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Phone: +86 16626708626Description
Key Technical Specifications
| Parameter | Specification Value |
| Channel Capacity | 4 continuous monitoring channels |
| Input Signal Types | Accelerometers, Velomitor sensors, velocity transducers |
| Keyphasor Inputs | Accepts up to 2 independent Keyphasor signals |
| Frequency Response | 4 Hz to 30,000 Hz (-3 dB direct acceleration) |
| Power Consumption | 7.7 W typical |
| Signal Integration | Non-integrated, single-integrated (velocity), double-integrated |
| Filter Options | Signal integration, 1X vibration tracking, band-pass filter |
| Buffered Outputs | 1 front-panel coaxial connector per channel (550 Ω output impedance) |
| Operating Temperature | −30 °C to +65 °C (−22 °F to +149 °F) |
| Dimensions (Main Module) | 241.3 mm x 24.4 mm x 241.8 mm (9.50 in x 0.96 in x 9.52 in) |
| Weight | 0.91 kg (2.0 lb) |
Product Introduction & Supply Chain Strategy
The Bently Nevada 3500/44M is a 4-channel aeroderivative gas turbine vibration monitor designed for critical machinery protection on GE LM, Rolls-Royce, and Pratt & Whitney turbines. It processes acceleration and velocity inputs, tracking 1X vibration amplitude and phase across varying machine operating modes to trip relays before mechanical failure occurs.
Maintaining this unit as a New Surplus buffer stock eliminates catastrophic supply chain delays during unplanned outages. Unlike worn parts with degraded capacitors, a genuine New Surplus 3500/44M guarantees OEM backplane pin integrity, zero thermal degradation, and a 10–15 year operational lifespan to keep total cost of ownership low.
Installation & Configuration Guide
Stage 1: Pre-Installation (Prep & Safety)
- Execute lockout/tagout procedures on the host turbomachinery controls.
- Put on an anti-static wrist strap connected to cabinet earth ground.
- Launch the 3500 Rack Configuration Software and backup the existing rack configuration file.
- Record DIP switch position settings, node addresses, and terminal block wiring on the rear I/O module.
Stage 2: Removal
- Unfasten the top and bottom captive screws on the existing 3500/44M main module.
- Pull the ejector levers outward simultaneously to unseat the card edge connectors from the 3500 backplane.
- Slide the card smoothly along the rack guide rails and immediately place it inside an ESD-shielded bag.
Stage 3: Installation (Clone & Seat)
- Verify the replacement 3500/44M module’s hardware revisions and DIP switches match the original unit.
- Align the module card edges with the designated rack slot guide channels.
- Press firmly on the center faceplate until the module seats into the backplane, then lock the upper and lower ejector handles and tighten captive screws.
Stage 4: Power-On & Testing
- Apply 24 V DC rack power and observe the front panel LEDs.
- Ensure the green OK LED stays solid and the TX/RX LED flashes green to indicate backplane communication.
- Connect a signal generator to the front buffered coaxial outputs to verify channel scaling and alarm setpoints before clearing the bypass logic.
- 3500/44M
- 3500/44M
Firmware/Software Versions & Upgrade Notes
- Recommended Firmware: Firmware Revision 1.20 or later (configured via 3500 Rack Configuration Software v5.0 or higher).
- Compatibility Notice: Ensure the 3500/44M firmware revision matches the installed rear I/O module type (e.g., Aero GT I/O, Prox/Velom I/O, or Multimode I/O). Mismatched firmware can cause transient system fault codes or incorrect Keyphasor tracking calculations.
- Upgrade/Downgrade Risk Warning: Avoid flashing firmware while the 3500 rack is actively monitoring live turbines. Firmware updates reset internal memory buffers, driving channel outputs to zero and tripping rack OK relays if the slot is not placed into software bypass.
Frequently Asked Questions (FAQ)
Is this Bently Nevada 3500/44M module genuinely new?
Yes. Every unit we stock is Brand New Surplus sourced from authorized distributor overstock and cancelled capital projects. The modules sit in original anti-static packaging, feature zero backplane pin insertion marks, and undergo thorough inspection before dispatch.
Why is New Surplus priced higher than salvaged cards on the market?
New Surplus units offer guaranteed original component longevity and OEM-grade reliability without thermal degradation or dried electrolyte capacitors. Spending 20% more for a unused card avoids tens of thousands of dollars in emergency plant shutdown costs caused by unverified pull-outs.
Can I hot-swap the 3500/44M module while the turbine is running?
While the Bently Nevada 3500 rack backplane supports live card replacement, you must place the specific monitor channel into Bypass Mode in software prior to extraction. Pulling an active card without bypass will break trip-logic loops and trigger an immediate fail-safe trip on your turbine protection system.
Does replacing this module require re-downloading the rack logic?
Yes. Although hardware parameters are stored in the 3500 System Monitor (3500/22M), you must connect via the 3500 Rack Configuration Software to confirm channel allocation, sensor scale factors, and alarm setpoints for the new 3500/44M module.
Is the 3500/44M compatible with standard proximity probes?
The 3500/44M is specifically configured for aeroderivative gas turbine sensors, interfacing primarily with accelerometers, Velomitor sensors, and velocity transducers through interface modules like 86517 and 86497. For standard eddy current proximity probes, use the 3500/42M Proximitor Monitor instead.
What warranty coverage comes with this New Surplus card?
We provide a comprehensive 1-year warranty on all New Surplus Bently Nevada hardware. Each module includes a verified serial number and full functional QC test report.
