Introduction
The component with part number 330980-50-05 is a Velocity to 4-20 mA Converter from Bently Nevada* (a Baker Hughes company). This device is a standalone signal conditioner that accepts a voltage signal from a passive velocity seismometer and converts it into a standardized, loop-powered 4-20 mA output signal.
Its primary function is to enable the integration of vibration velocity data into control systems, such as PLCs (Programmable Logic Controllers) or DCS (Distributed Control Systems), that are designed to work with analog current inputs. This allows for continuous monitoring and alarming of overall machine vibration in systems that may not have a dedicated monitoring framework like the 3500 system. The "-50-05" suffix typically specifies a particular model variant and possibly a 5-meter cable length.
Parameters
The following table outlines the key technical parameters for the 330980-50-05 converter.
| Parameter | Specification |
|---|---|
| Part Number | 330980-50-05 |
| Description | Velocity to 4-20 mA Converter / Signal Conditioner |
| Input Signal | AC voltage from a passive velocity seismometer (e.g., 100 mV/in/s). |
| Output Signal | 2-Wire, 4-20 mA, loop-powered. |
| Input Power | 12 to 30 VDC, supplied via the 4-20 mA loop. |
| Frequency Response | Typically 4.5 Hz to 1000 Hz (follows the connected seismometer's range). |
| Adjustable Scaling | Yes, the conversion from mV to mA is field-adjustable to match the seismometer's sensitivity. |
| Electrical Connection | Integral 5-meter cable or terminal housing connection. |
| Housing Material | Metal enclosure for EMI shielding and durability. |
| Mounting | DIN rail mount or direct surface mount. |
| Operating Temperature | -40°C to 85°C (-40°F to 185°F) |
| Dimensions (Approx.) | 90 mm x 70 mm x 60 mm (H x W x D) (3.54 in x 2.76 in x 2.36 in) |
| Weight (Approx.) | 0.5 kg (1.1 lb) |
Application Scenarios
The 330980-50-05 converter is used in applications where simple, reliable integration of vibration data into a basic control or monitoring scheme is required. Key application scenarios include:
PLC/DCS Integration for Non-Critical Assets:
Used to connect a velocity seismometer on motors, pumps, or fans to a plant's PLC or DCS. This allows operators to see live vibration levels and set simple high alarms directly within the main control system interface.
Retrofitting and Upgrading Existing Systems:
Provides a cost-effective way to add vibration monitoring capability to older machinery that lacks modern digital monitoring systems, by leveraging existing 4-20 mA input cards on the control system.
Standalone Machinery Protection:
Can be used to create a simple protection loop where the 4-20 mA signal is fed into a relay trip unit or a single-channel monitor to initiate an alarm or shutdown if vibration exceeds a set limit.
Condition-Based Maintenance (CbM) on a Budget:
Enables basic trending of machine health by logging the 4-20 mA vibration signal in a data historian, helping maintenance teams identify deteriorating conditions without a large investment in a full-scale monitoring system.
Portable Monitoring Setups:
Sometimes used in temporary installations for machinery troubleshooting or for conducting short-term performance tests where permanent instrumentation is not justified.
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