Product details
Product Overview
- Brand: Bently Nevada
- Model: 3500/50M-01-01
- Series: 3500 Machinery Protection System
- Type: Tachometer Monitoring Module
- Designed for precise shaft speed and rotor acceleration measurement
- Supports proximity probes and magnetic pickup sensors
- Handles dual channel speed inputs in one module
- Built for critical rotating equipment protection
- Made in U.S.A with industrial grade reliability
- Product page:
3500/50M Series Modules
Configuration Breakdown
- Order Code: 3500/50M-01-01
- ├─ 3500/50M = Tachometer monitor module
- ├─ 01 = I/O module with internal terminations
- └─ 01 = cNRTLus Class I Division 2 approval
Core Functions and Diagnostic Ability
- Measures shaft speed with high repeat accuracy
- Tracks rotor acceleration and zero speed events
- Supports 1 to 255 events per revolution
- Detects overspeed and underspeed conditions
- Provides real time rack communication status
- Front LEDs show OK, TX/RX, and bypass state
- Internal signal limiting protects module circuits
- Works in continuous monitoring environments
Technical Data
- Brand: Bently Nevada
- Model: 3500/50M-01-01
- Module Power Use: 5.8 W typical
- Sensor Supply: 24 Vdc, 40 mA max per channel
- Input Signal Range: +10 V to −24 V
- Input Impedance: 20 kΩ standard
- Input impedance TMR version 40 kΩ
- Internal barrier version 7.15 kΩ
- Max Input Frequency: 20 kHz
- Min Frequency Prox Probe: 0.0167 Hz
- Min Frequency Magnetic Pickup: 3.3 Hz
- Full Scale Speed: up to 99,999 rpm
- Speed Accuracy: ±0.1 rpm below 100 rpm
- Accuracy ±1 rpm from 100 to 10,000 rpm
- Accuracy ±0.01% above 10,000 rpm
- Acceleration Accuracy: ±20 rpm per minute
- Resolution: Event based speed calculation
- Linearity: Factory calibrated for tach signals
- Noise Immunity: Internal signal conditioning
- Interference Protection: Built in limiting and filtering
- Environment Tolerance: Industrial rack system use
Mechanical and Rack Data
- Monitor module uses one full height front slot
- I/O module uses one full height rear slot
- Main board size 241.3 × 24.4 × 241.8 mm
- Main board weight about 0.82 kg
- Non barrier I/O depth 99.1 mm
- Internal barrier I/O depth 163.1 mm
Compatibility Requirements
- Works only inside 3500 rack systems
- Not compatible with 3500/20 modules
- Required firmware for 3500/22M revision 1.70 or later
- 3500/01 software version 4.20 or later
- 3500/02 software version 2.52 or later
- 3500/03 display version 1.52 or later
- 3500/50M firmware 5.30 or later
- Series link:
3500/50M modules
Installation Guide
- Install into one free full height front slot
- Mount matching I/O module at rear slot
- Connect proximity probe or magnetic pickup wiring
- Check channel event per revolution setting
- Verify rack firmware before power up
- Confirm LED OK status after startup
Commissioning and Maintenance
- Configure channels using 3500 configuration software
- Set events per revolution correctly
- Check TX/RX LED for rack communication
- Use bypass mode during service work
- Hot swap supported in many rack setups
- Low routine maintenance needed
Certifications and Compliance
- Agency Approval: cNRTLus
- Rated for Class I Division 2 areas
- Designed for hazardous locations
Typical Application Scenarios
- Steam and gas turbines
- Compressors and expanders
- High speed motors
- Critical pump trains
- Generator sets
- Test stands for rotating machines
Packing List
- 1 × 3500/50M-01-01 Tachometer Module
- 1 × Matching I/O module
- Factory inspection label
- Protective packaging
Warranty and Shipping
- Warranty: 12 months
- Global delivery available
- Courier options FedEx, UPS, DHL
- Tracking number provided after dispatch
FAQ
- Can this module read two sensors at once
- Yes. It accepts two independent tachometer inputs.
- Does it work with magnetic pickups
- Yes. Passive magnetic pickups are supported.
- What happens if signal voltage is too high
- The module limits excessive input internally.
- Can I use it with older 3500 racks
- Check firmware and software versions first.
- Is it good for low speed shafts
- Yes. It measures down to very low frequency.
- Field tip for stable readings
- Use shielded cable and correct grounding.
Selection Guidance
- Confirm your rack firmware version first
- Check sensor type and output level
- Choose correct I/O barrier option
- Verify hazardous area certification needs
- Match events per revolution with gear teeth
- Ask for help if speed range is unknown
Contact
- Email:
sales@powergearx.com - WhatsApp:
+86 18030005825 - More models:
3500/50M product family
Original Source: https://www.powergearx.com/
Partner: PLCDCS HUB Limited
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Michael Turner –
We installed the Bently Nevada 3500/50M-01-01 tachometer module in a gas turbine monitoring system, and the performance has been outstanding. The unit arrived brand new, factory sealed, and fully tested. PowerGearX handled the order professionally, with quick confirmation and same-week shipping to our Texas facility. Installation was straightforward, and the module integrated seamlessly with our existing 3500 rack. Speed readings are stable and precise, which is critical for protecting high-speed rotating assets. This module has already helped us identify abnormal speed fluctuations during startup. Excellent product quality and a supplier that clearly understands industrial reliability requirements. Highly recommended for anyone running critical machinery.