135489-01 high-performance proximity probe extension cable

BENTLY 135489-01 is a high-performance proximity probe extension cable developed by Bently Nevada, specifically engineered for eddy current proximity probes in the 3500 Series and 3300 Series Machinery Protection Systems. As a critical accessory for precision monitoring of rotating machinery (e.g., turbines, generators, compressors), it serves as a reliable "signal bridge" between proximity probes and signal conditioners/monitor modules, ensuring unattenuated, interference-free transmission of vibration, position, and speed signals—key to avoiding false alarms or missed fault detections in critical industrial equipment. The detailed information is as follows:

1. Basic Overview

Category	Details
Product Type	Eddy current proximity probe extension cable (for precision machinery monitoring)
Part Number	135489-01
Cable Structure	Shielded twisted-pair (STP) – optimized for low-noise signal transmission
Standard Length	10 meters (custom lengths, such as 5m or 15m, available via special order for on-site layout needs)
Weight	Approximately 0.7 kg (varies slightly with cable length)
Connector Configuration	Male bayonet connector (probe end) + Female bayonet connector (monitor/conditioner end) – fully compatible with Bently Nevada’s probe and module interfaces
Operating Temperature Range	-40°C to +90°C – suitable for extreme industrial environments (e.g., turbine enclosures, high-temperature compressor rooms)
Ingress Protection (IP Rating)	IP67 (when connectors are fully mated) – dust-tight and water-resistant, ideal for humid or dusty sites (e.g., offshore platforms, power plant boiler rooms)

2. Core Technical Specifications

2.1 Electrical Performance (Critical for Signal Integrity)

Characteristic Impedance: 50 ohms ±8% (at 1 MHz) – precisely matched to Bently Nevada’s eddy current proximity probes (e.g., 330180 series) and 3500/20 monitor modules. This impedance matching eliminates signal reflection and distortion, ensuring accurate transmission of high-frequency vibration (up to 1 kHz) and shaft position signals.
Signal Attenuation: ≤0.3 dB/m (at 200 kHz) – ultra-low attenuation even over the 10-meter standard length. This ensures that weak eddy current signals (typical of proximity probes) remain stable, avoiding measurement errors in precision monitoring (e.g., shaft eccentricity, thrust position).
Shielding Effectiveness: ≥90 dB (from 100 kHz to 1 GHz) – dual-layer shielding (tinned copper braid + aluminum foil) blocks external electromagnetic interference (EMI) from power cables, motor drives, and industrial controllers, as well as radio frequency interference (RFI) from communication equipment.
Insulation Resistance: ≥200 MΩ (at 500 V DC) – high insulation prevents leakage current, which could damage sensitive probe electronics or cause false readings in low-level signal detection.
Capacitance: ≤100 pF/m (between conductors) – low capacitance minimizes signal delay, critical for real-time monitoring of fast-changing parameters (e.g., transient vibration during machine startup).

2.2 Mechanical & Environmental Durability

Cable Jacket Material: Fluorinated ethylene propylene (FEP) – offers superior resistance to high temperatures, industrial oils, coolants, and chemical vapors (compliant with ASTM D2671 for chemical resistance). Unlike PVC jackets, FEP does not degrade in high-heat environments (e.g., near turbine exhausts).
Flexibility: Minimum bend radius – 8× cable diameter (static) / 12× cable diameter (dynamic) – allows easy routing through tight spaces (e.g., between machinery frames or inside control cabinets) without damaging the shielding or conductors.
Abrasion Resistance: Jacket hardness ≥70 Shore D – withstands mechanical wear from contact with metal surfaces or cable trays, extending service life in high-vibration areas (e.g., compressor skids).
Corrosion Resistance: Tinned copper conductors and nickel-plated connectors – resist oxidation and corrosion in humid or salt-laden environments (e.g., coastal power plants, offshore wind turbines).

3. Functional Role & Compatibility

3.1 Key Function in Machinery Protection Systems

Bently Nevada proximity probes (e.g., 330180-50-05, 330190-080-00-05) measure shaft radial vibration, axial thrust position, and rotor eccentricity—critical parameters for preventing catastrophic failures in rotating machinery. The 135489-01 cable addresses the common challenge of "probe-to-monitor distance":

It extends the probe’s signal reach from the machinery (where probes are mounted) to the control cabinet (where monitor modules are installed), eliminating the need to place sensitive electronics near harsh machine environments.
It preserves signal integrity, ensuring that the monitor module receives accurate data to compare against alarm thresholds (e.g., dangerous vibration levels that trigger machine shutdown).

3.2 Compatibility

This cable is fully integrated with Bently Nevada’s core monitoring ecosystem, including:

Proximity Probes: 3300 series (3300/10, 3300/30), 330180 series (330180-50-05, 330180-80-00), and 330190 series eddy current probes.
Signal Conditioners/Monitor Modules: 3500/20 (position/vibration monitor), 3500/22 (speed/tachometer monitor), 3300/20 signal conditioner, and 3500/42 (dual-channel vibration monitor).
Machinery Types: Steam turbines, gas turbines, hydro generators, centrifugal compressors, reciprocating pumps, and gearboxes in power generation, oil & gas, petrochemical, and marine industries.

4. Product Advantages (vs. Generic Cables)

Advantage	BENTLY 135489-01	Generic Extension Cables
Signal Integrity	Impedance-matched (50Ω) to Bently probes/modules; ultra-low attenuation.	No impedance matching; high attenuation causes signal distortion.
Environmental Resistance	FEP jacket, IP67 rating, -40°C to +90°C operating range.	PVC jacket; limited to -20°C to +60°C; no IP protection.
Interference Shielding	Dual-layer shielding (≥90 dB effectiveness) blocks EMI/RFI.	Single-layer shielding (≤60 dB effectiveness); prone to interference.
Reliability	Factory-tested for compatibility with Bently systems; 5-year typical service life.	No system compatibility testing; frequent failures in harsh industrial environments.
Installation	Pre-terminated bayonet connectors (plug-and-play); no on-site crimping/soldering.	Requires manual termination; risk of wiring errors that damage probes/modules.

5. Typical Application Scenarios

Power Generation: Connecting 330180 proximity probes on a steam turbine’s high-pressure rotor to a 3500/20 monitor in the control room (10-meter distance), ensuring accurate vibration monitoring during turbine load changes.
Oil & Gas: Used in offshore drilling platforms to extend signals from 330190 probes on a gas compressor to a 3500 system cabinet, withstanding salt spray, humidity, and high temperatures.
Petrochemical Plants: Installed in a refinery’s catalytic cracker unit, where the FEP jacket resists exposure to hydrocarbon vapors and high temperatures (up to 85°C) near process equipment.
Marine Engineering: Connecting probes on a ship’s main propulsion turbine to a 3300/20 conditioner in the engine control room, withstanding constant vibration and oil mist.

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