200155-21-05 | Bently Nevada Low Frequency Trendmaster Pro Accelerometer

What Is the 200155-21-05?

When slow rotating shafts and fin-fan applications demand reliable vibration monitoring, the 200155-21-05 from Bently Nevada provides a robust solution. This Low Frequency Trendmaster Pro Accelerometer is designed for low-frequency acceleration-to-velocity channel types, making it ideal for machinery that operates at reduced speeds. With a sensitivity of 10.2 mV/(m/s²) at 80 Hz, it captures subtle vibrations that standard accelerometers might miss.

Key Features & Technical Specs

• Sensitivity: 10.2 mV/(m/s²) at 80 Hz, ±12%.
• Measurement range: ±196 m/s² (±20 g).
• Frequency range: 1.5 to 10,000 Hz (90 to 600,000 cpm).
• Mounted resonant frequency: >20 kHz.
• 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 maximum.

One distinctive spec is the settling time of ≤2000 ms, which ensures the accelerometer stabilizes quickly after power-up, reducing wait time during commissioning.

Applications & Use Cases

Engineers working with fin-fan cooling towers or slow rotating shafts will find the 200155-21-05 particularly effective. Its low-frequency response down to 1.5 Hz captures critical data from machinery operating at low speeds, helping prevent unplanned downtime. Additionally, the multiple approvals (CSA, ATEX, and IECEx) make it suitable for hazardous environments where safety is paramount.

Installation & Setup

Mounting the accelerometer requires a 3/8-24 female thread and a torque of 2.7 to 6.8 N•m (2 to 5 ft•lbf). The mounting stud option 21 includes a 3/8-24 outer diameter to M6x1 inner diameter with a 1-3/8 inch hex plate stud. Ensure the surface is clean and flat before installation to achieve optimal coupling. After mounting, allow a 24-hour cure time if adhesive is used.

Maintenance & Reliability

Routine inspection of the accelerometer and its cable connections helps maintain reliable performance. The 316L stainless steel housing and hermetic sealing protect against moisture and corrosive environments. For long-term reliability, verify that the excitation voltage remains within 4.7 to 5.5 Vdc and that the output bias voltage stays at +2.5 ± 0.23 Vdc.

Compatibility & Integration

The 200155-21-05 is designed for use with ProTIM Option Low Frequency Acceleration-to-Velocity channel types. It integrates seamlessly into Bently Nevada monitoring systems that support these channel types. For specific compatibility details, consult the official Bently Nevada documentation.

FAQs about 200155-21-05

Q: What is the sensitivity of the 200155-21-05?

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

Q: What is the measurement range of this accelerometer?

A: The measurement range is ±196 m/s² (±20 g).

Q: What temperature range can the 200155-21-05 withstand?

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

Q: What approvals does the 200155-21-05 have?

A: It has multiple approvals including CSA, ATEX, and IECEx.

Q: What is the mounting thread size?

A: The mounting thread is 3/8-24 female.

Product Support & Availability

The 200155-21-05 is available from Petro Auto Tech. Contact our team for current stock levels and lead times. We ensure fast shipping and reliable support for your industrial automation needs.