Introduction
The component with part number 330930-065-00-05 is a Velocity to 4-20 mA Transmitter from Bently Nevada* (a Baker Hughes company). This device is a compact, loop-powered signal conditioner that integrates a velocity seismometer with conditioning electronics in a single, rugged housing.
Its primary function is to measure the absolute vibration velocity of a machine's casing or structure and convert it directly into a standardized, loop-powered 4-20 mA output signal. This two-wire design simplifies installation and allows for direct integration into control systems like PLCs (Programmable Logic Controllers) or DCS (Distributed Control Systems) for continuous monitoring and alarming.
*Bently Nevada is a part of Baker Hughes.
Parameters
The following table outlines the key technical parameters for the 330930-065-00-05 transmitter.
| Parameter | Specification |
|---|---|
| Part Number | 330930-065-00-05 |
| Description | Integral Velocity to 4-20 mA Transmitter |
| Output Signal | 2-Wire, 4-20 mA, loop-powered. |
| Measurement Quantity | Velocity |
| Sensitivity / Range | The "-065-" suffix typically indicates a specific range, e.g., 0-25.4 mm/s (0-1.0 in/s) True Peak. |
| Frequency Response | Typically 4.5 Hz to 1000 Hz. |
| Power Supply | 12 to 30 VDC, supplied via the 4-20 mA loop. |
| Housing Material | Stainless Steel |
| Electrical Connection | 1/2" NPT conduit entry for cable connection. |
| Mounting | 1/4-28 UNF threaded stud (standard). |
| Operating Temperature | -40°C to 85°C (-40°F to 185°F) |
| Dimensions (Approx.) | Diameter: ~35 mm (1.38 in), Height: ~80 mm (3.15 in) |
| Weight (Approx.) | ~0.6 kg (1.32 lb) |
Application Scenarios
The 330930-065-00-05 transmitter is used for robust and simple vibration monitoring on a wide array of industrial equipment. Key application scenarios include:
Direct PLC/DCS Integration for Machinery Monitoring:
Ideal for connecting directly to a plant's PLC or DCS to monitor the overall casing vibration of motors, pumps, fans, and compressors. This allows operators to see live vibration levels and set high alarms within the main 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 failure and unscheduled downtime on general-purpose machinery.
Condition-Based Maintenance (CbM) Programs:
Serves as a fundamental sensor for CbM initiatives, providing a reliable 4-20 mA vibration signal that can be easily logged in a data historian to track machine health over time and schedule maintenance.
Machines with Rolling Element Bearings:
Perfect for equipment without fluid-film bearings (where proximity probes are used for shaft vibration). It measures the forces transmitted to the machine structure.
Retrofitting and Simplified Upgrades:
Provides a cost-effective and simple way to add vibration monitoring capability to existing machinery by leveraging ubiquitous 4-20 mA input cards, avoiding the need for more complex monitoring systems.
Typical Machinery Monitored:
Pumps, Fans, and Motors
Centrifugal Compressors (for casing vibration)
Gearboxes
Generators and other general industrial rotating equipment.
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