176449-02 Bently Nevada 3500/42M Proximitor Seismic Monitor Module In Stock

Product Overview

The 176449-02 is the enhanced 4-channel 3500/42M Proximitor Seismic Monitor card from Bently Nevada designed for the 3500 Series machinery protection framework.

This primary processing card conditions dynamic sensor inputs to continuously assess mechanical health on critical rotating equipment.

It processes signals from eddy current proximity probes, Velomitor sensors, and piezoelectric accelerometers simultaneously.

Engineers program each channel pair individually to monitor radial vibration, axial thrust, differential expansion, or shaft absolute parameters.

The card compares real-time machinery metrics against user-configured alarm limits to trigger protective relay outputs before catastrophic damage occurs.

Technical Specifications

• Brand: Bently Nevada
• Part Number: 176449-02
• Model Name: 3500/42M Proximitor Seismic Monitor
• Series: 3500 Series Machinery Protection System
• Channel Capacity: Accepts 1 to 4 transducer inputs across two programmable channel pairs
• Power Consumption: 7.7 Watts typical power consumption
• Standard Input Impedance: 10 kΩ for Proximitor probe and accelerometer signal paths
• Radial Vibration Sensitivity: 3.94 mV/µm (100 mV/mil) or 7.87 mV/µm (200 mV/mil)
• Thrust & Eccentricity Sensitivity: 3.94 mV/µm (100 mV/mil) or 7.87 mV/µm (200 mV/mil)
• REBAM Sensitivity: 40 mV/µm (1000 mV/mil) or 80 mV/µm (2000 mV/mil)
• Acceleration Input Sensitivity: 10 mV/(m/s²) (100 mV/g)
• Velocity Input Sensitivity: 20 mV/(mm/s) pk (500 mV/in/s), 5.8 mV/(mm/s) pk, or 4 mV/(mm/s) pk
• Direct Filter Frequency Response: Programmable single-pole -3 dB at 4 Hz to 4000 Hz or 1 Hz to 600 Hz (±1% accuracy)
• Gap Filter Response: -3 dB point at 0.09 Hz
• Vector Filtering: 1X and 2X constant Q tracking filters with minimum -57.7 dB stopband rejection
• Direct Signal Processing Accuracy: Within ±0.33% of full-scale typical (±1% maximum limit)
• Transducer Power Supply: Output voltage rated at -24 Vdc
• Current Recorder Outputs: +4 to +20 mA individual outputs per channel proportional to full scale (0 to 600 Ω load)
• Digital Recorder Resolution: 0.3662 µA per bit with maximum ±0.7% error across full operating temperature
• Front Panel Outputs: 4 coaxial BNC short-circuit protected connectors (550 Ω output impedance)
• Buffered Output Impedance: 300 Ω for Shaft Absolute buffered channel group connections
• Physical Dimensions: 241.3 mm x 24.4 mm x 241.8 mm (9.50 in x 0.96 in x 9.52 in)
• Module Weight: 0.91 kg (2.0 lbs)

Application Scenarios & Target Equipment

Plant engineers implement the 176449-02 card on high-value turbomachinery operating in power generation, petrochemical processing, and oil refining.

Target Machinery Platforms:

• Heavy industrial steam turbines and gas turbine generator sets
• Multi-stage centrifugal boiler feed pumps and axial pipeline compressors
• Large induction motors, gearboxes, and industrial fans
• Hydroelectric turbine-generator shafts requiring absolute shaft vibration measurement

Diagnostic & Protection Capabilities:

• Early detection of shaft unbalance, mechanical misalignment, and rotor rub conditions via 1X/2X tracking vectors
• Continuous monitoring of axial position to prevent rotor-to-stator contact inside steam turbines
• Real-time Smax phase vector evaluation to identify unstable fluid film bearing whip or whirl phenomena
• High-frequency rolling element bearing degradation tracking using REBAM filtering modes

Installation Guidelines & Commissioning

• Seat the 176449-02 card into any vacant full-height front slot of the main rack except slot 1.
• Verify rear I/O card compatibility before powering on the rack assembly.
• Connect proximity probe extension cables to the matching rear I/O field terminal blocks.
• Verify -24 Vdc transducer power at the terminal connectors using a digital multimeter prior to configuration loading.
• Use 3500 System Rack Configuration Software to assign transducer scale factors, filter corner frequencies, and alarm delay timers.
• Route buffered front panel BNC signals directly to portable FFT vibration analyzers during dynamic balancing procedures.

Ordering, Packaging & Shipping Terms

• Part Included: Bently Nevada 176449-02 3500/42M Proximitor Seismic Monitor processing board.
• Packaging Protection: Sealed inside anti-static ESD shielding bags with custom high-density foam casing.
• Dispatch Speed: Express warehouse turnaround ships within 24 to 48 hours of order confirmation.
• Global Freight Options: Worldwide door-to-door express delivery handled by FedEx, UPS, or DHL.
• Warranty Coverage: Includes comprehensive 12-month factory defect replacement warranty.

Global PLC Spare HUB's Insight

Our field engineering team regularly assists site technicians with troubleshooting signal integrity issues on 3500 Series racks.

On a recent call at a power station, a 3500/42M Proximitor Seismic Monitor triggered intermittent Not OK status alarms on channel 3 after scheduled maintenance.

The site crew suspected a faulty 176449-02 monitor card and requested an immediate hardware swap.

Our diagnostic evaluation showed that the card hardware performed correctly, but field wiring installed near a variable frequency drive induced high-frequency noise onto the proximity probe line.

Grounding the cable shield correctly at the machine casing terminal box brought the gap voltage back to -12 Vdc, instantly clearing the Not OK fault without requiring component replacement.

Purchasing Guide & Channel Selection

Check your system configuration file to ensure the 176449-02 card revision matches your existing rack software version.

Identify whether your application requires standard internal signal conditioning or specialized software key options like REBAM or Shaft Absolute processing.

Confirm sensor compatibility: proximity probes require negative supply voltage, whereas self-generating velocity pickups require dedicated signal conditioning setup.

Frequently Asked Questions

Question: Can I substitute the 176449-02 card directly for older non-M 3500/42 monitor modules?

Answer: Yes, the 3500/42M provides backward compatibility, but you must update your rack configuration file using 3500 Rack Configuration Software to recognize the M-series hardware architecture.

Question: How do the front panel BNC connectors handle short circuits during diagnostic routine checks?

Answer: Each front coaxial connector includes internal 550 Ω output impedance current-limiting circuitry to prevent monitor damage or channel disruption if shorted during testing.

Question: What causes the Bypass LED to illuminate solid yellow on the front panel?

Answer: A solid yellow Bypass LED indicates that an operator activated channel or rack bypass manually from the software interface or via dedicated digital inputs on the rear I/O module.

Question: How do I verify if a channel NOT OK fault originates from the monitor card or the field sensor loop?

Answer: Measure the DC gap voltage at the rear I/O terminals using a digital meter. If DC voltage sits between -2 Vdc and -18 Vdc for proximity probes, the field loop is healthy and the issue lies in threshold programming or module hardware.

Question: Why do the 4-20 mA recorder outputs show zero current despite normal vibration display values?

Answer: Verify that the external loop circuit receives external power if required by your specific rear I/O board variant, and check that total loop load resistance stays strictly below 600 Ω.

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