The BENTLY 133388-01 (also known as the 3500/53 Electronic Overspeed Detection Module) is a high-reliability monitoring solution designed by Bently Nevada (now part of Siemens) for critical rotating machinery. It serves as a core component of the 3500 Machinery Protection System, specializing in overspeed detection and protection to safeguard equipment like steam turbines, compressors, and generators. Below is a comprehensive overview of its technical specifications, functional capabilities, and industrial applications.

Parameter	Specification
Model	133388-01 (3500/53-02-00)
Type	2-channel overspeed detection module
Input Types	Proximity probes (e.g., 3300 series) or magnetic pickups
Input Voltage Range	+10.0V to -24.0V DC
Output	4-20mA analog signals, 4 SPST relays
Power Supply	12–24V DC (derived from 3500 rack)
Accuracy	±0.02% of full scale (FS)
Frequency Response	0.0167 Hz–20 kHz
Resolution	0.1 RPM
Operating Temperature	-30°C to +65°C
Physical Dimensions	241.3 × 24.4 × 99.1 mm (9.5 × 0.96 × 3.9 in)
Weight	0.82 kg (1.8 lb)
Compliance	CSA/US Class I Division 2, ATEX Zone 2 (optional variants)

Redundant Voting System: Configurable as a 2-out-of-2 or 2-out-of-3 (recommended) voting system to ensure fail-safe operation, meeting API 670 and API 612 standards 8.

Trip Point Configuration: Adjustable overspeed trip points with rate-of-speed-rise (ROR) detection to prevent catastrophic failures in high-risk environments like power plants and refineries.

The BENTLY 133388-01 is a mission-critical overspeed detection module that ensures the safe operation of high-value rotating machinery. Its redundant design, multi-sensor compatibility, and seamless integration with the 3500 system make it ideal for industries where equipment failure could lead to catastrophic consequences. While third-party suppliers in Xiamen provide cost-effective solutions, Siemens’ global support network ensures long-term reliability. For detailed technical documentation or customized configurations, contact Siemens’ industrial support teams or visit their official resource library.

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