Bently Nevada 3500/42-04-00 Proximitor Seismic Monitor

Product Introduction

The Bently Nevada 3500/42-04-00 monitor serves as a foundational component for protecting critical rotating machinery. This module provides continuous machinery protection and delivers essential operational information by comparing monitored parameters against configured alarm setpoints. Specifically, this model features the -04 I/O module type, which includes internal Zener barriers and internal terminations for four proximity/accelerometer inputs. This design simplifies installation in hazardous locations because it removes the need for separate external barrier panels. This four-channel monitor offers versatile configuration options to handle a wide array of transducer types, including proximity probes, accelerometers, and velocity sensors.

Technical Specifications

Inputs and Signal Conditioning

The 3500/42-04-00 accepts signals from one to four proximity, velocity, or acceleration transducers. This module typically consumes 7.7 watts of power. The standard I/O module provides an input impedance of 10 kΩ for both Proximitor and acceleration inputs. Moreover, this module supports a wide range of sensitivities depending on the measurement type. For instance, radial vibration, thrust, and eccentricity measurements can operate at either 3.94 mV/μm or 7.87 mV/μm. Acceleration inputs function at 10 mV/(m/s²), while velocity inputs offer multiple scaling options, including 20 mV/(mm/s) pk.

Frequency Response and Filtering

The Bently Nevada 3500/42-04-00 offers extensive signal conditioning capabilities. For radial vibration, the direct filter is user-programmable, with a single-pole -3 dB point ranging from 4 Hz to 4000 Hz. Furthermore, this module includes specialized filters like the Not 1X filter, which achieves a minimum rejection of -34.9 dB in the stopband. Additionally, the 1X and 2X vector filters attain a minimum rejection of -57.7 dB. For direct and gap measurements, the accuracy typically stays within ±0.33% of full scale and reaches a maximum of ±1%. For acceleration measurements, the filter quality uses a 4-pole design for both high-pass and low-pass filters.

Outputs and Monitoring

Several clear visual status LEDs appear on the front panel. Specifically, the OK LED indicates proper module operation, the TX/RX LED shows communication activity with other modules in the rack, and the Bypass LED signals when the monitor is in Bypass Mode. Additionally, the front of each monitor has one coaxial connector for each channel, which serves as a buffered transducer output. These connectors are short-circuit protected and feature an output impedance of 550 Ω.

Recorder and Power Supply

The 3500/42-04-00 provides individual +4 to +20 mA recorder outputs for each channel. These values are proportional to the monitor's full-scale range. Importantly, short circuits on these recorder outputs do not affect monitor operation. The voltage compliance for the current output ranges from 0 to +12 Vdc across a load resistance of 0 to 600 Ω. The resolution is rated at 0.3662 µA per bit, with an error margin of ±0.25% at room temperature.

Environmental and Mechanical Specifications

Operating Conditions

The monitor operates at +25 ºC (+77 ºF) unless otherwise noted. This module maintains high accuracy across a wide temperature range, which ensures reliable performance in demanding industrial environments. The robust construction makes it suitable for installation in 3500 series racks, which are typically found in power generation, oil and gas, and heavy manufacturing facilities.

Physical Dimensions

The module board measures 241.3 mm in height, 24.4 mm in width, and 241.8 mm in depth. The gross weight is approximately 0.91 kg (2.0 lbs). The module fits standard 3500 series rack slots and is mechanically interchangeable with other modules in the product line.

Installation and Configuration

Mounting and Connections

Installing the Bently Nevada 3500/42-04-00 is straightforward. First, ensure the 3500 rack is powered down before inserting or removing any module. Then, slide the module into the designated slot until it is fully seated. After that, secure the module using the retaining screws on the top and bottom. The internal terminations on this -04 version allow for direct wiring of field transducers to the module's I/O connectors, which simplifies the overall installation process.

Transducer Compatibility

This monitor works with a variety of Bently Nevada transducers. For proximity measurements, it supports 3300 XL and 7200 series proximity probes. For seismic measurements, it supports a range of accelerometers and velocity sensors. The user must configure the sensitivity settings in the 3500 rack configuration software to match the specific transducers. The internal barriers provide intrinsic safety for connections to transducers located in hazardous areas.

Packaging List

The shipment for the 3500/42-04-00 includes the following items:

• 1 x Bently Nevada 3500/42-04-00 Proximitor Seismic Monitor Module

• 1 x Installation and Configuration Manual

• 1 x Standard I/O Connector Kit with internal terminations

Note: Certificates and warranty documents are not included in the packaging list and are handled separately.

Shipping Method: All orders are shipped via FedEx, UPS, or DHL to ensure fast and reliable delivery worldwide.

Frequently Asked Questions (FAQ)

1. What is the primary function of the Bently Nevada 3500/42-04-00?
The 3500/42-04-00 serves as a machinery protection monitor. It continuously measures vibration and position parameters from up to four transducers and alerts operators if these values exceed set alarm limits.

2. What types of transducers are compatible with the 3500/42-04-00?
This module accepts signals from a wide range of transducers, including proximity probes, accelerometers, and velocity sensors. The specific compatibility depends on the configuration chosen for each channel.

3. What is the difference between the 3500/42-04-00 and other versions?
The "-04" designation indicates this specific I/O module includes internal Zener barriers and internal terminations for four proximity or accelerometer inputs. This makes it ideal for applications requiring intrinsic safety.

4. How do I set up the alarm limits for the 3500/42-04-00?
You can configure alarm limits using the 3500 rack configuration software, such as the 3500 System Configuration software. The software allows users to set danger, alert, and bypass settings for each channel.

5. Can the 3500/42-04-00 be used in hazardous area applications?
Yes, the internal Zener barriers on the -04 I/O module are specifically designed for hazardous area approvals. However, ensure that the overall system complies with all relevant local safety regulations.