Introduction
The component with part number 330171-00-15-20-02-05 is a 4-20 mA Seismic Vibration Transmitter from Bently Nevada* (a Baker Hughes company). This device is an integrated, loop-powered vibration sensor designed to measure the absolute (casing) vibration of machinery.
It combines a robust seismic sensor (typically a piezoelectric accelerometer with integrated electronics) with built-in signal conditioning in a single, rugged housing. The transmitter converts the mechanical vibration directly into a standardized 4-20 mA output signal, which is proportional to the vibration velocity level. This makes it ideal for direct integration into a wide range of control and monitoring systems, such as PLCs and DCSs, without the need for separate signal conditioners. The long suffix defines its specific configuration, including range, mounting, and connector type.
*Bently Nevada is a part of Baker Hughes.
Parameters
The following table outlines the key technical parameters for the 330171-00-15-20-02-05 transmitter.
| Parameter | Specification |
|---|---|
| Part Number | 330171-00-15-20-02-05 |
| Description | 4-20 mA Seismic Vibration Transmitter |
| Output Signal | 2-Wire, 4-20 mA, loop-powered |
| Measurement Quantity | Velocity |
| Frequency Range | Typically 4.5 Hz to 1000 Hz |
| Measuring Range | Defined by the suffix; example: 0 to 20 mm/s (0 to 0.787 in/s) True Peak. |
| Power Supply | 12 to 30 VDC loop power |
| Electrical Connection | Integral cable or connector as specified by the suffix. |
| Housing Material | Stainless Steel |
| Operating Temperature | -40°C to 85°C (-40°F to 185°F) |
| Mounting | 1/4-28 UNF threaded stud (standard) |
| Dimensions (Approx.) | Diameter: ~35 mm (1.38 in), Height: ~80 mm (3.15 in) |
| Weight (Approx.) | ~0.6 kg (1.32 lb) |
Application Scenarios
This 4-20 mA vibration transmitter is designed for cost-effective, reliable monitoring of overall machine casing vibration on a wide array of industrial equipment. Key application scenarios include:
General Purpose Machinery Monitoring:
Ideal for continuous monitoring of motors, pumps, fans, compressors, and gearboxes that are critical to the process but may not require the high-level diagnostics of a full proximity probe system.
Direct PLC/DCS Integration:
The standardized 4-20 mA output allows for easy connection to virtually any Programmable Logic Controller (PLC) or Distributed Control System (DCS), enabling alarm setpoints and continuous trend monitoring within the main plant control system.
Non-Critical Asset Protection:
Provides essential protection by triggering alarms or automatic shutdowns in the control system when vibration levels exceed pre-defined limits, helping to prevent catastrophic failure and unscheduled downtime.
Condition-Based Maintenance (CbM) Programs:
Serves as a fundamental sensor for CbM initiatives, providing reliable vibration data that maintenance teams can use to track machine health over time and schedule repairs before failures occur.
Applications Where Proximity Probes Are Not Suitable:
Used on machines with rolling element bearings or on structural components where measuring shaft relative vibration is not possible or necessary. It measures the absolute vibration of the casing or structure itself.
Typical Machinery Monitored:
Pumps, Fans, and Motors
Centrifugal Compressors (for casing vibration)
Gearboxes
Generators and other general industrial rotating equipment.
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