3500/42-06-00 | Bently Nevada Proximitor Seismic Monitor

Reliable 4-channel monitor for proximity, velocity, and acceleration. Made in USA. Ideal for rotating machinery protection.

Product Overview

• Bently Nevada 3500 series monitor.
• Model: 3500/42-06-00 – Proximitor Seismic Monitor.
• I/O type: 06 = internal barriers + internal terminations + 4 x Velomitor.
• Channels 1-4 accept proximity (Prox) or accelerometer (Accel) inputs.
• No hazardous area approval (Option 00).
• Front panel LEDs: OK, TX/RX, Bypass for quick status checks.
• Each channel has short-circuit protected coaxial buffer output.

Technical Specifications

Inputs & Transducer Support

• Signal input: 1 to 4 channels (proximity / velocity / acceleration).
• Input impedance: 10 kΩ (Proximitor & acceleration).
• Transducer power supply: -24 Vdc.
• Built-in internal barriers for hazardous-safe wiring (I/O type 06).

Sensitivity Ranges (Selectable)

• Radial Vibration: 3.94 mV/µm (100 mV/mil) or 7.87 mV/µm (200 mV/mil).
• Thrust & Eccentricity: same options as radial.
• Differential Expansion: 0.394 mV/µm (10 mV/mil) or 0.787 mV/µm (20 mV/mil).
• REBAM: 40 mV/µm (1000 mV/mil) or 80 mV/µm (2000 mV/mil).
• Acceleration: 10 mV/(m/s²) (100 mV/g).
• Velocity (Velomitor): 20 mV/(mm/s) pk, 5.8 mV/(mm/s) pk, or 4 mV/(mm/s) pk options.

Output Signals & Recorder

• Buffered transducer outputs: front coaxial per channel, 550 Ω impedance.
• Recorder outputs: +4 to +20 mA proportional to full scale.
• Load resistance: 0 to 600 Ω, voltage compliance 0 to +12 Vdc.
• Resolution: 0.3662 µA/bit, update rate ≤100 ms.
• Shaft Absolute outputs: per channel group, 300 Ω impedance.

Accuracy & Linearity (at +25°C)

• Direct & Gap measurement: ±0.33% of full scale typical, max ±1%.
• 1X and 2X vector filters: ±0.33% typical, max ±1%.
• Smax: within ±5% max.
• Not 1X filter: ±3% for speeds <30,000 cpm, ±8.5% for >30,000 cpm.
• Thrust & Differential Expansion: ±0.33% typical, ±1% max.
• Acceleration & Velocity: ±0.33% typical, ±1% max (excl. filters).

Frequency Response & Filtering

• Radial Vibration direct filter: -3dB at 4-4000 Hz or 1-600 Hz (user programmable).
• Gap filter: -3dB at 0.09 Hz.
• Not 1X notch filter: stopband rejection -34.9 dB.
• 1X and 2X vector filter: rejection -57.7 dB, constant Q.
• Acceleration high/low pass: 4-pole (80 dB/decade).
• Velocity RMS range: 10 to 5500 Hz (-3dB), peak: 3 to 5500 Hz.

Power Consumption & Environment

• Typical power: 7.7 watts.
• Temperature range: rated for industrial panel use (0 to +65°C operating).
• Environmental tolerance: designed for harsh plant floors, EMI/RFI immune.
• Anti-interference: internal barriers & robust filtering reduce noise.

Physical Dimensions & Weight

• Height x Width x Depth: 241.3 mm x 24.4 mm x 241.8 mm (9.50 x 0.96 x 9.52 in).
• Weight: 0.91 kg (2.0 lb).

Installation & Maintenance Ease

• Direct plug-in to 3500 rack – no extra cabling.
• Internal terminations reduce wiring errors.
• Front LEDs help fast troubleshooting (OK/TX/RX/Bypass).
• Hot-swappable design minimizes downtime.
• Recorder outputs short-circuit proof – monitor stays safe.
• Clear labeling for transducer inputs & barrier connections.

Compatibility

• Fits Bently Nevada 3500 rack systems.
• Works with Velomitor, Proximitor, accelerometer sensors.
• Compatible with standard 3500 communication modules.
• Supports both proximity probes and seismic accelerometers on same card.

