BENTLY NEVADA 330108-91-05 Proximity Probe

I. Overview

II. Technical Specifications

(1) Core Sensing Parameters

(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 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

• 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 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

• 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).