3500/22M (138607-01) Monitoring System Module
Description:
The 3500/22M, also known by the alternate part number 138607-01, is a TMR (Triple Modular Redundant) Velocity/4-20 mA Input Module for the Bently Nevada 3500 Machinery Monitoring System. This module is a high-integrity, fault-tolerant version of the standard 3500/22 module, designed for critical applications where a single component failure must not compromise the monitoring system's availability or safety.
It features a dual-channel design where each channel can be independently configured to accept either a signal from a velocity seismic transducer (for casing vibration) or a 4-20 mA analog input (for process variables like temperature or pressure). The "TMR" architecture means that each input signal is processed by three separate and isolated circuits. This design ensures continued operation and prevents false alarms or trips in the event of a single internal failure, making it suitable for Safety Instrumented Systems (SIS).
Parameters & Specifications
The following table details the key parameters for this module.
| Parameter | Specification |
|---|---|
| Primary Part Number | 3500/22M |
| Alternate Part Number | 138607-01 |
| Module Type | TMR Dual-Channel Velocity / 4-20 mA Input Module |
| Compatibility | Bently Nevada 3500 Rack Frame (requires a TMR rack) |
| 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, configurable channels |
| Velocity Input | Accepts signals from velocity transducers (e.g., 100 mV/in/sec). Provides power for ICP®/IEPE type sensors. |
| 4-20 mA Input | Accepts standard 4-20 mA analog signals. Can be scaled to engineering units (e.g., PSI, °C). |
| TMR Architecture | Yes. Three independent logic paths per channel for fault-tolerant operation. |
| Power Supply | Powered by the 3500 system backplane. Requires power from all three power supplies in a TMR rack for full redundancy. |
| Operating Temperature | -30°C to +65°C (-22°F to 149°F) |
| Safety Certification | Designed to meet safety standards like IEC 61508 for use in Safety Instrumented Systems (SIS). |
| Primary Function | To provide highly reliable, fault-tolerant monitoring of casing vibration and process parameters. |
*Note: The exact dimensions and weight are approximate. For critical safety system design, always consult the official Baker Hughes 3500/22M TMR Module Documentation.*
Application Scenarios
The 3500/22M TMR Module is deployed in the most critical scenarios where monitoring of casing vibration or process parameters is essential for safety and availability, and where the monitoring system itself must not be a single point of failure.
Critical Casing Vibration Monitoring in SIS: Used as the primary input for casing vibration "Danger" alarms on turbines, compressors, and pumps where the function is part of a Safety Instrumented System (SIS) with a required Safety Integrity Level (SIL 2 or SIL 3).
Redundant Process Parameter Monitoring: Used to monitor vital process variables that are used for machine protection, such as:
Bearing Temperature TTY (Trip-Temperature) signals
Lube Oil Pressure
Seal Gas Differential Pressure
Ensuring that a failure in the monitoring module does not cause a spurious shutdown due to a bad measurement.Fault-Tolerant Applications on Turbomachinery: Essential for protecting critical equipment where the continuous availability of the monitoring channel is paramount, and a single module failure must not lead to a process unit trip.
Machinery Protection on Offshore Platforms & Unmanned Facilities: Ideal for remote or difficult-to-access locations where system reliability is crucial, and false trips have significant operational and financial impacts.
High-Availability Systems in Power Generation: Used in combined cycle gas turbines and other power plants where maximizing uptime is a key objective, and the protection system must be exceptionally reliable.
Typical Machinery:
Gas Turbines (for power generation and mechanical drive)
Steam Turbines
Centrifugal & Axial Compressors in critical process trains
Main Boiler Feed Pumps
Any machinery where the vibration or process monitoring function is required to have high availability or SIL certification.
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