3500 Machinery Protection Systems

The 3500 system is the world-leader at detecting and preventing both missed-trips and false-trips in rotating machinery. With over 85,000 installed worldwide, it provides automatic protection value by tripping monitored machines to prevent expensive damage when needed.

The 3500 system also protects your machines and processes against false-trips that could bring your operation down for no reason, resulting in a costly outage or loss of production.

When connected with our System 1† software, it also provides continuous condition monitoring information for use in a proactive maintenance program.

The 3500 system incorporates the industry’s most extensive selection of machinery measurement parameters combined with software configuration for virtually all machinery monitoring scenarios.

Our Commitment
Bently Nevada has been synonymous with machinery protection and condition monitoring for more than 60 years. Our network of global experts is dedicated to helping customers solve some of their toughest challenges. From refineries and petrochemical plants to hydroelectric facilities and wind farms, Bently Nevada asset condition monitoring offers trusted and proven vibration monitoring equipment and a comprehensive services portfolio to help improve the reliability and performance of production assets like turbines, compressors, motors, generators, and everything in between.

Behind every suite of great products is a team of great people, and the Bently Nevada team is one of the most experienced in the industry. That experience translates into high-quality, flexible and scalable solutions coupled with a dedicated services team focused on providing proactive, consistent support throughout the lifecycle of your operations.

3500 Machinery Protection System Product Overview

3500 Series protection and condition monitoring system is a flexible, scalable platform for continuous, online monitoring of your most critical machinery as well as all other machine assets used in plant-wide processes, all available in a single comprehensive system.

  • Reliable and Compliant
  • Compatible and Flexible
  • Communicates with System 1
  • Available Options
  • Safety Certified

3500 Machinery Protection System Displays

The 3500/94M VGA Touchscreen Display Module with color Touch Screen and I/O module displays vital 3500 data at the machine or in the control room. The VGA features 3500 vibration levels, system and alarm event lists along with module, channel and alarm data and nine custom display options. Pre-built “custom” screens for Direct, 1X, Gap, and alarms with no need to configure make set up easy. There 2 sizes available (10” and 15”) and you can you can view data from up to four separate 3500 racks at just one display. There are also mount options for the display module, including the hinged and latched Face Mount. Hazardous Area certifications are available for the displays.

3500 Machinery Protection System Speed Monitors

The TACH100 Digital Tachometer can serve as a stand-alone speed indicator or in conjunction with any permanently installed monitoring system as a remote speed indicator. The compact unit contains its own power supply, which is convenient when a permanent monitoring system is located at a distance or proximity to the machine is needed to indicate speed. The Digital Tachometer provides a local display indicating machine speed on the machine deck. When double-hearing protection is required, the Digital Tachometer provides a visual indication. Wires can connect in parallel with Keyphasor Proximity Probe input on the monitor rack or directly to the Keyphasor† Proximity Probe. The TACH100 accepts signal and common wires from externally-powered Keyphasor Proximity Probe.

Our 3500/25 Keyphasor Module provides phase reference information in a 3500 rack (you can employ up to four Keyphasors per 3500 rack), enabling advanced machinery diagnostics. It receives input signals from proximity probes or magnetic pickups and converts the once-per-turn or multiple-event-per-turn pulse signals to a precise digital timing measurement. This allows your 3500 system to measure machine speed and vector parameters such as 1X vibration amplitude and phase that are key in determining vital machine behaviors. The Keyphasor measurement is also an integral part of the Bently Nevada† Turbine Supervisory Instrumentation (TSI) suite of sensors specifically for steam turbines. The 3500 System is available as a SIL 2-rated system and with multiple Hazardous Area and country-specific approvals available to tackle any environment.

Our 3500/50M Tachometer Module features 2 channels which accept input from Proximitor probes or magnetic pickups to measure shaft rotating speed, rotor acceleration, or reverse rotation. The 3500/50M Tachometer conditions the inputs and compares the conditioned signals with user-programmable set points that can drive alarms and relay logic in the 3500 relay modules. Alarm options offered with 3500 Rack Configuration software include Speed Band, Zero Speed, Rotor Acceleration and Reverse Rotation. The Keyphasor and speed measurements are also an integral part of the Bently Nevada Turbine Supervisory Instrumentation (TSI) suite of sensors for steam turbines. The 3500 System is available as a SIL 2 rated system and with multiple Hazardous Area and country-specific approvals available. External terminations and internal barrier versions are also available. You should note that the 3500/50M is not designed for Overspeed Detection.

