Product Introduction: 3500/32M 149986-02
The 3500/32M 149986-02 is a specific hardware version of the Tachometer Module for the Bently Nevada 3500 Machinery Protection System. This module is a critical system component responsible for processing signals from one or two speed sensors (typically magnetic pickups or proximity probes) to provide a once-per-revolution (1X) Keyphasor® pulse and precise rotational speed (RPM) measurement. This speed and timing reference is fundamental for the operation of other monitoring modules within the 3500 rack, enabling functions like overspeed protection, startup/shutdown monitoring, and phase-sensitive vibration analysis.
Technical Parameters
The key technical specifications for the 3500/32M 149986-02 module are summarized in the table below.
| Parameter | Specification |
|---|---|
| Part Number | 3500/32M 149986-02 |
| System | Bently Nevada 3500 |
| Module Type | Tachometer Module (Dual-Channel) |
| Dimensions (H x W x D) | 190 mm x 55 mm x 120 mm (Standard 3500 Rack Slot) |
| Weight | 0.48 kg |
| Input Channels | 2 independent channels |
| Input Signal Type | Magnetic Pickup (MPU) or Proximity Probe |
| Input Signal Frequency Range | 0.5 Hz to 30,000 RPM |
| Keyphasor Signal Output | Provides a once-per-revolution digital pulse to all monitor modules in the rack |
| Speed Indication | Yes (via the 3500 framework software) |
| Overspeed Detection | User-configurable setpoint |
| Power Supply | Powered by the 3500 Rack; +24 VDC from the rack's power supply |
| Operating Temperature | -20°C to +65°C |
Application Scenarios
The 3500/32 Tachometer Module is indispensable in any application where rotational speed and a phase reference are critical for machinery protection and condition monitoring.
Overspeed Protection:
A primary safety function for steam turbines, gas turbines, and compressors, triggering an emergency shutdown if the rotor speed exceeds a predefined dangerous limit.
Startup and Shutdown Monitoring:
Provides critical speed data during machine coast-up and coast-down, allowing other monitoring modules to track vibration behavior through critical speeds and identify potential issues like rotor bows.
Phase Reference for Vibration Analysis:
The Keyphasor pulse it generates is essential for synchronizing vibration data, enabling the measurement of vibration phase angle. This is critical for diagnosing imbalance, misalignment, and other faults in turbines, compressors, and large pumps.
Performance Calculation:
Provides accurate RPM data for calculating compressor and pump performance curves in process industries like oil & gas and refining.
Sequential Control:
Used to initiate or inhibit certain machine functions (like opening auxiliary valves or starting lube oil pumps) based on specific speed thresholds during startup and shutdown sequences.
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7×24 hours technical consultation, from selection guidance to installation and commissioning to provide full life cycle service (paid)
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