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Home > Electrical & Electronics > Electrical Control System > BENTLY NEVADA 330780-90-05 Proximity Probe

BENTLY NEVADA 330780-90-05 Proximity Probe

BENTLY NEVADA 330780-90-05 Proximity Probe photo-1

Negotiable MOQ: 1 Piece (Price negotiable depending on order volume and customization)

Key Specifications

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Material:

Other, Global universal model

Condition:

Other, Global universal model

Task:

Other, Global universal model

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Guizhou Yuanmiao Automation Equipment Co., Ltd.

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Port of Shipment:

guizhou

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Delivery time depends on order quantity.

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Material Other, Global universal model

Condition Other, Global universal model

Task Other, Global universal model

Mathematical Model Other, Global universal model

Signal Other, Global universal model

Customized Non-Customized

Structure Other, Global universal model

Operating Temperature -40℃~+121℃

Relative Humidity 5% - 95% (non-condensing)

Storage Temperature -55℃~+125℃

Dimensions 100mm×160mm×50mm

I. Overview

The BENTLY NEVADA 330780-90-05 is a high-precision eddy current proximity probe assembly belonging to the 3300 XL series. Specifically designed for static position monitoring and dynamic vibration measurement of rotating machinery, it serves as a core sensing unit in industrial equipment condition monitoring systems. Its primary function is to convert the distance change between the probe and rotating components (such as rotors and shaft sleeves) into a linear voltage signal through the eddy current effect. This provides real-time, reliable displacement and vibration data for equipment health assessment, fault early warning, and safety interlocking, making it widely applicable to critical rotating equipment like steam turbines, generators, centrifugal compressors, and pump sets.

As an upgraded model of BENTLY NEVADA's classic monitoring products, the 330780-90-05 integrates mature eddy current sensing technology with a modular design concept: the complete assembly includes a probe, an extension cable, and a proximitor®. It supports seamless integration with the 3300 XL series monitoring framework and is also compatible with mainstream DCS/PLC systems. Compared with general-purpose proximity sensors, it has undergone specialized optimizations in measurement accuracy, environmental adaptability, and anti-interference capability. It is particularly suitable for harsh working conditions with extremely high monitoring reliability requirements (such as high-temperature, high-vibration, and strong electromagnetic interference environments) in industries like power generation, petrochemicals, and metallurgy.

II. Technical Specifications

(1) Core Sensing Parameters

Parameter Category	Specific Specifications
Sensing Principle	Eddy current effect; distance measurement realized through electromagnetic induction between metal conductors and the probe coil
Probe Specification	11mm diameter probe, with 316L stainless steel housing, M12×1 thread design (unarmored), suitable for narrow installation spaces
Measurement Range (Linear Range)	0~5mm (distance between probe and target), linear output voltage range: -2V~-10V DC (corresponding to 0~5mm distance change)
Measurement Accuracy	Linear error ≤ ±0.5% F.S. (Full Scale), resolution ≤ 1μm, ensuring accurate capture of tiny displacement changes
Target Requirements	Compatible with ferromagnetic/non-ferromagnetic metals (e.g., steel, aluminum, copper); target surface roughness ≤ Ra 1.6μm; minimum target diameter ≥ 25mm
Temperature Coefficient	≤ 0.01% F.S./℃ (-40℃~+70℃), reducing the impact of temperature changes on measurement accuracy

(2) Electrical and Output Parameters

Power Supply: 24V DC±10% for the proximitor, power consumption ≤ 3W (under full load)
Output Signal:

Analog Voltage Output: -2V~-10V DC (linearly corresponding to 0~5mm distance), output impedance ≤ 100Ω
Signal Bandwidth: 0~10kHz, supporting the collection of dynamic vibration signals (e.g., high-frequency vibrations caused by rotor unbalance or misalignment)

Calibration Characteristics: Supports on-site offline calibration (special calibration tools required); recommended calibration cycle is 24 months; after calibration, the linear error can be restored to within ±0.3% F.S.

(3) Environmental and Protection Parameters

Operating Temperature Range:

Probe: -40℃~+121℃ (high-temperature resistant design, suitable for high-temperature environments near steam turbine bearings)
Proximitor: -40℃~+70℃
Extension Cable: -40℃~+85℃

Storage Temperature Range: -55℃~+125℃, adapting to long-distance transportation and extreme storage environments
Protection Rating:

Probe: IP65 (dustproof and water-jet resistant), can be directly installed outside equipment bearing housings (dusty/humid environments)
Proximitor: IP40 (front panel), suitable for installation inside control cabinets

Vibration Resistance:

Probe: 10g acceleration (10Hz~2000Hz), compliant with IEC 60068-2-6 standard
Proximitor: 5g acceleration (10Hz~2000Hz), resisting the impact of control cabinet vibration

Electromagnetic Interference (EMI) Resistance:

Common-mode interference rejection ≥ 80dB (250Vpp, 50Hz~60Hz)
Differential-mode interference rejection ≥ 60dB (20Vpp, 50Hz~60Hz)
Compliant with EN 61000-6-2 EMC standard for industrial environments

(4) Physical and Connection Parameters

Assembly Dimensions:

Probe: Length 65mm (excluding cable), diameter 11mm
Proximitor: 100mm×160mm×50mm (L×W×H), designed for 1U height installation in 19-inch cabinets
Extension Cable: Standard length 5m (3m/10m customizable), cable diameter 6mm, shielding coverage ≥ 90%

Weight:

Probe: Approximately 80g
Proximitor: Approximately 0.5kg
Complete Assembly (including 5m cable): Approximately 1.2kg

