Introduction
When roller element bearings fail unexpectedly, the resulting downtime can cripple production. The Bently Nevada 200157-08-05 Enveloping Trendmaster Pro accelerometer provides early detection of bearing faults and cavitation effects, helping you avoid catastrophic failures. This sensor delivers reliable vibration data for predictive maintenance programs.
Technical Specifications Breakdown
The 200157-08-05 offers a sensitivity of 10.2 mV/(m/s²) (100 mV/g) at 80 Hz, with a tolerance of ±12%. This ensures consistent output for accurate trend analysis. Its measurement range spans ±245 m/s² (±25 g), covering both normal operation and fault conditions.
Frequency response extends from 10 to 10,000 Hz (600 to 600,000 cpm), referenced to 80 Hz with ±10% tolerance. This wide range captures low-speed rotational vibrations and high-frequency bearing defects. The mounted resonant frequency exceeds 20 kHz, preventing resonance interference in most industrial applications.
Amplitude linearity holds within ±2% from 1 to 10 g peak, while transverse sensitivity stays ≤7%. These specs guarantee reliable readings even when vibration direction varies. Settling time is ≤300 ms, allowing quick stabilization after power-up.
Excitation voltage ranges from 4.7 to 5.5 Vdc, with quiescent current under 800 µA. Output bias voltage is +2.5 ± 0.23 Vdc. Polarity is SIG+ positive with respect to SIG- for acceleration from base to connector.
Industry Applications
Roller element bearing monitoring is the primary application. The Enveloping Trendmaster Pro detects early-stage bearing wear by capturing high-frequency impact signals. It also identifies cavitation effects in pumps and turbines, where vapor bubble collapse generates distinctive vibration patterns.
In paper mills, steel plants, and refineries, this accelerometer mounts directly on bearing housings to provide continuous vibration data. Its 100% relative humidity rating (condensing, non-submerged) suits harsh environments.
Installation & Setup Guidance
Mount the 200157-08-05 using the 3/8-24 female thread. Apply mounting torque between 2.7 to 6.8 N·m (2 to 5 ft·lbf). The mounting stud option (08) provides a 3/8-24 to 1/2 NPT adapter with a 1-inch hex stud for secure attachment.
Allow 24 hours cure time after installation before taking critical measurements. Use the ProTIM option with Standard Acceleration-to-Velocity and Acceleration Enveloping channel type (-06) for optimal performance.
Maintenance & Reliability
The hermetically sealed design (5x10⁻⁸ atm·cc/s maximum leak rate) protects internal components from moisture and contaminants. The 316L stainless steel housing and connector resist corrosion in demanding environments.
Operating temperature range is -40°C to +105°C (-40°F to +221°F). Storage temperature extends from -55°C to +121°C (-67°F to +250°F). Axial shock limit reaches 49,050 m/s² pk (5,000 g pk), ensuring survival during accidental impacts.
Regularly inspect the mounting integrity and cable connections. Verify output bias voltage periodically to detect sensor degradation. Follow manufacturer guidelines for calibration intervals.
Compatibility & Integration
The 200157-08-05 works with Bently Nevada monitoring systems that accept accelerometer inputs. It is designed for use with the Enveloping Trendmaster Pro platform. The sensor outputs a standard acceleration signal compatible with most vibration monitoring modules.
Selection Guide & Purchasing Advice
Before ordering, confirm your system requires the Enveloping Trendmaster Pro accelerometer with multiple approvals (CSA, ATEX, and IECEx). Verify the mounting thread (3/8-24 female) matches your installation. SpareTechPLC stocks this exact model for fast delivery.
Check the ProTIM option compatibility with your existing monitoring hardware. The 200157-08-05 is made in the U.S.A. and includes the 08 mounting stud option.
Frequently Asked Questions
Q1: What is the sensitivity of the 200157-08-05?
A1: The sensitivity is 10.2 mV/(m/s²) (100 mV/g) at 80 Hz, with ±12% tolerance.
Q2: What frequency range does this accelerometer cover?
A2: It covers 10 to 10,000 Hz (600 to 600,000 cpm), referenced to 80 Hz with ±10% tolerance.
Q3: Can this sensor be used in hazardous areas?
A3: Yes, the 05 approval option includes multiple approvals: CSA, ATEX, and IECEx.
Q4: What is the maximum operating temperature?
A4: The operating temperature range is -40°C to +105°C (-40°F to +221°F).
Q5: What is the mounting thread size?
A5: The mounting thread is 3/8-24 female, with a mounting torque of 2.7 to 6.8 N·m (2 to 5 ft·lbf).
