Product Specification Document: Bently Nevada 330850-50-00

1. Product Overview

2. Basic Product Information

Manufacturer and Model Identity

• Manufacturer: Bently Nevada (Emerson Automation Solutions)

• Product Series: 3300 XL Proximity Transducer System

• Model Number: 330850-50-00

• Product Type: 25 mm Eddy Current Proximitor Sensor (Signal Conditioner)

• System Compatibility: 3300 XL 25 mm Probes (e.g., 330851 series); 3300/3500 Series Monitoring Modules

• Calibration Standard: Factory-calibrated for AISI 4140 ferromagnetic steel

• Country of Origin: United States

Electrical Ratings

• Power Supply: -17.5 V DC to -26 V DC (nominal -24 V DC)

• Power Consumption: ≤12 mA @ -24 V DC

• Output Signal: Linear voltage (-1.5 V DC to -11.5 V DC); sensitivity 7.87 V/mm (200 mV/mil)

• Measurement Principle: Eddy current induction (non-contact displacement)

• Frequency Response: DC (static) to 10 kHz (dynamic)

• System Length: 5.0 meters (16.4 ft) total (probe + extension cable)

Physical and Mechanical

• Enclosure Material: A380 aluminum alloy (lightweight, durable)

• Dimensions: 81.3 mm × 63.5 mm × 61 mm (W × H × D)

• Net Weight: ~0.255 kg (0.56 lb)

• Mounting: DIN-rail or panel mount (standard configuration)

• Terminals: SpringLoc tool-less terminal strips for fast, secure wiring

• Enclosure Rating: IP20 (indoor use; protected against finger contact)

Compliance and Certification

• Standards: API 670 (4th edition), ISO 10816, IEC 61000-6-2

• EMC: CE marked (enhanced RFI/EMI immunity for industrial noise)

• Environmental: RoHS compliant; conformal coating on internal PCB

• Certifications: cULus, ATEX/IECEx (optional for hazardous area installations)

3. Function and Product Positioning

Core Measurement Functions

• Differential Expansion  Monitoring: Measures axial displacement between turbine rotors and casings to prevent mechanical contact during thermal transients—critical for large steam/gas turbines.

• Shaft Vibration Monitoring: Captures dynamic radial vibration (amplitude, frequency, phase) in heavy rotating equipment, detecting imbalance, misalignment, bearing wear, or rubs.

• Static Shaft Position: Monitors steady-state shaft displacement, eccentricity, and thrust bearing clearance for operational safety and thermal growth analysis.

• Keyphasor Signal Processing: Generates once-per-revolution pulses for phase angle and speed calculation, supporting vibration analysis and overspeed protection.

Operational Features

• Wide Linear Range: Maintains linear output over 0.63–13.33 mm (25–525 mil) gap range, ideal for large shaft displacement and differential expansion measurements.

• High Sensitivity & Linearity: 7.87 V/mm sensitivity with ±0.5% full-scale linearity, ensuring precision in heavy machinery applications.

• Tool-Less Installation: SpringLoc terminals eliminate the need for special tools, reducing wiring time and improving field reliability.

• Self-Diagnostics: Detects probe/cable open/short circuits, power supply faults, and signal anomalies, outputting fault indicators to monitoring systems.

Product Positioning

• Large steam/gas turbine protection and condition monitoring

• Generator and heavy compressor vibration/position monitoring

• API 670-compliant machinery protection systems

• Predictive maintenance for critical high-power rotating equipment

4. Core Performance Parameters

Measurement Performance

• Probe Compatibility: 25 mm diameter eddy current probes (3300 XL series)

• Linear Gap Range: 0.63–13.33 mm (25–525 mil)

• Sensitivity: 7.87 V/mm (200 mV/mil) ±0.5%

• Linearity: ±0.5% full-scale (over linear range)

• Repeatability: ±0.1% full-scale

• Frequency Response: DC to 10 kHz (±3 dB)

• Target Material: Optimized for AISI 4140 carbon steel; non-ferrous targets require custom calibration

Environmental Limits

• Operating Temperature: -40°C to +70°C (-40°F to +158°F)

• Storage Temperature: -55°C to +100°C (-67°F to +212°F)

• Relative Humidity: 5%–95% RH (non-condensing)

• Vibration Resistance: 25 g (5 Hz–2 kHz); 50 g shock (11 ms half-sine)

• EMI Immunity: >60 dB attenuation (1 MHz–1 GHz), meeting IEC 61000-6-2

Reliability

• MTBF: >200,000 hours (25°C, full load)

• Warranty: 1 year (standard); extended warranties available

• Lifecycle Status: Active production (fully supported in new and legacy 3300/3500 systems)

5. General Matching Accessories

Installation and Mounting

• DIN-rail mounting adapter (standard accessory)

• Panel mounting hardware kit (screws, brackets)

• Probe/cable strain relief kit (high-vibration areas)

• Hazardous-area cable glands (ATEX/IECEx certified)

System Compatibility

• 3300 XL 25 mm Probes (e.g., 330851-02-00)

• 3300 XL 25 mm Extension Cables (e.g., 330852-05-00)

• 3500/42M, 3500/45, 3500/50 Monitoring Modules

• 4–20 mA signal converters (PLC/DCS integration)

Maintenance and Spares

• Replacement SpringLoc terminal blocks

• Probe/cable repair kit (PTFE insulation, stainless-steel braid)

• Conformal coating touch-up kit (PCB protection)

• Annual calibration verification certificate

Documentation and Software

• 330850-50-00 datasheet and installation manual

• Bently Nevada 3300 XL 25 mm system planning guide

• Proximity system calibration software (setup/verification)

• Factory test and calibration report (included with unit)

6. Applicable Equipment and Industry Fields

Primary Applications

• Power Generation: Large steam/gas turbines, generators, and heavy compressors in thermal power plants (fossil, nuclear) and combined-cycle facilities.

• Oil and Gas: Centrifugal compressors, turboexpanders, and large pumps in refineries, LNG plants, and offshore platforms.

• Petrochemical: Process compressors, reactors, and large rotating equipment requiring differential expansion and vibration monitoring.

Secondary Applications

• Heavy Industry: Steel mill rolling mills, large fans, and blowers for vibration and position control.

• Marine: Ship propulsion turbines and generators for condition monitoring and protection.

• Utilities: Water treatment large pumps and blowers for predictive maintenance.

Compatibility Notes

• 25 mm System Exclusive: Designed only for 3300 XL 25 mm probe systems; not compatible with 8 mm or 11 mm probe systems.

• Fixed System Length: Calibrated for 5.0-meter total system length (probe + extension cable); do not mix with different-length cables.

• Ferromagnetic Targets: Optimized for carbon steel (AISI 4140, 1045); non-ferrous targets (aluminum, copper) require factory recalibration.