Description

Bently Nevada 3500/50 133388-02

Bently Nevada 3500/50 133388-02 is a tachometer module belonging to the 3500 Series Machinery Health Monitoring System, serving as a core component for speed monitoring and condition protection of industrial rotating machinery. Designed for harsh industrial environments with advanced sensor technology and signal processing algorithms, it features high-precision speed measurement, fast response, and multifunctional alarms. It is mainly used to monitor the rotational speed, rate of speed change, and reverse rotation of rotating machinery in real time, providing reliable data support for the safe and stable operation of equipment. Widely applied in key industrial sectors including power generation, oil and gas, chemical processing, and metallurgy, it fully complies with Bently Nevada’s stringent quality standards and technical specifications for industrial monitoring products.

1 Product Positioning and System Compatibility

1.1 Core Positioning

1.2 System Compatibility

• Programmable configuration via 3500 Framework software for flexible monitoring modes;
• Provides conditioned keyphasor signals to the 3500 rack backplane for use by other monitors in the system, eliminating the need for a separate keyphasor module and simplifying system architecture;
• Supports multiple communication protocols and seamless integration with Distributed Control Systems (DCS), adapting to existing industrial control infrastructure for data exchange and remote monitoring.

1.3 Environmental and Physical Characteristics

Environmental Adaptability

• Operating temperature: -25°C to +70°C, suitable for extreme temperature industrial environments;
• Storage temperature: -40°C to +85°C, convenient for spare parts storage and transportation;
• Relative humidity: compatible with standard industrial environments;
• Ingress protection: IP67, preventing dust and water splashing, suitable for outdoor and harsh on-site installation.

Physical Specifications

2 Functions and Technical Advantages

2.1 Core Functions

High-Precision Speed Monitoring

Multifunctional Alarm and Condition Monitoring

It provides comprehensive alarm functions including overspeed, underspeed, and reverse rotation alarms. Alarm thresholds can be flexibly configured based on on-site requirements. When speed exceeds the set range or reverse rotation occurs, it immediately issues an alarm to help operators quickly identify faults and prevent equipment damage. It also features a peak-hold function that records the maximum forward speed, maximum reverse speed, and number of reverse rotation events, with user-resettable peaks, facilitating documentation of extreme operating conditions and supporting equipment performance analysis and maintenance.

Signal Processing and Transmission

It supports multiple input signal types including speed pulses, TTL, sine waves, and gear tooth waveforms, flexibly adapting to different sensor inputs. Equipped with signal conditioning, it filters and amplifies input signals to ensure accurate transmission. Outputs include analog (4–20 mA) and digital (RS‑485) signals, along with communication interfaces such as RS‑232 and CAN, enabling real-time transmission of speed data to a central control system for continuous monitoring and data traceability.

System Integration and Configuration

1. Speed monitoring with setpoint alarm and speed band alarm;
2. Speed monitoring with setpoint alarm and zero-speed indication;
3. Speed monitoring with setpoint alarm and rotor acceleration alarm.

2.2 Technical Advantages

3 Typical Applications

3.1 Power Generation Industry

Widely used in power facilities including thermal power plants, hydropower stations, and gas turbine power plants to monitor the speed of rotating machinery such as steam turbines, generators, and fans. Real-time speed monitoring detects overspeed, underspeed, and other anomalies, triggering alarms to prevent damage to generation units and ensure safe, stable, and efficient power production. It also provides accurate speed data for predictive maintenance, reducing operational costs.

3.2 Oil and Gas Industry

Deployed in oil and gas production, transmission, and processing facilities to monitor the speed of compressors, pumps, fans, and other rotating equipment in harsh environments including high temperature, high pressure, high humidity, and flammable/explosive atmospheres. Precise speed monitoring identifies abnormal operation early to prevent failures and maintain continuous production. Remote monitoring capability allows maintenance staff to oversee equipment status in real time, improving operational efficiency.

3.3 Chemical and Pharmaceutical Industry

Used for speed monitoring of critical automated equipment in chemical and pharmaceutical production, such as reactors, agitators, and transfer pumps. Real-time speed control ensures stable operation within set parameters, preserving process consistency and product quality. Alarm functions promptly indicate equipment faults, avoiding production interruptions and safety hazards.

3.4 Other Industrial Sectors

4 Technical Specifications