Bently Nevada 3500/45-05-00 Position Monitor

3500/45-05-00 Bently Nevada Position Monitor

Product Introduction

The 3500/45-05-00 from Bently Nevada provides versatile position monitoring for rotating machinery. This 4-channel device accepts AC LVDT inputs through the internal termination I/O module. It conditions each signal to deliver accurate position measurements. Additionally, it continuously compares these values against programmable alarm setpoints. Therefore, operators receive reliable protection for thrust position, differential expansion, case expansion, and valve position applications.

Key Technical Specifications

The 3500/45-05-00 accepts one to four signal inputs depending on configuration. Input impedance for AC LVDT inputs is 137 kΩ. Power consumption varies by I/O module type. With the AC LVDT I/O module, typical consumption is 8.5 watts. For standard Position I/O, it is 7.7 watts. For Rotary Potentiometer I/O, consumption drops to 5.6 watts.

The monitor includes multiple sensitivity options. For Thrust measurement, choose 3.94 mV/μm (100 mV/mil) or 7.87 mV/μm (200 mV/mil). Differential Expansion offers 0.394 mV/μm (10 mV/mil) or 0.787 mV/μm (20 mV/mil). Ramp Differential Expansion provides four options from 0.394 V/mm to 7.874 V/mm.

AC LVDT Case Expansion and Valve Position Sensitivities

For AC LVDT Case Expansion, three sensitivity options are available. These include 28.74 mV/V/mm (0.73 mV/V/mil), 15.35 mV/V/mm (0.39 mV/V/mil), and 9.45 mV/V/mm (0.24 mV/V/mil). For AC LVDT Valve Position, the 3500/45-05-00 offers even more flexibility. Seven sensitivity options range from 28.74 mV/V/mm down to 3.15 mV/V/mm.

Rotary Potentiometer Valve Position uses 41 mV/degree rotation. Rotary Position Transducer (RPT) Valve Position offers 140 mV/deg, 70 mV/deg, or 50 mV/deg rotation. Consequently, this monitor adapts to numerous sensor types and applications.

Recorder Outputs and Resolution

Recorder outputs provide +4 to +20 mA signals proportional to the monitor's full-scale range. The 3500/45-05-00 offers individual recorder values for each channel. Note that Ramp and CIDE (Complimentary Input Differential Expansion) channels do not have dedicated recorder outputs. Monitor operation remains unaffected by short circuits on recorder outputs.

Voltage compliance ranges from 0 to +12 Vdc across the load. Load resistance must be between 0 and 600 Ω. Resolution is 0.3662 µA per bit. Error is ±0.25% at room temperature and ±0.7% over the full temperature range. Update rate is 100 ms or less.

Accuracy and Frequency Response

The 3500/45-05-00 delivers excellent measurement accuracy across all modes. Thrust and Differential Expansion accuracy is within ±0.33% of full-scale typical, with ±1% maximum. The same accuracy applies to Complimentary Input Differential Expansion (CIDE). Case Expansion and Valve Position measurements also meet this high standard.

Frequency response uses two filters. The direct filter is -3 dB at 1.2 Hz. The gap filter is -3 dB at 0.41 Hz. This filtering ensures stable readings while rejecting high-frequency noise. The monitor responds appropriately to slow thermal movements and expansion changes.

Front Panel Indicators

Three front panel LEDs provide clear operational status. The OK LED indicates when the 3500/45-05-00 is operating properly. The TX/RX LED shows communication activity with other modules in the 3500 rack. The Bypass LED lights when the monitor is in Bypass Mode. These simple indicators help operators quickly verify monitor health.

Mechanical and Environmental Specifications

The monitor module measures 241.3 mm x 24.4 mm x 241.8 mm (9.50 in x 0.96 in x 9.52 in). It weighs 0.91 kg (2.0 lb). The I/O module adds approximately 0.20 kg to 0.46 kg depending on barrier requirements.

Operating temperature ranges from -30°C to +65°C (-22°F to +150°F) when using internal or external termination I/O modules. Storage temperature extends from -40°C to +85°C (-40°F to +185°F). Humidity tolerance is 95% non-condensing. Therefore, the 3500/45-05-00 suits harsh industrial environments.

Rack Space and Installation

This monitor occupies one full-height front slot in the 3500 rack. The I/O module requires one full-height rear slot. Always power down the rack before installation. Use proper grounding for all transducer cables. After installation, verify communication using the TX/RX LED.

Firmware and Software Requirements

When adding the 3500/45-05-00 to an existing 3500 system, specific version requirements apply. You need 3500/20 RIM Firmware revision G or later. The 3500 Configuration Software must be version 2.41 or greater. For Valve Position using RPT, you must have 3500 Configuration Software 3.00 or higher. Additionally, 3500 Data Acquisition needs version 2.20 or later.

Packaging List

• 3500/45-05-00 Position Monitor Module (Main Board) – 1 unit

• AC LVDT Position I/O Module with Internal Terminations – 1 unit

• Installation quick reference guide

Shipping Information

All orders ship via FedEx, UPS, or DHL. Tracking numbers are provided within 24 hours after dispatch. International shipping is available worldwide.

Frequently Asked Questions (FAQ)

1. What I/O module type is included with the 3500/45-05-00?
The 3500/45-05-00 includes I/O Module Type 05, which is the AC LVDT Position I/O Module with Internal Terminations. This configuration supports AC LVDT sensors directly.

2. How many channels does this position monitor support?
The Bently Nevada 3500/45-05-00 supports up to four input channels. Each channel can be configured for different measurement types including thrust, expansion, or valve position.

3. What power supply does the monitor provide for AC LVDT sensors?
The 3500/45-05-00 supplies 2.3Vrms at 3400 Hz sine wave for AC LVDT inputs. This built-in excitation eliminates the need for external signal conditioners.

4. What software version is required for RPT valve position applications?
For Rotary Position Transducer (RPT) valve position measurements, you must use 3500 Configuration Software version 3.00 or greater. Earlier versions do not support RPT configuration.

5. What is the accuracy of the recorder outputs?
Recorder output error is ±0.25% at room temperature and ±0.7% over the full temperature range. Resolution is 0.3662 µA per bit with an update rate of 100 ms or less.