BENTLY NEVADA 3500/50 Tachometer Module | Replacement, Equivalent & Selection Guide
The Bently Nevada 3500/50 Tachometer Module is a precision speed-measurement card designed for the 3500 Series Machinery Protection System. It accepts signals from magnetic pickups and proximity probes to deliver accurate rotational speed (RPM) and overspeed trip protection for rotating machinery in critical industrial environments.
Technical Specifications
- Part Number: 3500/50
- Manufacturer: Bently Nevada (Baker Hughes)
- Module Type: Tachometer / Speed Monitor
- Rack Compatibility: Bently Nevada 3500 Series Rack
- Input Signal: Magnetic pickup (passive) or proximity probe (active)
- Speed Range: 1 – 99,999 RPM
- Channels: 2 (dual-channel speed measurement)
- Overspeed Trip: Configurable hardware and software trip setpoints
- Output: 4–20 mA analog, relay contacts, Keyphasor® reference
- Communication: Compatible with 3500 System TDI / Modbus
- Power Supply: Supplied via 3500 rack backplane
- Operating Temperature: 0°C to +65°C
- Certifications: CE, SIL 2 capable (system-level)
- Weight: Approx. 800 g
Compatible Replacement & Equivalent Models
The following models are commonly evaluated as replacements or functional equivalents for the 3500/50. Compatibility depends on rack configuration, firmware version, and application requirements — always verify before substitution.
- 3500/50M – Enhanced version with additional memory and extended diagnostics; direct drop-in for most 3500 racks
- 3500/53 – Overspeed Detection Module; used when dedicated overspeed trip logic is required separately from speed measurement
- 3500/25 – Keyphasor® Module; provides phase reference signal often used alongside the 3500/50
- 3500/15 – I/O Module; may be required as a companion card depending on wiring configuration
- Emerson 3500/50-01-00 – OEM variant with specific ordering suffix; functionally equivalent
- Third-party equivalents – Some integrators offer 3500-compatible tachometer cards; confirm signal compatibility, rack slot type, and firmware handshake before deployment
Why Choose the Original Model
- Proven reliability in API 670-compliant machinery protection systems
- Full Bently Nevada ecosystem integration — seamless with System 1 software, TDI, and 3500 rack diagnostics
- Factory-calibrated for precise speed measurement with minimal drift
- OEM firmware support — eligible for Bently Nevada firmware updates and technical bulletins
- Traceability — original modules carry full manufacturing traceability for regulated industries (oil & gas, power generation)
Typical Applications
- Steam and gas turbine overspeed protection
- Compressor train speed monitoring
- Pump and motor RPM measurement in critical service
- Gearbox speed ratio verification
- Keyphasor® phase reference for vibration analysis
- Petrochemical, LNG, power generation, and offshore platforms
System Compatibility
- Rack: Bently Nevada 3500 Series (standard and TMR configurations)
- Software: System 1 Evolution, System 1 Classic, Rack Configuration Software (RCS)
- Probes: 3300 XL 8mm, 3300 5mm, 330900 series proximity probes; passive magnetic pickups
- DCS Integration: Modbus RTU/TCP, 4–20 mA hardwired output to DCS/SCADA
- Safety Systems: Compatible with SIL 2 safety instrumented systems when configured per Bently Nevada SIL documentation
Selection Guide
Use the following criteria to determine whether the 3500/50 is the correct module for your application:
- Speed range needed: If < 99,999 RPM with standard probe input → 3500/50 is suitable
- Overspeed trip required: If dedicated hardware overspeed trip is mandatory → consider pairing with 3500/53
- Keyphasor® reference needed: If phase reference for vibration analysis is required → add 3500/25
- Rack slot availability: Confirm available slot type (standard vs. enhanced) before ordering
- Firmware version: Verify rack firmware compatibility with your System 1 software version
- Redundancy requirement: For TMR (Triple Modular Redundancy) racks, confirm 3500/50 TMR variant availability
- Probe type: Passive magnetic pickup vs. active proximity probe — both supported, but wiring and termination differ
Quality Assurance & Sourcing
- All units sourced through verified industrial automation distributors and authorized resellers
- Pre-shipment inspection: visual, functional power-on test, and label/serial verification
- Refurbished units (where applicable) are clearly labeled and include refurbishment documentation
- New-surplus and factory-new units available — specify requirement at time of inquiry
- Traceability documentation available upon request for regulated industries
- Packaging: anti-static ESD bag, foam-lined carton, humidity indicator card
How to Order
- Step 1: Confirm your rack model and available slot type
- Step 2: Specify condition requirement: New / New-Surplus / Refurbished
- Step 3: Provide your shipping destination for lead time and freight quote
- Step 4: Submit inquiry via [email protected] or add to cart and checkout
- Step 5: Receive order confirmation with estimated delivery and tracking
For urgent requirements or bulk orders, contact us directly at +0086 19859288691.
Replacement & Compatibility FAQ
Q: Can the 3500/50M replace the 3500/50 directly?
A: In most cases yes — the 3500/50M is backward-compatible with standard 3500 racks. Verify firmware version and slot type before installation.
Q: Is the 3500/50 compatible with third-party proximity probes?
A: The module is designed for Bently Nevada probes, but many third-party probes with equivalent output characteristics (e.g., -24V bias, 200 mV/mil sensitivity) are compatible. Confirm probe specifications before use.
Q: What is the lead time for a new 3500/50?
A: New-surplus units typically ship within 3–7 business days. Factory-new units may require 4–12 weeks depending on OEM availability. Contact us for current stock status.
Q: Can I use the 3500/50 in a TMR rack?
A: Only if the TMR-specific variant is used. Standard 3500/50 modules are not interchangeable with TMR slot configurations without verification.
Q: Do you provide calibration certificates?
A: Calibration certificates are available for new and refurbished units upon request. Please specify at time of order.
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