Bently Nevada 200157-11-05 Enveloping Trendmaster Pro Accelerometer

Product Overview

When roller element bearings begin to fail or cavitation effects threaten rotating machinery, the Bently Nevada 200157-11-05 Enveloping Trendmaster Pro accelerometer provides the early warning you need. This sensor is engineered specifically for detecting the subtle high-frequency signatures that precede catastrophic failure, making it an essential component in predictive maintenance programs.

Part of the Trendmaster Pro family, the 200157-11-05 is designed for continuous vibration monitoring in harsh industrial environments. It offers a comprehensive solution for asset protection, combining acceleration enveloping with standard acceleration-to-velocity processing when used with the ProTIM option.

Technical Specifications

The Bently Nevada 200157-11-05 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), referenced to 80 Hz. The mounted resonant frequency exceeds 20 kHz (>1200 kcpm), ensuring accurate readings across a wide spectrum.

Amplitude linearity is within ±2% (1 to 10 g pk), and transverse sensitivity is ≤7%. The accelerometer settles within 300 ms of bias voltage. Excitation voltage ranges from 4.7 to 5.5 Vdc, with quiescent current below 800 µA and output bias voltage of +2.5 ± 0.23 Vdc. Polarity is SIG+ positive with respect to SIG- for acceleration from base to connector.

Environmental specifications include an axial shock limit of 49,050 m/s² pk (5,000 g pk), temperature range of -40 °C to +105 °C (-40 °F to +221 °F), hermetic sealing at 5×10⁻⁸ atm·cc/s maximum, and 100% relative humidity (condensing, non-submerged). Physical dimensions are 17.5 mm x 45.7 mm (11/16 in x 1.8 in), weight 58 g (2.0 oz) typical, with a 3/8-24 female mounting thread and recommended mounting torque of 2.7 to 6.8 N·m (2 to 5 ft·lbf). The sensing element is ceramic with shear geometry, housed in 316L stainless steel. Storage temperature range is -55 °C to +121 °C (-67 °F to +250 °F) with a 24-hour cure time.

Industry Applications

The 200157-11-05 excels in monitoring roller element bearings in pumps, motors, compressors, and turbines. Its acceleration enveloping capability isolates bearing defect frequencies from background vibration, enabling early detection of spalling, brinelling, or cage wear. This proactive approach reduces unplanned downtime and extends equipment life.

Another key application is detecting cavitation effects in centrifugal pumps and hydraulic systems. The sensor's high-frequency response captures the broadband energy generated by collapsing vapor bubbles, allowing operators to adjust operating conditions before impeller damage occurs.

Installation & Setup Guidance

Proper mounting is critical for accurate readings. The 200157-11-05 uses a 3/8-24 female thread and should be torqued to 2.7 to 6.8 N·m (2 to 5 ft·lbf) onto a clean, flat surface. The mounting stud option (11 3/8-24 to 1-1/4 NPT, 1-3/4 inch hex stud) provides flexibility for various installation points. Ensure the sensor is oriented correctly for the desired measurement axis and that the cable is secured to avoid strain.

When integrating with a monitoring system, verify that the excitation voltage matches the 4.7 to 5.5 Vdc requirement and that the signal polarity is correct. Allow the sensor to stabilize for at least 300 ms after power-up before taking measurements.

Maintenance & Reliability

The hermetically sealed 316L stainless steel housing provides excellent protection against moisture and contaminants, supporting reliable operation in condensing humidity environments. Periodic inspection of the mounting surface and cable connections helps maintain signal integrity. The ceramic shear sensing element offers long-term stability, reducing the need for frequent recalibration.

Given its temperature range of -40 °C to +105 °C, the accelerometer suits both cold outdoor installations and hot machinery casings. Regular verification of bias voltage and sensitivity ensures consistent performance over time.

Selection Guide & Purchasing Advice

When selecting the Bently Nevada 200157-11-05, confirm your application requires acceleration enveloping for bearing or cavitation monitoring. Verify that your monitoring system supports the ProTIM option for standard acceleration-to-velocity with acceleration enveloping. The multiple approvals (CSA, ATEX, and IECEx) make this sensor suitable for hazardous area installations.

For complete technical specifications and current availability, please contact BluePLC Industrial. Our team can help you verify compatibility with your existing Bently Nevada systems and recommend the appropriate mounting accessories and cables.