Product Overview
When roller element bearing failures or cavitation effects threaten rotating machinery uptime, the Bently Nevada 200157-20-05 Enveloping Trendmaster Pro accelerometer provides the early detection needed. This industrial accelerometer is designed specifically for enveloping applications, capturing high-frequency vibration signals that precede catastrophic damage.
Part of the Trendmaster Pro family, the 200157-20-05 delivers reliable performance in harsh environments. Its ceramic shear sensing element and hermetically sealed 316L stainless steel housing ensure durability in demanding conditions.
Technical Specifications Breakdown
Sensitivity and Range
At 80 Hz, the accelerometer provides a sensitivity of 10.2 mV/(m/s2) (100 mV/g) with ±12% tolerance. This high sensitivity allows detection of subtle bearing defects. The measurement range spans ±245 m/s2 (±25 g), suitable for most industrial machinery vibration levels.
Frequency Response
The frequency range covers 10 to 10,000 Hz (600 to 600,000 cpm), referenced to 80 Hz with ±10% accuracy. This wide bandwidth captures both low-speed and high-speed bearing signatures. The mounted resonant frequency exceeds 20 kHz (>1200 kcpm), ensuring accurate measurements across the operating range.
Electrical Characteristics
Excitation voltage requirements are 4.7 to 5.5 Vdc, with quiescent current below 800 µA. Output bias voltage is +2.5 ± 0.23 Vdc. The accelerometer settles within 5% of bias in ≤300 ms, enabling rapid readiness after power-up.
Environmental Durability
Rated for -40 ºC to +105 ºC (-40 ºF to +221 ºF) operation, the 200157-20-05 withstands extreme temperatures. It handles axial shock up to 49,050 m/s2 pk (5,000 g pk) and operates in 100% relative humidity (condensing, non-submerged). Hermetic sealing limits leakage to 5X10-8 atm•cc/s maximum.
Industry Applications
Roller Element Bearing Monitoring
The primary application is detecting early-stage roller element bearing defects. The enveloping channel type (-06) processes acceleration signals to extract bearing fault frequencies, enabling predictive maintenance before failures occur.
Cavitation Detection
Pumps and hydraulic systems experiencing cavitation produce distinctive high-frequency vibrations. The 200157-20-05 captures these signals, allowing operators to adjust operating conditions and prevent impeller damage.
Installation and Setup Guidance
Mount the accelerometer using the 3/8-24 female thread with a torque of 2.7 to 6.8 N•m (2 to 5 ft•lbf). The mounting stud option 20 provides a 3/8-24 thread with one magnetic mount base for temporary or permanent installations. Ensure the mounting surface is clean and flat for optimal signal transmission.
Maintenance and Reliability
Periodically inspect the cable and connector for damage, especially in high-vibration areas. Verify the mounting torque remains within specification. The hermetically sealed design minimizes contamination risks, but regular visual checks ensure long-term reliability. Follow manufacturer guidelines for calibration intervals.
Compatibility and Integration
The 200157-20-05 works with ProTIM options supporting Standard Acceleration-to-Velocity with Acceleration Enveloping channel type (-06). It integrates with Bently Nevada monitoring systems for comprehensive machinery protection. Multiple approvals (CSA, ATEX, and IECEx) allow use in hazardous locations.
Selection Guide and Purchasing Advice
Before ordering, verify the mounting thread requirement (3/8-24 female) and approval class needed for your area. The 200157-20-05 includes multiple approvals, reducing compliance complexity. Contact SpareTechPLC to confirm current availability and lifecycle status before purchasing.
Frequently Asked Questions
Q: What is the sensitivity of the 200157-20-05 at 80 Hz?
A: The sensitivity is 10.2 mV/(m/s2) (100 mV/g) with ±12% tolerance.
Q: What temperature range does this accelerometer support?
A: It operates from -40 ºC to +105 ºC (-40 ºF to +221 ºF).
Q: What approvals does the 200157-20-05 carry?
A: It carries multiple approvals including CSA, ATEX, and IECEx.
Q: What is the measurement range in g?
A: The measurement range is ±245 m/s2 (±25 g).
Q: What mounting thread does it use?
A: It uses a 3/8-24 female thread with recommended torque of 2.7 to 6.8 N•m.
