200157-20-05 | Bently Nevada 10.2 mV/(m/s²) Enveloping Trendmaster Pro Accelerometer

Introduction: The Evolution of Vibration Monitoring

Industrial machinery has grown more complex over the decades, demanding smarter and more reliable condition monitoring. Early vibration sensors offered basic data, but engineers needed deeper insight into bearing health and cavitation effects. The 200157-20-05 from Bently Nevada represents a significant step forward in this evolution. Designed as an Enveloping Trendmaster Pro accelerometer, it provides the sensitivity and frequency range required for modern predictive maintenance programs.

With a sensitivity of 10.2 mV/(m/s²) at 80 Hz and a measurement range of ±245 m/s² (±25 g), the 200157-20-05 captures both subtle and strong vibration signals. Its frequency response spans 10 to 10,000 Hz (600 to 600,000 cpm), making it suitable for a wide variety of rotating machinery. The accelerometer is manufactured in the U.S.A. and comes with multiple approvals including CSA, ATEX, and IECEx, ensuring it meets international safety standards.

Key Features & Technical Specifications

• Sensitivity: 10.2 mV/(m/s²) (100 mV/g) at 80 Hz, ±12%.
• Measurement Range: ±245 m/s² (±25 g) for acceleration.
• Frequency Range: 10 to 10,000 Hz (600 to 600,000 cpm).
• 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.
• Quiescent Current: <800 µA.
• Output Bias Voltage: +2.5 ± 0.23 Vdc.

These specifications ensure reliable data acquisition in demanding industrial environments. The ceramic shear sensing element and 316L stainless steel housing provide durability and corrosion resistance.

Industry Applications & Use Cases

The 200157-20-05 is specifically designed for roller element bearing monitoring and certain types of cavitation effects. In rotating machinery such as pumps, motors, compressors, and turbines, early detection of bearing wear can prevent catastrophic failures. The accelerometer works with the ProTIM option for standard acceleration-to-velocity with acceleration enveloping channel type (-06). This makes it an excellent choice for condition-based maintenance programs that rely on vibration analysis.

Because the sensor operates over a temperature range of -40 °C to +105 °C (-40 °F to +221 °F) and withstands axial shock limits of 49,050 m/s² pk (5,000 g pk), it performs reliably in harsh industrial settings. Its hermetic sealing (5×10⁻⁸ atm·cc/s maximum) and 100% relative humidity capability allow use in wet or condensing environments without submersion.

Installation & Setup

Mounting the 200157-20-05 is straightforward thanks to its 3/8-24 female thread. The recommended mounting torque is 2.7 to 6.8 N·m (2 to 5 ft·lbf). The product includes a mounting stud option (20 = 3/8-24 thread) and one magnetic mount base for temporary or permanent installation. After mounting, allow a cure time of 24 hours for optimal adhesion if using adhesive mounting. Ensure the sensor is securely fastened to avoid resonance issues and maintain accurate readings.

Proper wiring is critical: the accelerometer outputs a positive signal (SIG+) with respect to SIG− when acceleration is applied from base to connector. Excitation voltage must be between 4.7 and 5.5 Vdc. Always refer to the official Bently Nevada documentation for detailed wiring diagrams and system integration steps.

Maintenance & Reliability

To maximize the service life of the 200157-20-05, perform periodic visual inspections for physical damage or corrosion. Check the mounting torque annually or after any shock event. The sensor's hermetic seal protects internal components from moisture, but verify that the cable and connector remain intact. Regular calibration checks against a known reference ensure measurement accuracy over time.

Because the accelerometer operates in environments with 100% relative humidity (condensing, non-submerged), it is built to withstand challenging conditions. The 316L stainless steel housing resists corrosion, contributing to long-term reliability. Following these maintenance practices helps reduce unplanned downtime and extends the life of your monitoring system.

Compatibility & Integration

The 200157-20-05 is designed for use with Bently Nevada monitoring systems, particularly those supporting the ProTIM option. It provides an acceleration enveloping channel type (-06) for advanced bearing analysis. The sensor outputs a standard analog signal compatible with most industrial data acquisition modules. For system integration, consult the Bently Nevada product manual to ensure proper configuration of excitation voltage and signal conditioning.

Multiple approvals (CSA, ATEX, and IECEx) allow the accelerometer to be used in hazardous locations, expanding its compatibility with global safety standards. If you are replacing an older accelerometer, verify that the mounting thread (3/8-24 female) and electrical characteristics match your existing setup.

FAQs about the 200157-20-05

Q: What is the sensitivity of the 200157-20-05 accelerometer?

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 sensor?

A: The measurement range is ±245 m/s² (±25 g) for acceleration, and 14.7 mm/s² (1.5 mg) for low-level measurements.

Q: What approvals does the 200157-20-05 carry?

A: It carries multiple approvals: CSA, ATEX, and IECEx, as indicated by the -05 suffix.

Q: What is the operating temperature range?

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

Q: Can this sensor be used in humid environments?

A: Yes, it is rated for 100% relative humidity, condensing, non-submerged, and has hermetic sealing.

Product Support & Availability

The 200157-20-05 is available from Petro Auto Tech. Please verify current lifecycle status and availability with Petro Auto Tech before ordering. Our team can assist with product selection and technical questions to ensure you get the right accelerometer for your application.