable for long-distance signal transmission scenarios;

00: Certification configuration code, without additional international certifications (such as UL, ATEX), only retaining the basic CE certification, different from the 05 version with multiple certifications.

III. Working Principle

It operates based on the eddy current measurement principle. The oscillator inside the preamplifier generates high-frequency alternating current, which is transmitted through the connecting cable to the internal coil of the probe. When the probe approaches the rotating metal shaft, the shaft surface induces eddy currents, which reverse and change the inductance and impedance values of the probe coil. The preamplifier precisely captures this impedance change, undergoes signal amplification, demodulation, and linearization processing, and outputs a linear negative voltage analog signal proportional to the gap (displacement) between the probe and the shaft, thereby achieving non-contact static gap (displacement) and dynamic vibration measurement. The measurement process is not affected by media such as oil, water vapor, and dust, and can operate stably in harsh industrial environments for a long time.

IV. Core Technical Parameters

(1) Electrical Parameters

Compatible probes: 330101, 330102, 330103, 330104 series 8mm eddy current proximity probes;

Sensitivity: 7.87 V/mm (200 mV/mil), high measurement accuracy;

Linear measurement range: 0.25mm - 2.3mm, effective range 2.0mm;

Output voltage: -1VDC to -17VDC; standard static installation gap of 1.27mm, output is -9VDC;

Frequency response: 0Hz - 10kHz, covering the vibration monitoring requirements of high-speed and low-speed rotating equipment;

Power supply: -24VDC (±10%), maximum power consumption ≤ 2W;

Output impedance: 50Ω, compatible with standard industrial signal acquisition interfaces;

Power supply stability: for every 1V change in input voltage, the output voltage changes < 2mV, strong anti-power supply fluctuation interference capability.

(2) Environmental and Mechanical Parameters

Preamplifier operating temperature: -40℃ to +85℃;

Probe operating temperature: -51℃ to +177℃, excellent high-temperature performance;

Storage temperature: -40℃ to +85℃;

Protection level: IP65, dustproof and resistant to water spray intrusion;

Shell material: engineering plastic combined with metal base, shock-resistant and corrosion-resistant;

Installation method: standard DIN rail installation, compatible with industrial control cabinets;

Size: approximately 110mm × 70mm × 20mm;

Weight: approximately 0.29kg, compact structure, convenient installation.

(3) Certification and Compliance Basic Certification: CE certification, meeting electromagnetic compatibility (EMC) requirements;

No explosion-proof certification: Only applicable to ordinary non-flammable and non-explosive industrial areas, and prohibited for use in dangerous explosion-proof scenarios;

No additional international certifications such as UL, ATEX, etc. (different from 330100-90-05).

V. Structural Design and Core Features

(1) Structural Design

Adopting a compact modular structure, it can be directly installed on the standard DIN rails of the control cabinet, with convenient disassembly and assembly. The equipment is equipped with dedicated coaxial signal interface (connecting the probe and the extension cable), power connection terminals and signal output terminals. The port layout is clear, facilitating on-site wiring and debugging. The system has been precisely calibrated at the factory for a total cable length of 9.0m, with high impedance matching and minimal signal loss over long distances, eliminating the need for on-site secondary calibration.

(2) Core Advantages

High precision and high stability: Low drift design, strong long-term operation consistency of measurement data, reducing drift errors;

Strong anti-interference ability: Built-in electromagnetic shielding structure, effectively resisting EMI/RFI interference generated by frequency converters and high-power motors, suitable for complex electromagnetic environments;

Long-distance transmission compatibility: Exclusive 9.0m cable length calibration, meeting the wiring requirements for large equipment across regions;

Full compatibility and interchangeability: Fully compatible with all 8mm probes and extension cables of the 3300 XL series, components can be directly interchanged, no additional matching calibration required, reducing spare parts management costs;

Industrial-grade reliability: IP65 protection level, sturdy structural design, capable of long-term stable operation in high-temperature, dusty, and vibrating harsh conditions, extending equipment service life;

Non-contact measurement: No mechanical wear, avoiding the loss issues of contact sensors, reducing maintenance frequency and costs.

VI. System Composition and Compatibility

(1) Complete System Composition

A complete measurement system consists of 330100-90-00 preamplifier, 3300 XL 8mm probe (330101/02/03/04 series), and 330130 series extension cable. The total cable length (probe + extension cable) must be strictly 9.0m; otherwise, it will affect measurement accuracy and is prohibited from being changed arbitrarily.

(2) Equipment Compatibility

Fully compatible with the 3300 and 3500 series monitoring racks, the output analog signal can be directly connected;

Can be connected to mainstream industrial control systems such as DCS, PLC, etc., to achieve real-time display, over-limit alarm, equipment safety interlock, etc.;

Compatible with common metal shaft materials such as AISI 4140 steel, no additional adaptation or adjustment required.

VII. Typical Application Scenarios

Power Industry: Vibration and displacement monitoring of main and auxiliary equipment such as steam turbines, gas turbines, generators, feed pumps in thermal power plants and nuclear power plants;

Petrochemical Industry: High-speed rotating machinery such as centrifugal compressors, process pumps, fans, etc., suitable for non-explosion-proof production areas;

Metallurgical Industry: State-of-the-art rotating equipment such as large drive motors, blast furnace fans, gearboxes, etc., for condition monitoring;

General Industry: Key rotating equipment in industries such as papermaking, cement, etc., for equipment fault early warning and preventive maintenance.

VIII. Installation and Maintenance Specifications

(1) Installation Requirements

Installation location: Fixed on the DIN rails of the control cabinet, away from heat sources, high-pressure components, and strong electromagnetic interference sources (such as frequency converters, transformers);

Wiring specification: Strictly distinguish power terminals, signal output terminals, and probe interfaces, secure wiring, tighten coaxial connectors, avoid poor contact; 

Gap adjustment: The static gap between the probe and the measured shaft is adjusted to 1.27mm, prohibiting direct contact between the probe and the shaft to prevent probe damage; Cable Management: The total length is strictly controlled at 9.0m. The cable bending radius should be no less than 5 times the cable diameter to avoid excessive bending that may damage the internal core wires.

(II) Daily Maintenance

Regular Calibration: Conduct an accuracy calibration once a year to ensure that the measurement performance meets the standards;

Routine Inspection: Check the tightness of connectors, the integrity of cables, and whether the environmental temperature is normal;

Cleaning and Maintenance: Regularly clean the dust on the surface of the preamplifier to ensure good heat dissipation and avoid overheating faults caused by dust accumulation;

Spare Parts Management: Use original Bently probes and extension cables. Non-original accessories are prone to cause measurement deviations or system failures.

IX. Usage Precautions

Prohibit Overheating Operation: The working temperature should be controlled within the range of -40℃ to +85℃ to avoid aging due to high temperature or failure due to low temperature;

Avoid Severe Impact: The equipment is shock-resistant but cannot withstand severe impacts or long-term intense vibrations. It is necessary to fix it firmly during installation;

Prohibit Use in Explosion-proof Areas: This model has no explosion-proof certification. It is strictly prohibited to use in flammable and explosive hazardous environments (such as oil and gas areas, chemical explosion-proof workshops);

Prohibit Unauthorized Modification: Do not privately change the cable length, replace non-original accessories, or disassemble the equipment. Otherwise, it will lead to measurement failure, equipment damage, and loss of warranty eligibility;

Power-off Operation: When connecting, repairing, or inspecting, the power must be cut off to prevent short circuits or electric shock accidents.