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3500/94M

Bently Nevada 3500/94M
TMR Overspeed Protection Module

Key Features:
• SIL 3 Certified (2oo3 voting)
• 3-Channel Redundant Input
• 1-99,999 RPM Range

Critical Specs:
✓ ±0.01% Accuracy
✓ <15ms Response Time
✓ 4 Programmable Setpoints

Safety Functions:

Continuous MPU Health Monitoring

Broken Wire Detection

Fault-Tolerant Outputs

Certifications:
• API 670 Annex K
• TÜV SIL 3
• DNV-GL Marine

Applications:

Turbine Overspeed Protection

Nuclear Safety Systems

Mission-Critical Rotating Assets

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Bently Nevada 3500/94M
Triple Modular Redundant (TMR) Overspeed Protection Module

Key Specifications:
• Safety Integrity Level: SIL 3 (IEC 61508)
• Voting Logic: 2-out-of-3 (2oo3) architecture
• Input Channels: 3 independent MPU/tach inputs

Performance Parameters:
✓ Speed Range: 1-99,999 RPM
✓ Accuracy: ±0.01% of reading
✓ Response Time: <15ms
✓ Resolution: 0.1 RPM

Protection Functions:

Programmable overspeed setpoints (4 levels)

Zero speed detection

MPU signal quality monitoring

Broken wire detection

I/O Configuration:

Inputs:
• 3x Magnetic Pickup (MPU)
• Accepts 5-28V RMS signals

Outputs:
• 4x Isolated relay (5A @ 250VAC)
• 2x 4-20mA (fault-tolerant)
• RS-485 Modbus RTU

Certifications:
• API 670 5th Ed. (Annex K)
• TÜV Rheinland SIL 3
• DNV-GL Marine Type Approved
• IECEx/ATEX Zone 2

Environmental:

Operating Temp: -40°C to +70°C

Humidity: 5-95% non-condensing

MTBF: >250,000 hours

Applications:

Steam/Gas Turbine Overspeed Protection

Nuclear Reactor Coolant Pumps

Mission-Critical Compressors