Introduction
When roller element bearings begin to degrade or cavitation effects threaten rotating machinery, early detection is critical to avoid unplanned downtime. The Bently Nevada 200157-17-05 Enveloping Trendmaster Pro accelerometer provides the precision needed to identify these failure modes before they escalate.
Technical Specifications Breakdown
The 200157-17-05 delivers a sensitivity of 10.2 mV/(m/s²) (100 mV/g) at 80 Hz, with a measurement range of ±245 m/s² (±25 g). Its frequency response spans 10 to 10,000 Hz (600 to 600,000 cpm), making it suitable for monitoring high-speed rotating equipment. The mounted resonant frequency exceeds 20 kHz (>1200 kcpm), ensuring reliable data across the operating band. Amplitude linearity is within ±2% (1 to 10 g pk), and transverse sensitivity is ≤7%. The accelerometer requires an excitation voltage of 4.7 to 5.5 Vdc, with a quiescent current under 800 µA and an output bias voltage of +2.5 ± 0.23 Vdc. Settling time is ≤300 ms.
Industry Applications
This accelerometer is designed for roller element bearing monitoring and detection of certain types of cavitation effects. In applications such as pumps, compressors, and turbines, the 200157-17-05 provides early warning of bearing degradation, enabling condition-based maintenance rather than reactive repairs. The Enveloping Trendmaster Pro option includes standard acceleration-to-velocity with acceleration enveloping channel type (-06), which enhances the detection of repetitive impact signals characteristic of bearing faults.
Installation & Setup Guidance
Mount the 200157-17-05 using the 3/8-24 female mounting thread. The available mounting stud option includes a 3/8-24 to 3/8-16 UNC hex plate stud (1-3/8 inch). Apply a mounting torque of 2.7 to 6.8 N·m (2 to 5 ft·lbf) to ensure proper mechanical coupling. The housing and connector material is 316L stainless steel, providing corrosion resistance in harsh environments. Allow 24 hours cure time after installation before taking critical measurements.
Maintenance & Reliability
The accelerometer operates over a temperature range of -40 °C to +105 °C (-40 °F to +221 °F) and can withstand axial shock up to 49,050 m/s² pk (5,000 g pk). Hermetic sealing limits leakage to 5×10⁻⁸ atm·cc/s maximum, protecting internal components from moisture and contaminants. The ceramic shear sensing element ensures long-term stability. Regular inspection of the mounting integrity and cable connections is recommended to maintain reliable performance.
Buying Guide
Before purchasing the Bently Nevada 200157-17-05 Enveloping Trendmaster Pro, verify that your system supports the 4.7 to 5.5 Vdc excitation voltage and that the mounting thread (3/8-24 female) matches your installation. This model carries multiple approvals (CSA, ATEX, and IECEx) as indicated by the -05 suffix. Contact SpareTechPLC for current availability and to confirm compatibility with your monitoring system.
Frequently Asked Questions
Q: What is the sensitivity of the 200157-17-05 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 accelerometer?
A: The measurement range is ±245 m/s² (±25 g) for acceleration and 14.7 mm/s² (1.5 mg) for low-level signals.
Q: What approvals does the 200157-17-05 carry?
A: The -05 suffix indicates multiple approvals: CSA, ATEX, and IECEx.
Q: What is the operating temperature range?
A: The accelerometer operates from -40 °C to +105 °C (-40 °F to +221 °F).
Q: What type of sensing element does the 200157-17-05 use?
A: It uses a ceramic shear sensing element housed in 316L stainless steel.
