3500/32 (125720-02) Monitoring System Module
Description:
The 3500/32, also known by the alternate part number 125720-02, is a Tachometer Module for the Bently Nevada 3500 Machinery Monitoring System. This module is a critical component designed to provide a reliable and accurate measurement of rotational speed (RPM) for machinery protection and control.
It is a dual-channel module that accepts input from various speed sensors, including magnetic pickups (MPUs) and proximity probes. The module processes these signals to determine the shaft speed. It provides multiple, configurable alarm setpoints (such as Danger and Alert) to protect against overspeed conditions, which are one of the most critical failure modes for any rotating asset. It also provides a buffered speed output for other systems.
Parameters & Specifications
The following table details the key parameters for this module.
| Parameter | Specification |
|---|---|
| Primary Part Number | 3500/32 |
| Alternate Part Number | 125720-02 |
| Module Type | Dual-Channel Tachometer Module |
| Compatibility | Bently Nevada 3500 Rack Frame |
| Slot Requirement | Single Slot |
| Typical Dimensions (H x W x D) | Approx. 193 mm x 27 mm x 170 mm (7.6 in x 1.06 in x 6.7 in) |
| Typical Weight | Approx. 0.4 kg (0.88 lbs) |
| Input Channels | 2 independent channels |
| Input Types | Magnetic Pickup (MPU), Proximitor (from a proximity probe) |
| Speed Range | From 0 RPM (standstill) to typically 30,000 RPM or higher. |
| Alarm Relays | Two per channel (Alert & Danger); Form C relay contacts. |
| Overspeed Detection | Yes, a primary function for machinery protection. |
| Power Supply | Powered by the 3500 system backplane. |
| Operating Temperature | -30°C to +65°C (-22°F to 149°F) |
| Key Outputs | RPM value to the framework, alarm relays, buffered sensor output. |
| Zero Speed Detection | Can detect when the shaft is not rotating. |
*Note: The exact dimensions and weight are approximate. For precise specifications and configuration details, always refer to the official Baker Hughes 3500/32 Tachometer Module Documentation.*
Application Scenarios
The 3500/32 Tachometer Module is a fundamental protection device used wherever knowledge and control of rotational speed are critical for operational safety and asset protection.
Overspeed Protection: This is the most critical application. The module continuously monitors shaft speed and will initiate an emergency shutdown (via the Danger relay) if the speed exceeds a pre-set limit, preventing catastrophic mechanical failure of turbines, compressors, and other high-speed machinery.
Speed-based Alarm and Control Functions: Provides "Alert" level warnings for high speed and can be used for other control logic, such as initiating valve sequences or managing auxiliary systems during startup and shutdown.
Zero Speed Indication: Used to confirm that a machine has come to a complete stop, which is a critical safety prerequisite for permitting maintenance.
Speed Reference for other Systems: The buffered output provides a clean, reliable speed signal to other devices, such as:
Turbine Control Systems
Programmable Logic Controllers (PLCs)
Vibration Analyzers (for order tracking)
Startup and Coast-down Monitoring: Provides the essential speed data required for plotting transient data (like Bode and Nyquist plots) during machine start-ups and shutdowns to analyze rotor dynamics.
Typical Machinery:
Steam Turbines & Gas Turbines
Centrifugal & Axial Compressors
Turbo-expanders
Large Pumps and Fans
Electric Motors and Generators
Any critical rotating machine where speed is a key process and protection variable.
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