Bently Nevada 200350-00-00-CN Accelerometer Piezoelectric Velocity Sensor

Product Overview

The 200350-00-00-CN is a rugged, general-purpose piezoelectric accelerometer designed for casing vibration measurements on critical rotating machinery. Within high-demand sectors such as power generation, oil and gas, and wastewater treatment, this sensor plays a critical role in monitoring high-frequency vibrations typically associated with gear mesh and rolling element bearing defects. By integrating this sensor into a Bently Nevada Trendmaster or similar Condition Monitoring System, engineers can identify subtle mechanical changes before they escalate into significant failures. This proactive data stream is essential for optimizing maintenance schedules, reducing unplanned outages, and extending the operational life of motors, pumps, and fans in harsh industrial environments.

Suffix Breakdown

The alphanumeric designation of the 200350-00-00-CN defines its mechanical interface and regional compliance:

• 200350: Base model for the 100 mV/g Accelerometer.

• -00 (Mounting Stud): Features a 1/4-28 Stainless Steel mounting stud equipped with a brass tip (0.5 inch length).

• -00 (Tolerance): Specifies a standard sensitivity of 100 mV/g with a plus or minus 20 percent tolerance.

• -CN (Agency Approvals): Mandatory China-specific approvals. The product is fully certified by NEPSI and carries the CCC (China Compulsory Certificate) for explosion-proof safety, adhering to GB 3836 standards for hazardous area use in the Chinese market.

Technical Specifications

Hardware Insights & FAQs

What are the specific advantages of the -CN version?

The -CN suffix denotes that the accelerometer is legally compliant with Chinese national standards. It has undergone the necessary certification processes by NEPSI to meet CCC requirements, ensuring it is safe and authorized for installation in hazardous industrial zones across China under the GB 3836 framework.

How does this accelerometer connect to monitoring systems?

The 200350 series typically utilizes a standard 2-pin MIL-style connector. It requires a constant current power source (ICP/IEPE compatible) to operate, which is usually provided by the monitoring rack or an interface module.

Can this sensor be used for low-frequency vibration?

While this accelerometer has a wide frequency range starting from 0.5 Hz, it is primarily optimized for high-frequency vibration detection. For very low-speed machinery (below 100 RPM), we recommend consulting Bently Nevada's low-frequency specific sensor catalog for better signal-to-noise ratios at low speeds.

Engineering & Installation Guide

Surface Preparation and Mounting Torque

For accurate high-frequency data, the mounting surface must be flat, smooth, and clean. Even minor surface irregularities can act as a low-pass filter, attenuating high-frequency signals. Use the 11/16 inch hex base to tighten the sensor. Apply a mounting torque of approximately 2.7 to 4.5 Nm (24 to 40 in-lb). Over-tightening can damage the internal piezoelectric element, while under-tightening leads to resonance errors.

China Ex/NEPSI Safety Protocols

To maintain the NEPSI/CCC explosion-proof integrity, always install this sensor with a certified intrinsic safety barrier if the environment is classified as hazardous. Use only approved, shielded cabling and ensure the cable armor is properly grounded at the system end to prevent electromagnetic interference (EMI) from corrupting the vibration signal.

Mounting Stud and Brass Tip

The 0.5 inch 1/4-28 SS stud with a brass tip (Option 00) provides a secure mechanical interface while the brass tip helps protect the machine surface from scarring. Ensure the stud is fully seated in both the sensor and the machine casing. For permanent installations, a light coating of silicone grease or acoustic coupling fluid between the sensor base and the machine surface can improve the frequency response at higher ranges.