Bently Nevada 169337 Industrial Accelerometer or Power Supply Module

Bently Nevada 169337 Industrial Accelerometer / Power Supply

The Bently Nevada 169337, also cataloged as the 169337 Industrial Accelerometer or Power Supply unit, operates as a dedicated hardware component for high-fidelity vibration data acquisition or reliable DC power distribution within 3500 Series Machinery Protection System platforms.

Hardware Specifications

Mechanical Monitoring and Signal Validation

The 169337 accelerometer variant provides the wide-bandwidth frequency response necessary for detecting high-frequency bearing defects and gear mesh anomalies. When installing, ensure the sensor is mounted to a clean, flat surface to optimize frequency response and prevent resonance artifacts. For proximity-based monitoring systems, verify gap voltage validation (-10 VDC targets) if the accelerometer output is being compared against displacement data for correlated rotor dynamics analysis. The stainless steel, hermetically sealed housing serves as an EMI shield, providing cross-talk suppression by minimizing the impact of radiated electrical noise on the low-level signal conditioning circuit. During calibration, confirm the transducer sensitivity against the 100 mV/g baseline to ensure accurate integration of acceleration data into velocity or displacement units within the 3500 rack.

Frequently Asked Questions (FAQ)

Q: Can the 169337 accelerometer be used in conjunction with Bently Nevada proximity probes for X-Y shaft analysis?

A: Yes. While proximity probes provide radial shaft displacement data, the 169337 accelerometer offers complementary data on high-frequency casing vibration, which is essential for comprehensive diagnostic coverage of turbine and compressor assemblies.

Q: What are the requirements for the constant current excitation (2–20 mA) when using the accelerometer?

A: The accelerometer requires a regulated constant current source within the specified range to power the internal signal conditioning amplifier. If the loop current is too low, the signal will clip; if too high, the internal circuitry may overheat.

Field Installation Guidelines

1. Mounting: Use a stainless steel mounting stud to fasten the 169337 accelerometer directly to the machinery case. Avoid using magnetic bases for permanent installations, as they introduce non-linear resonant behavior.
2. Cabling: Utilize shielded, twisted-pair cabling for the accelerometer loop. Terminate the shield at the 3500 I/O module end only to prevent ground loops that could introduce DC bias into the vibration signal.
3. Power Supply Setup: For the power supply variant, verify that the input AC supply voltage matches the configured internal transformer taps. Ensure all DC output terminals are securely fastened and polarized correctly before engaging the rack-level power input.
4. Environment: While the accelerometer housing is sealed, ensure the connector interface is protected from moisture or chemical ingress using appropriate cable boots if the installation area is subject to wash-down procedures.