3500 Machinery Protection System Relay Monitors

The 3500/32M 4-Channel Relay Module offers four relay outputs with a highly-configurable relay logic interface. Each of the four outputs can be independently programmed to enable voting by configuring the Alarm Drive Logic for each relay. All channels within the 3500 Machinery Protection System are available to drive complex logic using Not OK status along with Alert and Danger setpoints within the 3500/32M. The 3500/32M offers an easy-to-use interface for highly configurable AND/OR logic combinations and includes ‘Normal’ and ‘True’ and voting options as well as a latching relay by-channel option.

3500/33 16-Channel Relay Module offers 16 relay outputs with a highly-configurable relay logic interface. Each of the sixteen outputs can be independently programmed to enable voting by configuring the Alarm Drive Logic for each relay. All channels within the 3500 Machinery Protection System are available to drive complex logic using Not OK status along with Alert and Danger setpoints within the 3500/33. The 3500/33 offers an easy-to-use interface for highly configurable AND/OR logic combinations and includes ‘Normal’ and ‘True’ and voting options as well as a latching relay by-channel option.

3500 Machinery Protection System Vibration Input Monitors

3500/40M Proximitor Monitor accepts input from Bently Nevada 3300XL series of Proximitor and seismic transducers conditions the signal to provide various vibration and position measurements, and compares the conditioned signals with user-programmable setpoints that can drive alarms and relay logic in the 3500 relay modules. External terminations and internal barrier versions are also available. The 3300XL Proximitor measurements are an integral part of the Bently Nevada Turbine Supervisory Instrumentation (TSI) suite of sensors for steam turbines. Each channel can be programmed using the 3500 Rack Configuration Software to protect machinery and monitor conditions for Radial Vibration, Thrust Position, Differential Expansion, Eccentricity, Acceleration, Velocity, Shaft Absolute, and Circular Acceptance Region parameters. The 3500 System is available as a SIL 2 rated system and with multiple Hazardous Area and country-specific approvals available.

Bently Nevada’s 3500/42M Proximitor/Seismic Monitor offers four programmable channels for the 3500 system, accepting input from Proximitors and seismic transducers. The 3500/42M then conditions the signal to provide various vibration and position measurements and compares the conditioned signals with user-programmable alarms. Additionally, each channel can be programmed using the 3500 Rack Configuration Software to protect machinery and monitor conditions for Radial Vibration, Thrust Position, Differential Expansion, Eccentricity, Acceleration, Velocity, Shaft Absolute, and Circular Acceptance Region parameters.

The 3500/44M Aeroderivative Gas Turbine Monitor is a four channel Aeroderivative Gas Turbine (GT) Vibration Monitor for the 3500 system. The Vibration Monitor accepts four channels of vibration. Each channel pair can apply its own tracking filter based on up to four different Keyphasor inputs from the 3500 rack. The monitor processes signals from the Velomitor† and the accelerometer, filters the measurements, allows Signal Integration, and produces 1X Vibration Tracking and Band-pass Vibration, which is very useful for gas turbine applications. The Vibration Monitor meets the gas turbine manufacturing requirements of Baker Hughes, Rolls Royce, United Technologies and other OEMs.

Our 3500/46M Hydro Monitor is specifically designed to protect and monitor hydro turbine generators. The 3500/46M Processes signals from Proximitors, seismic, dynamic pressure, and air gap sensors. Discreet Input contacts can identify machinery modes such as Rough Load Zone and automate data acquisition and alarms. External terminations are also available. The 3500/46M Hydro Monitor also conditions input and compares signals with alarm setpoints for Hydro Radial Vibration (RV), Hydro Air Gap, Hydro Velocity, Hydro Acceleration, Hydro Thrust, Hydro Stator End Winding (SEW) Vibration; and Dynamic Pressure. Multimode settings are available for all available channel types.

3500 Machinery Protection System Position Monitors

The 3500/45 Position Monitor processes signals from the Bently Nevada 3300XL series of Proximitor transducers, Rotary Position Transducers (RPTs), and AC and DC Linear Variable Differential Transformers (LVDTs). The 3500/45 conditions the input and compares the conditioned signals with user-programmable alarms for Axial (thrust) Position, Differential Expansion (single ramp, dual ramp, or complementary), Case Expansion, and Valve Position. These key measurements are an integral part of the Bently Nevada Turbine Supervisory Instrumentation (TSI) suite of sensors for steam turbines.

