2025-09-29 BY
IN Company News

The Bently Nevada 3500/50-01-00-02 is a dual-channel Tachometer Module designed for the 3500 Series Machinery Monitoring System. This module accepts inputs from proximity probes or magnetic pickups to measure shaft rotational speed, rotor acceleration, and direction. It compares these measurements against user-configurable alarm setpoints and generates alarms when thresholds are violated. Configured using the 3500 Rack Configuration Software, the module offers four operational modes:

  • Speed Monitoring with Setpoint Alarming and Speed Band Alarming

  • Speed Monitoring with Setpoint Alarming and Zero Speed Notification

  • Speed Monitoring with Setpoint Alarming and Rotor Acceleration Alarming

  • Speed Monitoring with Setpoint Alarming and Reverse Rotation Notification

The 3500/50-01-00-02 can also supply conditioned Keyphasor® signals to the backplane of the 3500 rack for use by other monitors, eliminating the need for a separate Keyphasor module. Additionally, it features a peak hold function that stores the highest speed, highest reverse speed, or number of reverse rotations the machine has reached, with the ability to reset these peak values.

Technical Specifications

Parameter Value
Product Model 3500/50-01-00-02
Manufacturer Bently Nevada (Baker Hughes)
Product Type Tachometer Module
Input Signal Range +10.0 V to -24.0 V
Input Impedance 20 kΩ (standard)
Power Consumption 5.8 Watts, typical
Transducer Supply 24 Vdc, 40 mA maximum per channel
Recorder Output +4 to +20 mA, proportional to module full-scale range (rpm or rpm/min)
Output Compliance 0 to +12 Vdc range across load
Load Resistance 0 to 600 Ω
Resolution 0.3662 µA per bit ±0.25% error at room temperature
Update Rate Approximately 100 ms
Operating Temperature –30°C to +65°C (–22°F to +150°F)
Storage Temperature –40°C to +85°C (–40°F to +185°F)
Relative Humidity 95% non-condensing
Weight Approximately 1.36 kg (3.0 lbs)
Compliance Standards CE Mark EMC Directives EN 61000-6-4

Key Features and Benefits

Dual-Channel Monitoring

The 3500/50-01-00-02 provides two independent channels for monitoring shaft speed, rotor acceleration, and direction. This dual-channel capability allows for comprehensive monitoring of machinery, enabling early detection of potential issues and facilitating predictive maintenance strategies.

Versatile Input Compatibility

Compatible with both proximity probes and magnetic pickups, the module offers flexibility in sensor selection, accommodating various industrial applications and ensuring reliable data acquisition.

Peak Hold Functionality

The peak hold feature captures and stores the highest speed, highest reverse speed, or number of reverse rotations achieved by the machine. This functionality aids in performance analysis and provides valuable insights into machine behavior over time.

Integrated Keyphasor® Signals

By supplying conditioned Keyphasor® signals to the 3500 rack’s backplane, the module eliminates the need for a separate Keyphasor module, simplifying system architecture and reducing equipment costs.

Robust Environmental Specifications

With an operating temperature range of –30°C to +65°C (–22°F to +150°F) and a storage temperature range of –40°C to +85°C (–40°F to +185°F), the 3500/50-01-00-02 is designed to withstand harsh industrial environments, ensuring reliable performance in demanding conditions.

Related Models

  • 3500/50-01-00-01 – Standard Tachometer Module without Keyphasor® output.

  • 3500/50-01-01-02 – Tachometer Module with internal terminations and CSA/NRTL/C approval.

  • 3500/50-01-02-02 – Tachometer Module with external terminations and ATEX/CSA Class 1, Zone 2 approval.

  • 3500/50-01-03-02 – Triple Modular Redundant (TMR) Tachometer Module with external terminations.

  • 3500/50-01-04-02 – Tachometer Module with internal barriers and internal terminations.

  • 3500/50-01-01-03 – Tachometer Module with internal terminations and reverse rotation monitoring.

  • 3500/50-01-02-03 – Tachometer Module with external terminations and zero speed notification.

  • 3500/50-01-03-03 – Triple Modular Redundant (TMR) Tachometer Module with reverse rotation monitoring.

  • 3500/50-01-04-03 – Tachometer Module with internal barriers and zero speed notification.

  • 3500/50-01-01-04 – Tachometer Module with internal terminations and rotor acceleration alarming.