Connection Interface:

Probe & Extension Cable: M12 waterproof connector (plugging/unplugging lifespan ≥ 500 cycles)
Extension Cable & Proximitor: Terminal block connection (Phoenix industrial terminals)

Mean Time Between Failures (MTBF): ≥ 1,200,000 hours (compliant with MIL-HDBK-217 standard, at 25℃)

III. Functional Features

(1) High-Precision Linear Measurement and Wide Compatibility

The 330780-90-05 adopts a customized eddy current coil design and low-temperature-drift signal conditioning circuit to ensure measurement accuracy and target compatibility:

The probe coil is wound with multi-strand enameled wire, combined with an optimized magnetic core design. It achieves uniform voltage output of -2V~-10V within the 0~5mm linear range, with a linear error ≤ ±0.5% F.S. For example, when the distance between the probe and the rotor changes from 1mm to 3mm, the output voltage linearly changes from -4V to -8V without non-linear inflection points, meeting the high-precision measurement requirements for static positions (e.g., shaft displacement) and dynamic vibrations (e.g., radial vibration).
It supports the measurement of ferromagnetic (e.g., 45# steel rotors) and non-ferromagnetic (e.g., aluminum alloy impellers) targets. The adaptation mode can be switched via the "material compensation" DIP switch inside the proximitor, eliminating the need to replace the probe to meet the monitoring needs of different equipment.
With a temperature coefficient of ≤ 0.01% F.S./℃, the measurement deviation caused by temperature changes within the wide temperature range of -40℃~+121℃ is ≤ 0.05mm (within the 5mm range), avoiding monitoring errors due to equipment operation heating. For instance, in the monitoring of steam turbine bearings in a thermal power plant, when the bearing temperature rises from 30℃ to 80℃, the probe measurement deviation is only 0.03mm, far lower than the 0.1mm deviation threshold of traditional sensors.

(2) Strong Environmental Adaptability and Anti-Interference Design

Targeting harsh working conditions in industrial sites, the 330780-90-05 undergoes full-link protection optimization from material and structure to circuit:

The probe features a 316L stainless steel housing and high-temperature sealant, with an IP65 protection rating. It can be directly installed outside the equipment bearing housing to resist dust, oil pollution, and slight water splashing. In the monitoring of rolling mill bearings in a metallurgical plant, even when the environmental dust concentration reaches 10mg/m³, the probe can still work stably for a long time without signal drift.
The extension cable adopts a double-layer shielding design (inner aluminum foil + outer braided mesh) with a shielding effectiveness of ≥ 40dB, which can suppress radiation interference from frequency converters and high-voltage motors. Meanwhile, the cable sheath is made of oil-resistant PVC material, with a temperature range of -40℃~+85℃, suitable for oil-gas-rich environments in petrochemical plants.
The proximitor is equipped with an independent power isolation circuit (isolation voltage ≥ 2500Vrms) and a common-mode rejection circuit inside, which completely isolates the input power from the signal circuit, avoiding signal interference caused by power grid fluctuations or equipment grounding faults. In the strong electromagnetic environment near power plant generators (magnetic field strength 100mT), the output signal ripple is ≤ 5mV, far lower than the 20mV ripple of traditional sensors.

(3) Modular Integration and Convenient Maintenance

The assembly adopts a modular split design, balancing the flexibility of system integration and the convenience of operation and maintenance:

The probe, extension cable, and proximitor are split independently. Cables of different lengths (3m/5m/10m) can be selected according to the equipment installation distance, eliminating the need for on-site cable cutting and reducing installation errors. The proximitor is compatible with 19-inch standard cabinets and can be integrated with 3300 XL series vibration monitoring modules and temperature modules to achieve centralized multi-parameter monitoring.
Supports hot-swap maintenance: When the monitoring system is powered on, the M12 connector between the probe and the extension cable can be disconnected to replace the probe. The connection between the proximitor and the system bus does not require power-off. During the replacement process, only the monitoring of this channel is suspended, without affecting the normal operation of other channels, meeting the "non-stop maintenance" requirement.
The proximitor panel is equipped with LED status indicators (power/fault/normal) for intuitive judgment of the assembly's working status: a steady green light indicates normal operation, a flashing red light indicates probe open/short circuit, and a flashing yellow light indicates signal over-range. Maintenance personnel can quickly locate basic faults without connecting to diagnostic software.

(4) Dynamic Vibration Capture and Fault Early Warning Adaptation

The 330780-90-05 features wide signal bandwidth and fast response capability, making it suitable for dynamic fault monitoring of rotating machinery:

With a signal bandwidth of 0~10kHz, it supports the collection of vibration signals of typical faults such as rotor unbalance (1× speed frequency), misalignment (2× speed frequency), and bearing wear (0.5× speed frequency). Combined with backend monitoring systems (e.g., BENTLY System 1), it can realize fault feature extraction and early warning.
The step response time is ≤ 10μs. When the rotor experiences instantaneous impact vibration (e.g., sudden vibration rise caused by surge), the probe can quickly capture signal changes and output without delay. For example, under the surge condition of a centrifugal compressor, when the vibration suddenly rises from 0.2mm to 0.8mm, the assembly can complete signal response within 8μs, providing fast data support for emergency shutdown interlocking.
The output signal can be directly connected to the analog input module of the DCS/PLC system without additional signal conversion equipment. It also supports linkage with the BENTLY 3300 XL framework to realize the integration of "measurement-analysis-alarm". The alarm threshold can be customized through framework software (e.g., shaft displacement exceeding 4mm triggers a danger alarm).

Product Tags: 330780-90-05