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Bently Nevada 3500/50M Tachometer Module

The Bently Nevada 3500/50M is a Tachometer Module developed for monitoring rotational speed and related machine operating parameters within the 3500 Series protection platform.

The module accepts input signals from:

• Proximity probe transducers

• Magnetic pickup sensors

It measures:

• Shaft rotational speed

• Rotor acceleration

• Reverse rotation

• Zero-speed conditions

The 3500/50M compares measured values with programmed alarm setpoints and can generate alarm conditions through the 3500 system architecture. Configuration is performed through 3500 Rack Configuration Software, allowing engineers to define speed monitoring functions according to machine requirements.

The module can also provide conditioned Keyphasor signals to the 3500 rack backplane, allowing other monitoring modules to use timing reference signals without requiring a separate Keyphasor module in certain configurations. 

Bently Nevada 3500/50M

Manufacturer:
Bently Nevada

Series:
3500 Machinery Protection System

Product Type:
Tachometer Module

Channel Configuration:
Dual-channel speed monitoring

Primary Function:
Shaft speed and rotor condition monitoring

Compatible Sensors:
Proximity probes and magnetic pickups

Dual-Channel Speed Measurement

The 3500/50M provides two independent tachometer channels for monitoring shaft speed and machine operating conditions.

Multiple Monitoring Functions

The module supports:

• Speed band monitoring

• Zero speed detection

• Rotor acceleration monitoring

• Reverse rotation detection

Programmable Alarm Functions

Users can configure alarm thresholds and delays according to equipment operating requirements.

Keyphasor Signal Conditioning

The module can provide conditioned Keyphasor signals for use by other monitoring modules within the 3500 rack system.

Industrial Protection Design

Designed for continuous operation in demanding industrial environments, supporting critical rotating machinery protection applications.

• Provides accurate real-time shaft speed monitoring

• Supports turbine and compressor protection applications

• Detects abnormal speed conditions quickly

• Reduces risk of mechanical damage caused by speed-related faults

• Simplifies integration within existing 3500 systems

• Supports predictive maintenance programs

Power Generation

Used for steam turbines, gas turbines, generators, and turbine supervisory systems.

Oil & Gas Industry

Applied in compressors, expanders, and critical rotating equipment.

Petrochemical Plants

Supports machinery monitoring and protection systems.

Industrial Manufacturing

Used for high-speed rotating machinery requiring accurate speed feedback.

Energy Infrastructure

Provides speed monitoring for equipment where reliability and operational safety are essential.

Q1: What is the Bently Nevada 3500/50M used for?

A:
The 3500/50M is used for monitoring shaft speed, rotor acceleration, reverse rotation, and zero-speed conditions in rotating machinery.

Q2: How many channels does the 3500/50M have?

A:
The module provides two independent tachometer input channels.

Q3: Can the 3500/50M measure vibration?

A:
No. The 3500/50M is a speed monitoring module, not a vibration measurement module.

Q4: What sensors are compatible with the 3500/50M?

A:
The module accepts signals from proximity probes and magnetic pickup sensors.

Q5: Is the 3500/50M an overspeed protection module?

A:
No. The 3500/50M provides speed monitoring functions but is not designed as a dedicated overspeed detection system. Dedicated overspeed applications use the Bently Nevada 3500/53 system. 

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