Product Introduction: 3500/72M 140734-08
The 3500/72M 140734-08 is a TMR (Triple Modular Redundant) Relay Module for the Bently Nevada 3500 Machinery Protection System. This module is a critical safety component designed to provide the highest level of reliability for machinery shutdown functions. It incorporates three independent voting circuits per channel that monitor the system and actuate shutdown relays. The "TMR" architecture ensures that a single failure within the module itself does not cause a spurious (false) trip of the machinery, while still guaranteeing a trip if a genuine dangerous condition occurs. It is the preferred choice for applications where maximizing asset availability and preventing unnecessary downtime are paramount.
Technical Parameters
The key technical parameters for the 3500/72M 140734-08 module are summarized in the table below.
| Parameter Category | Specification |
|---|---|
| Model & Part Number | 3500/72M 140734-08 |
| Module Type | TMR (Triple Modular Redundant) Relay |
| Number of Channels | 4 independent TMR relay channels |
| Relay Contacts | Form-C (SPDT - Single Pole, Double Throw) for each channel. |
| Contact Rating | Typically 2 Amps @ 30 VDC / 0.5 Amps @ 120 VAC (resistive). |
| Trip Logic | 2-out-of-3 (2oo3) voting per channel for high fault tolerance. |
| Safety Certification | Designed to meet IEC 61508 SIL 2 / SIL 3 requirements. |
| Module Dimensions (H x W x D) | Approx. 190 mm x 60 mm x 140 mm (7.5 in x 2.4 in x 5.5 in) [Standard 3500 rack slot] |
| Module Weight | Approx. 0.9 kg (2.0 lbs) |
| Mounting | Slides into a single slot in a 3500 series rack. |
| Power Requirement | Powered by the 3500 rack backplane. Redundant power supply inputs. |
| Operating Temperature | 0°C to +65°C (+32°F to 149°F) |
| Key Features | • Prevents spurious trips • Ensures trip on demand • Relay status indicators • Hot-swappable (in a redundant configuration) |
Note: The dimensions and weight are standard for a module in a 3500 series frame. Always verify the specific contact ratings and safety certifications in the official product manual for your application.
Application Scenarios
The 3500/72M TMR Relay Module is deployed in the most critical applications where both safety and operational availability are essential. Its primary application is to execute the final shutdown command for machinery.
Critical Turbomachinery Protection: Acting as the final shutdown relay for gas turbines, steam turbines, and large compressors in power plants and oil & gas facilities.
Safety Instrumented Systems (SIS): Serving as the logic solver or final element in safety loops for process industries (e.g., chemical, petrochemical).
High-Availability Applications: Any process where a false trip results in extremely high production losses or operational risks.
Machinery Requiring SIL Rating: Systems that need to comply with Safety Integrity Level (SIL) 2 or SIL 3 standards as per IEC 61508/61511.
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