What Is the Bently Nevada 200157-21-05?
Struggling with early detection of roller element bearing faults or cavitation effects in rotating machinery? The Bently Nevada 200157-21-05 Enveloping Trendmaster Pro accelerometer delivers precise vibration data to help you catch problems before they escalate. Manufactured in the U.S.A., this sensor is part of the Trendmaster Pro family and is engineered for demanding industrial environments.
Key Technical Specifications
The 200157-21-05 offers 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 range 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, ensuring reliable performance across the operating band. Amplitude linearity is within ±2% from 1 to 10 g peak, and transverse sensitivity is ≤7%. The accelerometer settles within 5% of bias in ≤300 ms.
Real-World Applications
This accelerometer excels in monitoring roller element bearings and detecting certain cavitation effects in pumps and compressors. For example, in a paper mill, the 200157-21-05 can identify early bearing degradation, allowing maintenance teams to schedule repairs during planned downtime rather than reacting to unexpected failures. Its enveloping channel type (-06) enhances the detection of impact-type faults.
Installation and Setup Guidance
Mount the 200157-21-05 using its 3/8-24 female thread with a mounting torque of 2.7 to 6.8 N•m (2 to 5 ft•lbf). The unit includes a mounting stud option (21) with a 3/8-24 outer diameter to M6x1 inner diameter and a 1-3/8 inch hex plate stud. Ensure the mounting surface is clean and flat to maintain accurate readings. The accelerometer requires an excitation voltage of 4.7 to 5.5 Vdc and draws a quiescent current of less than 800 µA.
Maintenance and Reliability
With a hermetically sealed design (leak rate ≤5×10⁻⁸ atm•cc/s) and 316L stainless steel housing, the 200157-21-05 withstands harsh conditions. Its operating temperature range is -40 °C to +105 °C (-40 °F to +221 °F), and it handles 100% relative humidity (condensing, non-submerged). The axial shock limit is 49,050 m/s² pk (5,000 g pk). Regular inspection of the cable and connector is recommended to maintain signal integrity.
Compatibility and Integration
The 200157-21-05 works with the ProTIM option for standard acceleration-to-velocity with acceleration enveloping. It outputs a positive signal (SIG+ positive with respect to SIG-) and has an output bias voltage of +2.5 ± 0.23 Vdc. The accelerometer is approved with multiple certifications: CSA, ATEX, and IECEx (option 05).
Selection Guide and Purchasing Advice
Before purchasing, verify that your monitoring system supports the 200157-21-05's sensitivity and frequency range. The unit weighs 58 g (2.0 oz) and measures 17.5 mm x 45.7 mm (11/16 in x 1.8 in). SpareTechPLC offers this Bently Nevada accelerometer with fast shipping and expert support to help you select the right sensor for your application.
Frequently Asked Questions
Q: What is the sensitivity of the 200157-21-05?
A: The sensitivity is 10.2 mV/(m/s²) (100 mV/g) at 80 Hz, with a tolerance of ±12%.
Q: What is the frequency range of this accelerometer?
A: The frequency range is 10 to 10,000 Hz (600 to 600,000 cpm), referenced to 80 Hz.
Q: What approvals does the 200157-21-05 have?
A: It has multiple approvals including CSA, ATEX, and IECEx (option 05).
Q: What is the operating temperature range?
A: The operating temperature range is -40 °C to +105 °C (-40 °F to +221 °F).
Q: What type of applications is this accelerometer used for?
A: It is designed for roller element bearing monitoring and detecting certain cavitation effects.
