Product Overview
When slow-speed rotating machinery begins to show signs of wear, the Bently Nevada 200155-07-05 Low Frequency Trendmaster Pro Accelerometer delivers precise vibration data to catch faults early. Designed specifically for fin-fan coolers and slow rotating shafts, this industrial automation module monitors frequencies as low as 1.5 Hz, making it essential for predictive maintenance in refineries, power plants, and chemical facilities.
The 200155-07-05 combines a ceramic shear sensing element with a 316L stainless steel housing, ensuring durability in harsh environments. With multiple approvals including CSA, ATEX, and IECEx, it meets the stringent safety requirements of global industrial operations.
Technical Specifications
All specifications are at +25°C (+77°F) unless otherwise noted. The 200155-07-05 offers a sensitivity of 10.2 mV/(m/s²) (100 mV/g) at 80 Hz, providing reliable output for accurate vibration analysis.
| Parameter |
Value |
| Measurement Range |
±196 m/s² (±20 g) |
| Frequency Range (referenced to 80 Hz) |
1.5 to 10,000 Hz (90 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) |
≤2000 ms |
| Excitation Voltage |
4.7 to 5.5 Vdc |
| Quiescent Current |
<800 µA |
| Output Bias Voltage |
+2.5 ± 0.23 Vdc |
| 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 |
| Sensing Geometry |
Shear |
| Housing Material |
316L stainless steel |
Key Features
- Low frequency response down to 1.5 Hz for slow-speed machinery
- Multiple approvals: CSA, ATEX, IECEx
- Hermetic sealing for harsh environments
- 316L stainless steel construction
- Mounting stud option 07: 3/8-24 to 3/8 NPT, 3/4 inch hex stud
Industry Applications
The 200155-07-05 excels in monitoring fin-fan coolers, cooling towers, and other slow rotating shafts where standard accelerometers fail to capture low-frequency vibrations. Its ability to measure down to 1.5 Hz makes it ideal for applications such as:
- Fin-fan and air-cooled heat exchangers
- Slow-speed pumps and compressors
- Paper machine rolls and dryers
- Wind turbine low-speed shafts
In a typical fin-fan application, the 200155-07-05 detects bearing wear and imbalance early, allowing maintenance teams to schedule repairs before catastrophic failure occurs. This proactive approach reduces unplanned downtime and extends equipment life.
Installation & Setup
Proper mounting is critical for accurate readings. Use the 3/8-24 female thread with a mounting torque between 2.7 and 6.8 N•m (2 to 5 ft•lbf). Ensure the mounting surface is flat and clean to achieve optimal frequency response. The accelerometer connects to a Trendmaster Pro system using the ProTIM option with Low Frequency Acceleration-to-Velocity channel type (-05).
After installation, allow the sensor to settle for up to 2000 ms before taking measurements. Verify the output bias voltage is within +2.5 ± 0.23 Vdc to confirm proper operation.
Maintenance & Reliability
With no moving parts, the 200155-07-05 requires minimal maintenance. However, periodic inspection of the mounting stud and cable connections is recommended. The hermetically sealed design protects against moisture and contaminants, ensuring reliable performance in 100% condensing humidity environments. Regular calibration checks every 12 months help maintain measurement accuracy.
Selection Guide
When selecting the 200155-07-05, verify the mounting stud option (07) and approvals (05) match your application requirements. This model is specifically designed for low-frequency monitoring; for higher-speed machinery, other accelerometer models may be more suitable. PLC Source PRO offers this genuine Bently Nevada 200155-07-05 with full traceability, ensuring you receive an authentic part ready for immediate installation.