Product Overview
The Bently Nevada 200157-21-05 is an Enveloping Trendmaster Pro accelerometer designed for continuous vibration monitoring in industrial environments. This industrial automation module excels at detecting early faults in roller element bearings and certain cavitation effects, helping you avoid unplanned downtime.
Each unit is manufactured in the U.S.A. and includes a mounting stud option (21) with a 3/8-24 outer diameter to M6x1 inner diameter, featuring a 1-3/8 inch hex plate stud. The approval code (05) indicates multiple certifications: CSA, ATEX, and IECEx, ensuring suitability for hazardous areas.
Technical Specifications
All specifications are measured at +25°C (+77°F) unless otherwise noted. The Bently Nevada 200157-21-05 delivers reliable performance across a wide operating range.
| Parameter |
Value |
| Sensitivity @ 80 Hz (±12%) |
10.2 mV/(m/s²) (100 mV/g) |
| Measurement Range |
±245 m/s² (±25 g) |
| Frequency Range (Referenced to 80 Hz, ±10%) |
10 to 10,000 Hz (600 to 600,000 cpm) |
| Mounted Resonant Frequency |
>20 kHz (>1200 kcpm) |
| Amplitude Linearity (1 to 10 g pk) |
±2% |
| Transverse Sensitivity |
≤7% |
| Settling Time (Within 5% of Bias) |
≤300 ms |
| Excitation Voltage |
4.7 to 5.5 Vdc |
| Output Bias Voltage |
+2.5 ± 0.23 Vdc |
| Quiescent Current |
<800 µA |
| Axial Shock Limit |
49,050 m/s² pk (5,000 g pk) |
| Temperature Range (Operating) |
-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), max |
| Relative Humidity |
100% condensing, non-submerged |
| Size (Hex × Height) |
17.5 mm × 45.7 mm (11/16 in × 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 Material |
316L stainless steel |
Industry Applications
The 200157-21-05 is purpose-built for roller element bearing monitoring and detection of cavitation effects. Use it in:
- Rotating machinery such as pumps, motors, and fans where bearing health is critical.
- Paper mills, steel plants, and other heavy industries that demand continuous vibration monitoring.
- Hazardous environments requiring ATEX/IECEx certified equipment.
Its high sensitivity and wide frequency range make it an excellent choice for predictive maintenance programs, helping you reduce downtime and extend equipment life.
Installation & Setup
Mount the accelerometer using the provided 3/8-24 female thread. Apply the specified mounting torque of 2.7 to 6.8 N•m (2 to 5 ft•lbf) to ensure proper coupling. For best results, mount the sensor directly on the bearing housing or as close as possible to the bearing load zone. Ensure the mounting surface is clean and flat to avoid signal distortion.
Wire the sensor to the monitoring system with the correct polarity: SIG+ positive with respect to SIG-. The excitation voltage must be within 4.7 to 5.5 Vdc. After installation, verify the output bias voltage is +2.5 ± 0.23 Vdc and check the quiescent current is below 800 µA to confirm proper operation.
Maintenance & Reliability
The hermetically sealed design protects the internal electronics from moisture and contamination, ensuring long-term reliability. With no moving parts, the accelerometer requires minimal maintenance. Periodically inspect the mounting stud for looseness and check the cable for damage. The operating temperature range of -40 °C to +105 °C allows use in extreme conditions. The 316L stainless steel housing resists corrosion, making it suitable for harsh industrial environments.
Selection Guide
When ordering, verify the part number 200157-21-05 matches your requirements. The mounting stud option 21 provides a 3/8-24 to M6x1 adapter, ideal for installations requiring metric conversion. The approval code 05 ensures compliance with CSA, ATEX, and IECEx standards. For integration with the ProTIM option, select the standard acceleration-to-velocity with acceleration enveloping channel type (-06).
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