Introduction
The component with part number 3500/45-01-00 135137-01 is a specialized monitoring module within the Bently Nevada* 3500 Machinery Protection System. This part number refers to the 3500/45 Differential Expansion Monitor.
This module is specifically designed to monitor the relative axial growth between a machine's rotor and its stator (casing) during thermal changes, such as startup, shutdown, and load variations. It typically accepts signals from two Linear Variable Differential Transformers (LVDTs) or similar DC displacement transducers. By comparing these signals, it provides a precise measurement of the differential expansion, which is critical for preventing destructive internal rubbing between rotating and stationary parts.
*Bently Nevada is a part of Baker Hughes.
Parameters
The following table outlines the key technical parameters for the 3500/45-01-00 135137-01 monitor.
| Parameter | Specification |
|---|---|
| Part Number | 3500/45-01-00 135137-01 |
| Module Type | Differential Expansion Monitor |
| Compatibility | Bently Nevada 3500 Series Racks |
| Number of Channels | 1 (Typically requires two transducer inputs for a single differential measurement) |
| Input Signal | DC voltage from LVDTs or DC displacement transducers. |
| Transducer Power | Provides required power for the LVDTs. |
| Programmable Range | Configurable for various expansion ranges (e.g., ±20 mm, 0-50 mm). |
| Primary Function | Monitors the difference in thermal growth between the rotor and stator; provides programmable alarms (Alert and Danger). |
| Power Requirement | Powered directly from the 3500 rack backplane. |
| Communication | Integrates with the 3500 rack framework; status and values accessible via communication modules. |
| Dimensions (H x W x D) | Approx. 190 mm x 40 mm x 200 mm (7.5 in x 1.6 in x 7.9 in) *Standard 3500 Series full-size module slot.* |
| Weight | Approx. 0.45 kg (1.0 lb) |
Application Scenarios
The 3500/45 Differential Expansion Monitor is essential for protecting large machines where significant and differing thermal growth between the rotor and casing is expected. Key application scenarios include:
Steam Turbine Protection:
Critical for monitoring during the startup and shutdown of steam turbines. The rotor heats up and expands faster than the casing. The 3500/45 ensures this differential expansion remains within safe clearance limits to prevent blade-to-casing contact.
Gas Turbine Monitoring:
Used to monitor the differential expansion in gas turbines, protecting against rubs that could cause severe damage to blades, shrouds, and seals.
Prevention of Catastrophic Rubs:
By providing early warning (Alert) and ultimate shutdown (Danger) setpoints, this module initiates an alarm or trip sequence if the clearance between the rotor and stator becomes dangerously small, thereby avoiding a catastrophic machinery failure.
Startup and Shutdown Sequencing:
The data from this module is used by operators and engineers to manage the startup (warming) and cooldown periods of large turbines, ensuring thermal stresses are managed correctly and clearances are adequate before applying full load.
Condition and Clearance Trending:
The measured value is trended over time to understand the machine's thermal characteristics and to detect any long-term changes that might indicate issues such as casing distortion or fouling.
Typical Machinery Protected:
Large Steam Turbines (especially in power generation)
Heavy-Duty Gas Turbines
Some large centrifugal compressors with significant thermal transients.
Global direct procurement guarantee
All products are purchased directly from overseas original manufacturers or authorized channels, 100% guaranteed genuine quality, sufficient spot inventory, and comprehensive model coverage
Quality Commitment
Each product has been tested by our technicians, providing 12-month long warranty, worry-free after-sales
Flexible procurement plan
- Bulk order enjoys Friendship discount (2 pieces or more can be applied)
- Long-term cooperative customers can apply for priority supply
Full service support
7×24 hours technical consultation, from selection guidance to installation and commissioning to provide full life cycle service (paid)
Why do so many customers choose us?
On the basis of the same quality, we provide:
- More competitive price system
- Faster logistics response
- More complete technical support (free product technical documentation)
Your trust is the driving force for our continuous progress, submit your requirements immediately to get exclusive quotes