3500 Machinery Protection System Temperature Monitors

The six-channel 3500/60 (without recorders) processes the signals from RTDs (resistance temperature detectors) and TCs (thermocouples). The 3500/60 is capable of monitoring temperature or temperature differentials and is typically used for radial bearing or thrust bearing metal temperature in accordance with API670, but can also be used for key process temperatures such as compressor suction and discharge temperatures, steam temperature, motor stator temperatures, among others. The 3500/60 conditions the inputs and compares the conditioned signals with user-programmable setpoints that can drive alarms and relay logic in the 3500 relay modules. External terminations and internal barrier versions are also available. The 3500/60 and 3500/61 provide identical functionality, with the 3500/61 offering additional 4-20mA recorder outputs for each of its six channels. The TC-isolated version provides 250 Vdc of channel-to-channel isolation that is sometimes required for use with high speed mag pickup applications.

Our six-channel 3500/61 (with recorders) processes the signals from RTDs (resistance temperature detectors) and TCs (thermocouples). The 3500/61 is capable of monitoring temperature or temperature differentials and is typically used for radial bearing or thrust bearing metal temperature in accordance with API670, but can also be used for key process temperatures such as compressor suction and discharge temperatures, steam temperature, motor stator temperatures, among others. The 3500/61 conditions the inputs and compares the conditioned signals with user-programmable setpoints that can drive alarms and relay logic in the 3500 relay modules. External terminations and internal barrier versions are also available. The 3500/60 and 3500/61 provide identical functionality, with the 3500/61 offering additional 4-20mA recorder outputs for each of its six channels while the 3500/60 does not. The TC-isolated version provides 250 Vdc of channel-to-channel isolation that is sometimes required for use with high speed mag pickup applications.

Bently Nevada’s 3500/65 16-Channel Temperature Monitor processes the signals from RTDs (resistance temperature detectors) and TCs (thermocouples). The 3500/65 is capable of monitoring temperature or temperature differentials and is typically used for radial bearing or thrust bearing metal temperature in accordance with API670, but can also be used for key process temperatures such as compressor suction and discharge temperatures, steam temperature, motor stator temperatures, among others. The 3500/65 conditions the inputs and compares the conditioned signals with user-programmable setpoints that can drive alarms and relay logic in the 3500 relay modules. The 3500/65 accepts isolated tip thermocouples, 3-wire RTD, 4-wire RTD, or a combination of isolated TC and RTD inputs. External termination blocks are also available. If recorder outputs are required, the 3500/61 six-channel temperature monitor provides additional 4-20mA recorder outputs for each of its six channels.

3500 Machinery Protection System Process & Pressure Monitors

Our six-channel 3500/62 Process Variable Monitor accepts transmitter 4 to 20 mA current inputs or -10 Vdc to +10 Vdc voltage sensor inputs, and then conditions the input and compares the conditioned signals with user-programmable alarm setpoints that can drive alarms and relay logic in the 3500 relay modules. The 3500/62 can also be used for key process measurements such as fluid pressure, compressor suction and discharge pressures, steam pressure, motor current, flow, Megawatts and virtually any other process variable that can then be correlated via vibration.

The four-channel 3500/64 Dynamic Pressure Monitor accepts input from gas turbine dynamic pressure (combustion) transducers and uses this input to drive alarms. The monitor produces band-passed dynamic pressure measured variables. Programmable corner frequencies for the bandpass filter and an additional notch filter can be adjusted as needed. A typical application identifies and tracks gas turbine combustor instabilities. Dynamic Pressure sensors use Bently Nevada charge amplifiers 350500 or 86517 and can integrate a multitude of common dynamic pressure sensors, including the CP series sensors. Additionally, the 3500/64 is available with multiple Hazardous Area and country-specific approvals to tackle any environment.

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About Bently Nevada

Baker Hughes suite of ground breaking Bently Nevada rack-based and distributed machinery condition monitoring software and hardware solutions, vibration monitoring equipment and sensors enable greater asset reliability and enhanced efficiency for your operations, backed by an expert global support system.
Bently Nevada

The Bently Nevada product line has been synonymous with machinery protection and condition monitoring for more than 50 years. From refineries and petrochemical plants to hydroelectric facilities and wind farms, Bently Nevada Asset Condition Monitoring offers trusted and proven vibration monitoring equipment and a comprehensive services portfolio to help improve the reliability and performance of production assets like turbines, compressors, motors, generators, and everything in between.

Machine condition monitoring combines advanced hardware, intelligent software, and trusted service and support – providing a broad, connected view of your operations. Together, they enable you to mitigate risk, boost safety, and reduce maintenance costs, while improving equipment reliability, uptime, and efficiency.

Hardware monitoring systems and sensors protect your equipment and collect rich condition monitoring and diagnostic data for analysis.
Condition monitoring and diagnostics software, like System 1, connects real-time and historical data from production equipment to help you anticipate failure before it occurs.
With scalable deployment and ongoing support service offerings, you can ensure that you’re maximizing the value of your condition monitoring program.

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