3500/40M BENTLY NEVADA Proximitor Monitor Module

• Brand
  BENTLY NEVADA
• Model
  3500/40M
• Product Name
  Proximitor Monitor Module
• Place of Origin
  United States
• HS Code
  85371011
• Dimensions
  241.3 mm × 24.4 mm × 241.8 mm
• Weight
  0.91 kg
• Operating Temperature
  ‑30 °C to +65 °C
• Storage Temperature
  ‑40 °C to +85 °C
• Power Supply
  24 V DC
• Warranty
  12 month
• Product Status
  New and original

Bently Nevada 3500/40M Input and Output Specifications

Input Specifications

Input Channel Configuration: Equipped with 4 independent measurement channels, which can be configured into 2 groups of X-Y orthogonal transducer pairs to monitor radial vibration and axial thrust displacement of rotating equipment.

Supported Input Signals: Accepts differential dynamic signals from standard Bently Nevada eddy-current proximity probes, with a valid input voltage range of -24 VDC to +24 VDC.

Input Impedance: Features 10 kΩ impedance under standard single-channel working mode, and 50 kΩ effective impedance for TMR parallel bus I/O connection scenarios.

Measurement Sensitivity: Supports two configurable sensitivity parameters: 3.94 mV/μm (100 mV/mil) and 7.87 mV/μm (200 mV/mil), adapting to vibration and displacement measurement requirements of different working conditions.

Signal Diagnosis: Integrates full-time self-diagnosis function, capable of detecting probe open circuit, short circuit and signal overload faults. It can automatically mark fault codes and lock alarm status to ensure abnormal state tracing.

Output Specifications

Analog Output: Offers galvanically isolated 4–20 mA DC analog output signals that correspond to actual vibration and displacement values, supporting remote signal transmission and real-time data trend analysis for DCS and PLC systems.

Alarm & Trip Output Logic: Comes with customizable alert and danger alarm thresholds. Each channel supports latching and non-latching alarm modes, providing accurate logic judgment for equipment safety interlock protection.

System Communication Output: Uploads processed measurement data, channel operating status and fault alarm information to the 3500 rack and upper-level monitoring software through the built-in rack bus.

Status Indication Output: Onboard LED indicators intuitively display module power supply, channel operation, alarm and fault diagnosis status, facilitating on-site quick inspection and maintenance.

General Technical Features

Power Consumption: Typical operating power consumption is 7.7 W.

Operating Temperature: Operating temperature range covers -40 ℃ to +70 ℃, adapting to complex and harsh industrial field environments.

Application Scope: Compliant with API 670 industry standards, it is widely applied to monitor shaft vibration, shaft displacement and thrust position of core equipment such as turbines, compressors and industrial pumps.

Bently Nevada 3500/40M Operation Guide

The 3500/40M is a 4-channel proximity monitor within the 3500 machinery protection system. It performs signal acquisition, data processing and alarm decision-making for eddy-current transducers. All parameter settings are implemented using the 3500 Rack Configuration Software.

Hardware Installation & Power-on Operation

Put on an anti-static wrist strap before touching the module. Insert the 3500/40M into slots 2-14 of the 3500 rack and guarantee secure engagement with the backplane. Install the matching I/O termination module at the rack rear. Wire proximity probes and extension cables to rear terminals. Cable shields must be single-point grounded inside the cabinet to prevent ground-loop interference. Power up the rack and check front-panel LED status. A solid OK LED indicates normal module operation. If the Bypass or Fault LED is lit, troubleshoot wiring, transducer loops and rack power supply first. Hot-swap replacement is supported; re-download configuration once a new module is installed.

Software Configuration Procedure

Connect the PC to the 3500 rack, start the 3500 Rack Configuration Software and open the target rack project. Navigate to the slot assigned for the 3500/40M. Channels are configured as pairs: Channels 1-2 for one measurement function, and Channels 3-4 for the same or separate tasks. Select measurement types including Radial Vibration, Thrust Position, Differential Expansion, Eccentricity and REBAM. Set transducer scale factor, full-scale range, engineering units and filter parameters. Define Alert and Danger alarm setpoints, alarm delay, and select latching or non-latching alarm modes. Configure Not-OK fault delay for probe open-circuit and short-circuit detection. Assign 4-20 mA analog output mapping for each channel. Save the project file and download the full configuration to the rack. Validate download completion and ensure no module-related faults are reported.

Commissioning and Field Check

Adjust the probe mounting gap to achieve a nominal gap voltage of approximately -10 VDC and confirm the value lies within the transducer linear range. Carry out signal-loop validation and verify static readings, gap values and vibration measurements. Confirm 4-20 mA analog outputs vary proportionally with actual process values. Simulate transducer faults to test Not-OK diagnostic performance. Force alarm conditions to verify Alert / Danger relay outputs and interlock logic. Complete commissioning acceptance in compliance with API 670 standards.

Daily Operation & Alarm Handling

Track real-time measurement data via display software or upper-level DCS platforms and routinely inspect front-panel LED status. After root-cause removal, reset latched alarms through rack switches, display module, configuration software or host system commands. Non-latching alarms clear automatically when readings drop below alarm thresholds. Illumination of the Bypass LED means the corresponding channel is under bypass status; inspect software bypass settings, hardware defects or firmware incompatibility.

Routine Maintenance & Safety Notice

Periodically inspect signal loops for cable deterioration, loose terminals and improper grounding. Execute calibration verification on a scheduled basis. Never disconnect transducer cables during equipment operation, as this may cause false trips. Maintain cleanliness of front-panel BNC buffer output ports. Any modification to alarm thresholds shall comply with on-site safety protocols, and updated configuration files must be saved. Refer to the official user manual for complete wiring schematics and calibration procedures.

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