Product Description

Overview

The Bently Nevada 133396-01 is a precision-engineered Overspeed Detection I/O Module designed for critical rotating machinery protection within the 3500/53 Electronic Overspeed Detection System. It delivers fast, redundant, and reliable overspeed monitoring for high-value assets such as steam turbines, gas turbines, and industrial compressors. Built to comply with API 670 and API 612, this module ensures operational safety under extreme industrial conditions.

Key Features

• Ultra-fast overspeed detection with response times under 10 ms

• Supports single-channel monitoring of shaft speed via proximity or magnetic pickup sensors

• Compatible with 2-out-of-2 and 2-out-of-3 voting logic for redundant protection

• Epoxy-sealed construction for resistance to humidity, dust, and corrosive environments

• Configurable thresholds and hysteresis to prevent false alarms from signal noise

• Provides 4–20 mA proportional output for DCS/PLC recording and monitoring

• Front-panel buffered transducer output for diagnostics without disrupting protection

• LED indicators for module status, communication, bypass, and alarm signals

• Power consumption of 8 W, with transducer supply of -24 Vdc at 40 mA maximum

Technical Specifications

Applications

• Overspeed protection of steam and gas turbines

• Safety monitoring for industrial compressors and high-speed machinery

• Integration with DCS/PLC systems for process monitoring

• Redundant safety systems requiring 2-out-of-3 voting logic

• Turbomachinery protection in power generation, oil & gas, and petrochemical plants

FAQ

Q: Can this module be used in a redundant configuration?
A: Yes, it supports 2-out-of-2 or 2-out-of-3 voting, ensuring reliable overspeed trip while avoiding false shutdowns.

Q: What is the response time for emergency shutdowns?
A: The 133396-01 reacts in under 10 milliseconds, providing ultra-fast protection for critical machinery.

Q: Is the module suitable for harsh industrial environments?
A: Yes, epoxy sealing protects against dust, moisture, and corrosive atmospheres, and it operates reliably from -30°C to +65°C.