

Yokogawa 3500/61 133811-02 - Dual-Channel Displacement / Velocity Transmitter
Description:
The Yokogawa 3500/61 133811-02 is a Dual-Channel Displacement and Velocity Transmitter module for the Yokogawa 3500 Machinery Management System. This module is designed to condition and monitor signals from proximity probes (for displacement) and velocity seismometers (for casing vibration). Its primary function is to convert these dynamic signals into stable 4-20 mA analog outputs, which represent the overall vibration or displacement levels. This allows the critical machinery data to be easily transmitted to and displayed on a plant's Distributed Control System (DCS) or Programmable Logic Controller (PLC). It serves as a vital interface between the high-fidelity protection of the 3500 system and the plant's broader control and monitoring network.
Specifications / Parameters
| Parameter | Specification |
|---|---|
| Model / Part Number | 3500/61 133811-02 |
| Product Type | Dual-Channel Displacement / Velocity Transmitter |
| Rack Compatibility | Yokogawa 3500 Series Rack |
| Number of Channels | 2 independent channels |
| Input Types | • Displacement: Eddy Current Proximity Probes (for shaft vibration, position) • Velocity: Velocity Seismometers (for casing/bearing absolute vibration) |
| Primary Output | Two independent, channel-isolated 4-20 mA analog outputs. |
| Output Scaling | Linearly proportional to the measured vibration (µm, mils) or velocity (mm/s, in/s). |
| Transducer Power | Provides the required power for eddy current proximity probes. |
| Module Slots | Occupies a single slot in a 3500 series rack. |
| Dimensions (H x W) | Standard 3500 Module Size: Approximately 132 mm (H) x 62 mm (W) |
| Depth | Varies with rack and connector. |
| Weight | Approximately 0.45 kg (1.0 lb) |
*Note: For mission-critical applications, always verify dimensions, weight, and technical specifications against the latest official Yokogawa 3500/61 data sheet or manual.*
Application Scenarios
The 3500/61 module is used to integrate machinery vibration data into plant-wide control systems for operational monitoring and basic alarming. Its key application scenarios include:
DCS/PLC Integration for Operational Monitoring:
Provides a standardized 4-20 mA signal to the plant's DCS, allowing control room operators to view real-time vibration levels of critical and auxiliary machinery directly on their main control screens alongside process parameters.
Auxiliary Equipment Monitoring:
Ideal for monitoring important but non-critical machinery (e.g., pumps, fans, motors) where a full dedicated protection channel is not justified, but operational visibility is still required for condition-based maintenance.
Redundant Data Path for Critical Machinery:
Offers a secondary, independent output for key vibration points on critical machines like turbines and compressors. While the 3500 system itself handles the primary protection, the 3500/61 provides a hardwired analog signal to the DCS as a backup data source or for historical trending.
Plant-Wide Historical Data Logging:
Feeds continuous vibration data into the plant's historian system through the DCS, enabling long-term trend analysis, performance monitoring, and support for predictive maintenance programs.
General Purpose Vibration Monitoring in Process Plants:
Used extensively in industries such as Oil & Gas, Chemical, and Power Generation to bring a wide array of machinery health data into the central control room, improving overall asset management and operational awareness.
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