Product Description

The 3500/42M (Part Number 176449-02) is a high-reliability, 4-channel Proximitor Seismic Monitor designed for the Bently Nevada 3500 Machinery Protection System. This specific configuration, 3500/42-09-00, is an "Enhanced" monitor (M series) integrated with SIL2 functional safety certification. It is engineered to accept inputs from a wide array of transducers, including Proximitor* proximity probes, seismic velocity sensors, and accelerometers, providing continuous protection for critical rotating assets such as turbines, compressors, and high-pressure pumps.

What sets the 3500/42M-SIL2 apart is its compliance with IEC 61508 standards for functional safety. It doesn't just measure radial vibration, thrust position, and shaft dynamic signals; it does so with a mathematically proven level of reliability required for Safety Instrumented Systems (SIS). The module conditions these signals in real-time and compares them against user-programmable Alert and Danger setpoints. When paired with the 09 I/O module (featuring internal terminations), it supports Prox/Velom, Prox/Accel, and Velomitor configurations, ensuring flexible field wiring and reduced cabinet space requirements.

Technical Specifications

• Model Number: 3500/42M

• Order Code: 3500/42-09-00

• Main Module PN: 176449-02

• Manufacturer: Bently Nevada (Baker Hughes)

• Monitoring Channels: 4 Independent Channels

• Safety Rating: SIL2 Certified (IEC 61508)

• I/O Module Type: 09 (Prox/Velom with Internal Terminations)

• Measurement Types: Radial Vibration, Thrust Position, Shaft Absolute, Eccentricity, Velocity, Acceleration

• Frequency Response: 0.1 Hz to 10 kHz (Sensor dependent)

• Signal Conditioning: True RMS, Peak, and Peak-to-Peak detection

• Accuracy: ±1% of full-scale range

• Operating Temperature: -30 °C to +65 °C (-22 °F to +149 °F)

• Dimensions: 241.3 mm x 24.4 mm x 241.8 mm

• Shipping Weight: 2.0 kg

• Compliance: API 670, SIL2, CE, CSA, ATEX

Application & Safety Role

The 3500/42M 176449-02 is the standard choice for petrochemical plants, power stations, and LNG facilities where the machinery protection system must interface with a Safety Instrumented System (SIS). The SIL2 rating ensures that the probability of failure on demand is extremely low, protecting not only the equipment but the personnel and the environment. By using the 09 I/O option, engineers can connect various sensor types—including the high-temperature HTVS sensors—directly to the module’s internal terminal blocks without needing external termination panels.

Frequently Asked Questions

Can I use the 3500/42M in a non-SIL application?Yes. While the 176449-02 is SIL2 certified, it functions perfectly in standard machinery protection roles. It provides superior signal processing and diagnostic capabilities compared to legacy non-"M" modules.

What is the advantage of the internal termination (Option 09)?Internal termination allows for a cleaner installation within the 3500 rack. The field wiring from the sensors connects directly to the terminal blocks on the I/O module at the rear of the rack, simplifying maintenance and troubleshooting.