Description
Technical Specifications Table
| Parameter | Specification |
| Model Number | Bently Nevada 138257-01 |
| Manufacturer | Bently Nevada (Baker Hughes) |
| Product Type | IEPE Accelerometer |
| Sensitivity | 100 mV/g (±5%) |
| Measurement Range | ±50 g peak |
| Frequency Response | 0.5 Hz to 10 kHz (±3 dB) |
| Output Signal | 2-10 mA constant current |
| Power Supply | 18-30 VDC, 2-20 mA |
| Resonant Frequency | >25 kHz |
| Housing Material | 316 Stainless Steel |
| Mounting | M6 threaded stud |
| Environmental Rating | IP67 |
| Operating Temperature | -40°C to +120°C (-40°F to +248°F) |
| Compliance Standards | API 670, ISO 10816 |
BENTLY 138257-01
Product Overview
The Bently Nevada 138257-01 is a high-performance industrial accelerometer designed for continuous vibration monitoring of critical rotating machinery. This rugged sensor utilizes Integrated Electronics Piezo-Electric (IEPE) technology to provide reliable acceleration measurements in demanding industrial environments.
As part of Bently Nevada’s comprehensive condition monitoring portfolio, the 138257-01 features all-welded stainless steel construction with integrated signal conditioning electronics. Its wide frequency range and excellent temperature stability make it particularly suitable for detecting early-stage bearing defects and other mechanical faults in high-speed equipment.
Key Features and Benefits
Precision Measurement:
Wide frequency response (0.5 Hz to 10 kHz)
High sensitivity (100 mV/g) for early fault detection
Excellent linearity (±1% typical)
Low noise floor for accurate diagnostics
Durable Construction:
316 stainless steel housing resists corrosion
Hermetically sealed (IP67) against moisture
Withstands 500 g mechanical shock
Vibration resistant to 20 g RMS
Installation Advantages:
Compact, low-profile design
Standard M6 mounting thread
Integral cable with strain relief
No external charge amplifier required
Industrial Applications
Power Generation:
Steam turbine bearing monitoring
Generator vibration analysis
Cooling fan condition monitoring
Oil & Gas:
Centrifugal compressor protection
Pump vibration monitoring
Gas turbine auxiliary systems
Heavy Industry:
Large motor bearing analysis
Gearbox vibration monitoring
Rolling mill equipment protection
BENTLY 138257-01
Installation Guidelines
Mounting Surface Preparation:
Clean, flat surface (Ra < 3.2 μm)
Degrease mounting area
Apply light thread lubricant
Sensor Installation:
Hand-tighten plus 1/4 turn with wrench
Recommended torque: 5-7 Nm
Avoid over-tightening
Cable Routing:
Use proper cable glands
Maintain minimum 50 mm bend radius
Secure every 300 mm
Electrical Connections:
Verify proper polarity
Check for 18-30 VDC supply
Confirm 2-10 mA output range
Maintenance Procedures
Quarterly:
Visual inspection of sensor and cable
Verify tightness of mounting
Check for corrosion or damage
Annually:
Sensitivity verification
Frequency response check
Cable integrity test
As Needed:
Recalibration if measurements drift
Replacement if damaged
Software updates for monitoring system
Troubleshooting Guide
| Symptom | Possible Cause | Corrective Action |
| No output | Wiring fault | Check connections |
| Erratic signal | Loose mount | Retighten sensor |
| Low sensitivity | Damaged element | Replace sensor |
| Excessive noise | Ground loop | Verify grounding |
Warranty and Support
Coverage:
24-month limited warranty
Covers defects in materials/workmanship
Excludes physical damage or misuse
Support Services:
Global technical assistance
Application engineering
Repair and recalibration
Spare parts availability
Documentation:
Installation manuals
Technical bulletins
Safety guidelines
Certificates of conformance
The Bently Nevada 138257-01 accelerometer provides reliable vibration monitoring for predictive maintenance programs, helping to prevent unexpected machinery failures and reduce downtime in critical industrial applications. Its rugged design and precision measurement capabilities make it an ideal choice for demanding condition monitoring applications.
