200155-07-05 | Bently Nevada 10.2 mV/(m/s²) Low Frequency Accelerometer

Introduction to the 200155-07-05 Bently Nevada Accelerometer

When industrial machinery operates at low speeds, standard accelerometers often miss critical vibration signals. The 200155-07-05 from Bently Nevada addresses this challenge directly. Designed for fin-fan cooling towers and slow-rotating shafts, this Low Frequency Trendmaster Pro accelerometer captures data from 1.5 Hz to 10,000 Hz. Its sensitivity of 10.2 mV/(m/s²) ensures reliable detection of subtle changes in machine health. For engineers seeking to extend equipment life and reduce unplanned downtime, the 200155-07-05 offers a proven solution.

Key Features and Technical Specifications

• Sensitivity at 80 Hz: 10.2 mV/(m/s²) (100 mV/g) with ±12% tolerance.
• Measurement range: ±196 m/s² (±20 g) for acceleration and 24.5 mm/s² (2.5 mg) for low-level vibration.
• Frequency range referenced to 80 Hz: 1.5 to 10,000 Hz (90 to 600,000 cpm) within ±10%.
• Mounted resonant frequency exceeds 20 kHz (>1200 kcpm).
• Amplitude linearity: ±2% from 1 to 10 g peak.
• Transverse sensitivity: ≤7%.
• Settling time within 5% of bias: ≤2000 ms.
• Excitation voltage: 4.7 to 5.5 Vdc.
• Quiescent current: <800 µA.
• Output bias voltage: +2.5 ± 0.23 Vdc.
• Axial shock limit: 49,050 m/s² pk (5,000 g pk).
• Temperature range: -40 °C to +105 °C (-40 °F to +221 °F).
• Hermetic sealing: 5×10⁻⁸ atm·cc/s (3.1×10⁻⁹ atm·in³/s) maximum.
• Relative humidity: 100% condensing, non-submerged.
• Size: 17.5 mm hex x 45.7 mm height (11/16 in x 1.8 in).
• Weight: 58 g (2.0 oz) typical.
• Mounting thread: 3/8-24 female; mounting torque: 2.7 to 6.8 N·m (2 to 5 ft·lbf).
• Sensing element: ceramic with shear geometry.
• Housing and connector material: 316L stainless steel.
• Storage temperature range: -55 °C to +121 °C (-67 °F to +250 °F).
• Cure time: 24 hours.

One distinctive spec is the settling time of ≤2000 ms. This ensures the accelerometer stabilizes quickly after power-up, allowing accurate readings sooner in critical monitoring applications.

Industry Applications and Use Cases

The 200155-07-05 excels in environments where low-frequency vibration monitoring is essential. For example, fin-fan cooling towers often operate at speeds below 300 RPM. Standard accelerometers cannot capture the subtle signals from these slow-rotating shafts. This Bently Nevada accelerometer fills that gap. Additionally, it suits applications like large fans, pumps, and compressors where early fault detection prevents catastrophic failure. By integrating this sensor into a condition monitoring program, facilities can reduce maintenance costs and improve overall reliability.

Installation and Setup Guidance

Mount the 200155-07-05 using the 3/8-24 female thread with a mounting stud option of 3/8-24 to 3/8 NPT (3/4 inch hex stud). Apply a mounting torque between 2.7 and 6.8 N·m (2 to 5 ft·lbf) to ensure proper coupling. After installation, allow 24 hours for the sensor to cure before taking critical measurements. Connect the excitation voltage between 4.7 and 5.5 Vdc, observing correct polarity: SIG+ positive with respect to SIG- for acceleration from base to connector. Verify the output bias voltage is +2.5 ± 0.23 Vdc to confirm proper operation.

Maintenance and Reliability Tips

Routine inspection of the 200155-07-05 should focus on the cable and connector integrity. Check for signs of corrosion or mechanical damage, especially in harsh environments. The hermetically sealed 316L stainless steel housing protects against moisture and contaminants. For optimal performance, verify the mounting torque annually and ensure the sensor remains free from debris. Following these steps extends service life and maintains measurement accuracy.

Compatibility and Integration

The 200155-07-05 works with the ProTIM option for Low Frequency Acceleration-to-Velocity channel type (-05). It is designed for use with Bently Nevada monitoring systems that support this accelerometer type. For integration details, refer to the official Bently Nevada documentation or contact Petro Auto Tech.

Frequently Asked Questions

What is the sensitivity of the 200155-07-05 accelerometer?

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

What temperature range can the 200155-07-05 withstand?

The operating temperature range is -40 °C to +105 °C (-40 °F to +221 °F).

How long does it take for the 200155-07-05 to settle after power-up?

The settling time within 5% of bias is ≤2000 ms.

What is the mounting thread size for the 200155-07-05?

The mounting thread is 3/8-24 female, with a stud option of 3/8-24 to 3/8 NPT.

Is the 200155-07-05 suitable for low-frequency vibration monitoring?

Yes, it is designed for low-frequency applications such as fin-fan and slow-rotating shafts, with a frequency range down to 1.5 Hz.

Product Support and Availability

The 200155-07-05 is available from Petro Auto Tech. Please verify current lifecycle status and availability with Petro Auto Tech before ordering. In stock and ready to ship, this accelerometer supports your critical monitoring needs.