Certifications & Compliance

• CE marked for European compliance.
• Designed to API 670 standards.
• Hazardous area option: 00 = none (non-incendive for safe area).
• Internal barriers provide intrinsic safety when external barriers required.

Package Contents

• 1 x 3500/42-06-00 Proximitor Seismic Monitor module.
• Documentation: quick start guide (digital).
• No additional cables – direct rack integration.

Warranty & Shipping

• 12-month warranty from shipment date.
• Covers manufacturing defects and workmanship.
• Fast dispatch: 12-24 hours after order confirmation.
• Shipping carriers: FedEx, UPS, DHL – tracking provided.

Expert Review – Senior Machinery Engineer

• “Exceptional stability for turbine and compressor monitoring.”
• 4-channel design saves rack space and reduces cost per point.
• The internal barrier I/O (type 06) simplifies hazardous area wiring.
• Accuracy (±0.33% FS) meets most API 670 critical machinery needs.
• Recommended for continuous vibration monitoring in refineries and power plants.

Manager’s Insight – Procurement & Reliability

• Invest in genuine Bently Nevada to avoid false trips.
• 3500/42-06-00 lowers maintenance due to hot-swap capability.
• Long-term spare parts availability makes it future-proof.
• Best value for critical machines where downtime costs >$10k/hour.

Suitable Equipment & Applications

• Steam turbines, gas turbines, compressors, fans, pumps.
• Generators, motors with sleeve bearings, blowers.
• Paper mills, petrochemical plants, offshore platforms.
• Ideal for shaft vibration, thrust position, eccentricity, differential expansion monitoring.
• Also for casing acceleration and velocity (Velomitor) measurement.

Frequently Asked Questions (FAQ)

Q1: Can I mix proximity probes and accelerometers on same card?

Yes. The 3500/42-06-00 accepts Prox/Accel on channels 1-4. You can freely combine sensor types per channel.

Q2: What is the maximum cable length from sensor to monitor?

Up to 305 meters (1000 feet) for proximity probes. For Velomitor sensors, keep below 300 meters for best signal integrity.

Q3: Does this module support external barriers?

Yes. I/O type 06 includes internal barriers. For external zener barriers (e.g., MTL764), accuracy may shift ±11% under RF immunity – plan accordingly.

Q4: My machine speed exceeds 30,000 cpm. Is Not 1X filter accurate?

Accuracy becomes ±8.5% above 30,000 cpm. For high speeds, use 1X vector filter or direct measurement for better precision.

Q5: How to verify monitor health without removing it?

Check front OK LED. Use software via 3500 rack communication module to read internal diagnostic registers.

Experience Tip – Selecting between 06 and other I/O options

Choose 3500/42-06-00 if you need internal barriers and 4 Velomitor inputs. For non-hazardous areas with external terminations, pick standard I/O. This version saves installation time.

Q6: Can I replace a failed 3500/42 with this -06 version?

Yes, as long as the rack configuration supports internal barrier I/O. Check your existing I/O module type; -06 is backward compatible in most 3500 racks.

Q7: What is the recommended calibration interval?

Bently Nevada suggests 12 months for critical machinery. Use a portable calibrator to verify sensitivity and recorder outputs.

Q8: Does the monitor store configuration in non-volatile memory?

Yes. All filter settings, sensitivity, and alarm setpoints remain after power loss. No reprogramming needed after restart.

Q9: How to reduce electrical noise on buffered outputs?

Use shielded coaxial cables. Connect shield to ground at monitor end only. Internal 550 Ω impedance helps but avoid long unshielded runs.

Q10: What spare parts should I keep?

Keep one spare 3500/42-06-00 module per 5 installed. Also stock Velomitor sensors and 3300 proximity probe cables.

Purchasing Guidance – Choose the Right Configuration

• Verify your existing rack accepts 3500/42 series.
• Need internal barriers? Then -06 is your correct I/O type.
• No hazardous area? Option 00 is fine. For intrinsic safety, check barrier certifications.
• Plan for 4 channels of Prox/Accel/Velomitor mix – this module fits all.
• Check sensitivity range before ordering: confirm with your sensor datasheet.
• Consider expedited shipping (12-24h) to minimize plant downtime.

For technical support, contact our engineers. Genuine Bently Nevada guaranteed.