Description
Product Introduction & Engineering Value
Aeroderivative gas turbines operate at high rotational speeds where even a small increase in vibration can quickly develop into a forced outage. The BENTLY 3500/44M is engineered specifically for these machines, providing continuous vibration surveillance and configurable protection logic.
Unlike general-purpose vibration monitors, the 3500/44M includes filtering functions tailored for gas turbine applications, including signal integration, 1X vibration tracking, and band-pass analysis. It integrates directly into the BENTLY Nevada 3500 platform and supplies operators with both machinery protection and diagnostic information.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | BENTLY Nevada |
| Model | 3500/44M |
| Product Type | Aeroderivative GT Vibration Monitor |
| Series | 3500 Machinery Protection System |
| Monitoring Channels | 4 |
| Supported Sensors | Velomitor®, accelerometers, compatible Prox/Velom I/O modules |
| Keyphasor Inputs | Dual Keyphasor support |
| Filter Functions | Signal Integration, 1X Tracking, Band-Pass Vibration |
| Configuration Software | 3500 Rack Configuration Software |
| Alarm Functions | User-programmable Alert and Danger setpoints |
| Typical Power Consumption | Approximately 7.7 W |
| Primary Application | Aeroderivative gas turbine protection and condition monitoring |
Field Application & The “Trench” Experience
During a scheduled outage at a combined-cycle power station, maintenance personnel replaced vibration sensors on an LM6000 gas turbine. Commissioning revealed inconsistent 1X vibration values during acceleration. Sensor wiring and calibration checked out, but the existing monitor had developed intermittent tracking instability after years of continuous service.
Installing a verified 3500/44M restored stable vibration tracking throughout the startup sequence. Following overspeed and load acceptance tests, the unit returned to commercial operation without additional adjustments.
Typical applications include:
- GE LM2500 gas turbine vibration monitoring
- Rolls-Royce RB211 aeroderivative turbine protection
- Industrial power generation package vibration monitoring
3500/44M
3500/44M
Transparency SOP: QA & Testing
Every New Surplus or professionally refurbished 3500/44M undergoes documented quality verification before shipment.
- PCB inspection for contamination, overheating, and solder integrity
- Connector and backplane interface examination
- Installation verification in a compatible 3500 test rack
- Four-channel functional testing using calibrated vibration signal simulators
- Alarm response verification under multiple operating modes
- Burn-in observation to identify intermittent electronic faults
- Anti-static packaging with serial number traceability
The Veteran’s Tech Trap Guide
⚠️ Don’t substitute a 3500/42M for a 3500/44M. Although both occupy similar rack positions, the 3500/44M includes gas turbine-specific filtering and monitoring functions that are not available on the standard Proximitor/Seismic Monitor.
⚠️ Verify the interface modules. Velocity transducers require the appropriate BENTLY interface modules. Incorrect interface hardware can produce invalid vibration measurements even when the monitor is functioning normally.
PRO TIP: Save the existing rack configuration before replacing the monitor. Restoring validated alarm settings and tracking filter parameters can reduce commissioning time and help avoid unnecessary turbine trips after startup.
Dynamic FAQ
Q1. What is the primary purpose of the 3500/44M?
The 3500/44M is a four-channel vibration monitor developed specifically for aeroderivative gas turbines, providing continuous machinery protection and diagnostic monitoring.
Q2. Which filter options are available?
The monitor supports Signal Integration, 1X Vibration Tracking, and Band-Pass Vibration filtering, allowing users to tailor measurements to gas turbine operating conditions.
Q3. Does the 3500/44M support Keyphasor signals?
Yes. It accepts two independent Keyphasor inputs, enabling each pair of monitoring channels to use different tracking filter configurations when required.
Q4. Is the module suitable for Triple Modular Redundant (TMR) systems?
Yes. The 3500/44M supports TMR architectures when installed according to BENTLY Nevada system design guidelines.
Q5. How is New Surplus inventory verified?
Each module is inspected for part number authenticity, cosmetic condition, connector integrity, and functional operation before shipment. Refurbished units additionally undergo documented electrical and operational testing.
Q6. Is warranty available?
Yes. Warranty coverage depends on inventory condition. Both New Surplus and professionally refurbished modules are typically supplied with a limited warranty against defects in materials and workmanship.
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