200157-04-05 | Bently Nevada 100 mV/g Enveloping Trendmaster Pro Accelerometer

Introduction to the Bently Nevada 200157-04-05

When roller element bearings begin to fail, the resulting downtime can halt production lines and inflate maintenance costs. The 200157-04-05 from Bently Nevada addresses this challenge directly. As an Enveloping Trendmaster Pro Accelerometer, it captures early signs of bearing wear and cavitation effects that standard sensors might miss. This model combines acceleration-to-velocity conversion with enveloping channel type (-06), making it a specialized tool for predictive maintenance programs.

Manufactured in the U.S.A., the 200157-04-05 features a mounting stud option 04 with a 3/8-24 to 1/4 NPT 1-3/8 inch hex plate stud. It carries multiple approvals including CSA, ATEX, and IECEx, ensuring suitability for hazardous environments. With a sensitivity of 10.2 mV/(m/s²) (100 mV/g) at 80 Hz, this accelerometer provides reliable data for condition monitoring systems.

Key Features and Technical Specifications

• Sensitivity: 10.2 mV/(m/s²) (100 mV/g) at 80 Hz, ±12%.
• Measurement range: ±245 m/s² (±25 g) for the accelerometer.
• Frequency range: 10 to 10,000 Hz (600 to 600,000 cpm), referenced to 80 Hz.
• Mounted resonant frequency: greater than 20 kHz (>1200 kcpm).
• Amplitude linearity: ±2% from 1 to 10 g pk.
• Transverse sensitivity: ≤7%.
• Settling time: ≤300 ms within 5% of bias.
• Excitation voltage: 4.7 to 5.5 Vdc.
• Quiescent current: less than 800 µA.
• Output bias voltage: +2.5 ± 0.23 Vdc.
• Axial shock limit: 49,050 m/s² pk (5,000 g pk).
• Temperature range: -40 °C to +105 °C (-40 °F to +221 °F).
• Sealing (hermetic): 5×10⁻⁸ atm·cc/s (3.1×10⁻⁹ atm·in³/s), maximum.
• Relative humidity: 100% relative, condensing, non-submerged.
• Size: 17.5 mm x 45.7 mm (11/16 in x 1.8 in).
• Weight: 58 g (2.0 oz), typical.
• Mounting thread: 3/8-24 female.
• Mounting torque: 2.7 to 6.8 N·m (2 to 5 ft·lbf).
• Sensing element: Ceramic, shear geometry.
• Housing and connector material: 316L stainless steel.
• Storage temperature range: -55 °C to +121 °C (-67 °F to +250 °F).
• Cure time: 24 hours.

One distinctive spec is the enveloping channel type (-06) used with ProTIM option. This feature extracts low-level impact signals from bearing defects, enabling early detection before catastrophic failure occurs. The 100 mV/g sensitivity provides a good balance between measuring small vibrations and handling higher amplitude events.

Applications and Use Cases

The 200157-04-05 is designed specifically for roller element bearing monitoring and certain cavitation effects. In rotating machinery such as pumps, motors, and compressors, this accelerometer detects early-stage bearing degradation. For example, in a petrochemical plant, the sensor can identify spalling on inner races or rolling elements weeks before failure, allowing planned maintenance instead of emergency shutdowns. The enveloping feature also helps in detecting cavitation in centrifugal pumps, where vapor bubble collapse creates high-frequency vibrations.

Installation and Setup

Mount the 200157-04-05 using the 3/8-24 female thread with a mounting torque between 2.7 and 6.8 N·m (2 to 5 ft·lbf). The mounting stud option 04 provides a 3/8-24 to 1/4 NPT adapter with a 1-3/8 inch hex plate stud for secure attachment. Ensure the mounting surface is clean and flat to avoid signal distortion. The sensor requires an excitation voltage of 4.7 to 5.5 Vdc and draws less than 800 µA quiescent current. Allow 24 hours cure time after installation if adhesive mounting is used. Polarity is positive when acceleration is applied from base to connector (SIG+ positive with respect to SIG-).

Maintenance and Reliability

Regular inspection of the sensor and its cable connection helps maintain measurement accuracy. The 316L stainless steel housing provides excellent corrosion resistance in harsh environments. The hermetic sealing (5×10⁻⁸ atm·cc/s maximum) prevents moisture ingress, even in 100% condensing humidity. With a temperature range of -40 °C to +105 °C, the accelerometer performs reliably in extreme conditions. Periodic verification of output bias voltage (should be +2.5 ± 0.23 Vdc) can indicate sensor health. Following the manufacturer's guidelines for periodic recalibration ensures long-term accuracy.

Compatibility and Integration

The 200157-04-05 is used with the ProTIM option for standard acceleration-to-velocity with acceleration enveloping channel type (-06). It integrates with Bently Nevada monitoring systems that accept 100 mV/g accelerometer inputs. The sensor outputs a positive signal relative to SIG- when acceleration is applied from base to connector. For system integration, verify that the excitation voltage matches the 4.7 to 5.5 Vdc requirement and that the quiescent current is below 800 µA. The multiple approvals (CSA, ATEX, IECEx) allow use in classified areas.

Frequently Asked Questions

Q: What is the sensitivity of the 200157-04-05 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 the 200157-04-05?

A: The measurement range is ±245 m/s² (±25 g) for the accelerometer.

Q: What approvals does the 200157-04-05 carry?

A: It carries multiple approvals including CSA, ATEX, and IECEx, as indicated by the approval code 05.

Q: What is the temperature range for the 200157-04-05?

A: The operating temperature range is -40 °C to +105 °C (-40 °F to +221 °F).

Q: What mounting thread does the 200157-04-05 use?

A: It uses a 3/8-24 female mounting thread with a recommended torque of 2.7 to 6.8 N·m (2 to 5 ft·lbf).

Product Support and Availability

The Bently Nevada 200157-04-05 is available from Petro Auto Tech. Please verify current lifecycle status and availability before ordering. Contact Petro Auto Tech for pricing, lead times, and technical support.