200157-21-05 | Bently Nevada 10.2 mV/(m/s²) Enveloping Trendmaster Pro Accelerometer

What Happens When Bearing Health Demands Precision Monitoring?

When roller element bearings begin to fail, early detection is critical to avoid costly downtime. The 200157-21-05 from Bently Nevada provides the accurate vibration data you need. This Enveloping Trendmaster Pro Accelerometer is designed for demanding industrial environments. It captures subtle signals that indicate cavitation or bearing wear. With this data, maintenance teams can act before catastrophic failure occurs.

Key Features & Technical Specs of the 200157-21-05

• Sensitivity: 10.2 mV/(m/s²) (100 mV/g) at 80 Hz, ±12%.
• Measurement Range: ±245 m/s² (±25 g) for the accelerometer.
• Frequency Range: 10 to 10,000 Hz (600 to 600,000 cpm), referenced to 80 Hz.
• Mounted Resonant Frequency: >20 kHz (>1200 kcpm).
• Amplitude Linearity: ±2% (1 to 10 g pk).
• Transverse Sensitivity: ≤7%.
• Settling Time: ≤300 ms (within 5% of bias).
• Excitation Voltage: 4.7 to 5.5 Vdc.
• Output Bias Voltage: +2.5 ± 0.23 Vdc.
• Quiescent Current: <800 µA.

One standout spec is the mounted resonant frequency above 20 kHz. This ensures the accelerometer captures high-frequency vibrations from bearing defects without distortion. It makes the 200157-21-05 ideal for early fault detection in rotating machinery.

Applications & Use Cases

The 200157-21-05 excels in roller element bearing monitoring and detecting cavitation effects. For example, in a pump system, it can identify subtle vibration changes that precede bearing failure. This allows for planned maintenance rather than emergency shutdowns. Its wide frequency range covers both low-speed and high-speed machinery. The accelerometer's robust design suits continuous operation in harsh industrial settings.

Installation & Setup

Mount the 200157-21-05 using the 3/8-24 female thread. Apply a mounting torque between 2.7 to 6.8 N·m (2 to 5 ft·lbf). Ensure the mounting surface is clean and flat for optimal coupling. The stud option (21) includes a 3/8-24 outer diameter to M6x1 inner diameter hex plate stud. Allow up to 24 hours cure time if adhesive mounting is used. Always follow the manufacturer's manual for wiring and configuration.

Maintenance & Reliability

Regular inspection of the 200157-21-05 ensures long-term accuracy. Check the cable and connector for damage periodically. The hermetically sealed design (5x10⁻⁸ atm·cc/s max leakage) protects against moisture and contaminants. With a temperature range of -40 °C to +105 °C, it withstands extreme conditions. This reliability reduces the need for frequent replacements, lowering total cost of ownership.

Compatibility & Integration

The 200157-21-05 works with the ProTIM option for Standard Acceleration-to-Velocity with Acceleration Enveloping channel type (-06). It integrates into Bently Nevada monitoring systems. The accelerometer outputs a positive signal (SIG+ with respect to SIG-) for acceleration from base to connector. This compatibility simplifies retrofitting into existing vibration monitoring setups.

Troubleshooting & Common Issues

A common issue is incorrect mounting torque, which can affect frequency response. Always use a torque wrench to stay within the specified 2.7 to 6.8 N·m range. If output bias voltage drifts beyond +2.5 ± 0.23 Vdc, check the excitation voltage supply. Ensure it stays between 4.7 and 5.5 Vdc. Excessive transverse sensitivity may indicate improper alignment. Verify the accelerometer is oriented correctly relative to the measurement axis.

FAQ about 200157-21-05

Q: What is the sensitivity of the 200157-21-05?

A: The sensitivity is 10.2 mV/(m/s²) (100 mV/g) at 80 Hz, with a tolerance of ±12%.

Q: What is the measurement range of this accelerometer?

A: The measurement range is ±245 m/s² (±25 g) for the accelerometer.

Q: What temperature range can the 200157-21-05 operate in?

A: It operates from -40 °C to +105 °C (-40 °F to +221 °F).

Q: What mounting thread does the 200157-21-05 use?

A: It uses a 3/8-24 female thread, with a recommended mounting torque of 2.7 to 6.8 N·m (2 to 5 ft·lbf).

Q: What approvals does the 200157-21-05 have?

A: It has Multiple Approvals including CSA, ATEX, and IECEx (approval code 05).

Product Support & Availability

The 200157-21-05 is in stock and ready to ship from Petro Auto Tech. Contact our team for pricing and lead times. We are your trusted source for Bently Nevada automation parts.