📦 Product Overview

• 3500/42-04-02 – Bently Nevada Proximitor Seismic Monitor
• Accepts 1 to 4 channels of proximity, velocity, or acceleration signals
• Comes with internal barriers & terminations (I/O Type 04)
• Hazardous Area Approval: 02 – ATEX / IECEx / CSA (Class 1, Zone 2)
• Made in USA. 12-month warranty included
• Fast dispatch: 12-24 hours via FedEx, UPS, or DHL

🔧 Technical Data – Tree View

• Power & Inputs
  • Power use: 7.7 watts (typical)
  • Input impedance: 10 kΩ (standard I/O)
  • Signal: Proximitor, velocity, or acceleration
• Sensitivity options
  • Radial / Thrust / Eccentricity: 3.94 or 7.87 mV/µm
  • Differential Expansion: 0.394 or 0.787 mV/µm
  • Acceleration: 10 mV/(m/s²) = 100 mV/g
  • Velocity: 20, 5.8, or 4 mV/(mm/s) pk
• Outputs & LEDs
  • OK LED: module works fine
  • TX/RX LED: talking to other modules
  • Bypass LED: bypass mode active
  • Recorder output: +4 to +20 mA, load 0-600 Ω
  • Buffered transducer output: coaxial, short-circuit proof
• Accuracy (typical)
  • Direct & Gap: ±0.33% of full scale
  • Thrust & Differential: ±0.33%
  • Acceleration: ±0.33%
  • Velocity: ±0.33% (add ±11% with external barrier)
• Frequency response
  • Radial direct: -3 dB at 4-4000 Hz or 1-600 Hz
  • Gap filter: -3 dB at 0.09 Hz
  • Acceleration: 4-pole high/low pass filters
  • Velocity RMS: 10 to 5500 Hz (-3 dB)
• Physical & environment
  • Size: 241.3 x 24.4 x 241.8 mm (HxWxD)
  • Weight: 0.91 kg (2.0 lb)
  • Specs at +25°C. Temp error: ±0.7% max

✅ Certification & Compatibility

• Approval 02: ATEX, IECEx, CSA (Class 1, Zone 2)
• Works with 3500 rack systems
• Supports proximity probes, Velomitor, and accelerometers
• Option B02 available only with A04, A05, A06, A09

🔌 Installation & Maintenance

• Hot-swappable – no rack shutdown needed
• Front coaxial jacks for easy signal check
• LEDs show status: OK, TX/RX, Bypass
• No special tools required

📦 What‘s in the box

• 1 x 3500/42-04-02 monitor module (main board)
• No cables, no sensors
• 12-month warranty from ship date

🎯 Expert Review

• “We use this monitor on Zone 2 turbines. The ±0.33% accuracy gives us reliable data. The internal barriers save wiring time.” – Senior Instrument Engineer, offshore platform.

💡 Manager’s Insight

• “Low 7.7W power keeps our racks cool. 12-24 hour dispatch and FedEx delivery cut project delays. The 12-month warranty lowers risk.” – Reliability Manager, power plant.

🏭 Applicable Devices & Scenarios

• Machines: gas turbines, steam turbines, compressors, large pumps
• Industries: oil & gas, power generation, chemical plants
• Zones: Class 1, Zone 2 hazardous areas (ATEX/IECEx/CSA)
• Perfect for shaft absolute vibration, radial/thrust monitoring

❓ 5 Professional FAQs

• Can this 3500/42-04-02 work with Velomitor sensors in Zone 2?Yes. Use Velocity mode. Remember: external barrier adds ±11% error under radiated immunity.
• What happens if I short the recorder output wires?No damage. The monitor keeps working fine.
• My machine speed is 50,000 cpm. Can I use the Not 1X filter?Yes but error is ±8.5% above 30,000 cpm. For better accuracy, use 1X vector filter.
• How do I choose between 100 mV/mil and 200 mV/mil?Pick 200 mV/mil for small vibrations (better detail). Pick 100 mV/mil for large movements to avoid signal clipping.
• Is the 12-month warranty valid internationally?Yes. Warranty covers defects. Shipping via FedEx/UPS/DHL is 12-24 hours after order.

🛒 Buying Guide – Quick Tips

• Need Zone 2 approval? 3500/42-04-02 is correct.
• For Zone 0 or 1, choose a different approval code.
• Check rack power: each module uses 7.7W.
• Want factory calibration cert? Request before shipping.
• Use FedEx, UPS, or DHL for fast global delivery.