BENTLY 135473-01 Approximator/Seismic Monitoring Module

Features Overview

The 3500 System is intended for continuous,permanent monitoring of rotating and reciprocating machinery in a variety of industries. 

It is specifically designed for use in auto-shutdown machineryprotection applications that require extremely high reliability and availability.

Applications

Machine types addressed by the 3500 System include but are not limited to the following:

l Industrial gas and steam turbines in power

generation and mechanical drive service

l Aeroderivative gas turbines in power generation

and mechanical drive service

l Hydro-electric turbines in power generation service

l Air or Process Gas Compressors (radial/axial,centrifugal/positive displacement)

l Turbo Expanders

l Electric motors and generators

l Exciters

l Gear boxes

l Pumps (centrifugal and positive displacement)

l Fans

l Blowers

l Reciprocating compressors

l Extruders and pelletizers

Monitor Module Footnotes

1. Only standard differential expansion capabilities provided. For ramp differential expansion and complementary

input differential expansion, use the 3500/45 Position Monitor, instead.

2. The 3500/42M provides individual 4 to 20 mA proportional outputs for each channel. The 3500/40M does NOT

provide 4 to 20 mA outputs.

3. The monitor channels are programmed in pairs and can perform up to two of these functions at a time. Channels

1 and 2 can perform one function, while channels 3 and 4 perform another (or the same) function.

4. Channels configured for velocity or acceleration provide only direct amplitude. Channels configured for Velocity

II or Acceleration II provide 1X amplitude/phase and 2X amplitude/phase and bias voltage in addition to direct amplitude.

5. Any vibration channel can be configured for conventional “pie-shaped” acceptance region alarms. When

configured for circular acceptance regions, circular (rather than pie-shaped) acceptance region alarms can be

enabled. Refer to the 3500/42M Operations/Maintenance Manual for additional information, or contact your nearest sales professional.

6. Only channels 3 and 4 can be used for Case Expansion measurements.

7. The 3500/46M provides frequency response characteristics suitable for use on machines with very slow

rotational speeds, such as hydraulic turbine/generator sets, which often operate at speeds of 100 RPM or lower.

Also, special signal conditioning and tracking filtering is provided, allowing detection of rough load zone

operation, shear pin failure, and other hydro-specific conditions.

8. The 3500/50M is not intended for use in overspeed protection applications. Use the 3701/55 Emergency

Shutdown (ESD) system, instead.

9. Both Zero Speed and Reverse Rotation channel types require both channels of the 3500/50 module, making it a

single-channel monitor when used in these configurations.

10. The 3500/60 and 3500/61 provide identical functions except the 3500/60 does not provide 4 to 20 mA

proportional outputs. When these outputs are required, use the 3500/61.

11. The 3500/62 is designed to accept static proportional signals such as 4 to 20 mA, 1 to 5 Vdc, or any static

proportional voltage signal between –10 and +10 Vdc. When dynamic signals (i.e., those where waveform

information is required) are used, a 3500/40M or 3500/42M can often be programmed as a custom channel type,

making the 3500 system compatible with virtually any static or dynamic signal from pressure, level,

temperature, vibration, flow, position, speed, or other transducers. Consult the factory or your local Bently

Nevada sales professional for more information.

12. The 3500/64M is primarily intended for monitoring combustor pressure pulsation instabilities (“humming”) in gas turbines.

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