Introduction
The component with part number 330130-040-10-CN is a Velocity Seismometer Pickup from Bently Nevada* (a Baker Hughes company). This device is a passive, self-generating sensor designed to measure the absolute vibration velocity of a machine's casing, bearing housings, or other structural components.
It operates on the electromagnetic induction principle, where a magnetic mass moves relative to a coiled wire within a permanent magnetic field, generating a voltage output signal that is directly proportional to the vibration velocity. Known for their ruggedness and reliability, these sensors are a cornerstone for monitoring overall machine health in industrial environments. The "-040-10-CN" suffix typically denotes a specific sensitivity (e.g., 400 mV/in/s), a 10-foot (3-meter) integral cable, and a market variant.
Parameters
The following table outlines the key technical parameters for the 330130-040-10-CN Velocity Seismometer.
| Parameter | Specification |
|---|---|
| Part Number | 330130-040-10-CN |
| Description | Velocity Seismometer / Vibration Sensor |
| Output Signal | Self-generated AC voltage (passive sensor) |
| Measurement Quantity | Velocity |
| Sensitivity | Typically 400 mV/in/s (15.75 mV/mm/s) as indicated by the "-040-" suffix. |
| Frequency Range | Typically 4.5 Hz to 1000 Hz (±3 dB) |
| Amplitude Range | Up to 2.0 inches per second (50 mm/s) peak |
| Power Requirement | None (Passive Device) |
| Electrical Connection | Integral 10-foot (3-meter) coaxial cable. |
| Housing Material | Stainless Steel |
| Operating Temperature | -50°C to 120°C (-58°F to 248°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.) | ~ 0.7 kg (1.54 lb) |
Application Scenarios
The 330130-040-10-CN Velocity Seismometer is widely used for general-purpose machinery condition monitoring where measuring the absolute vibration of the structure is the primary goal. Key application scenarios include:
Overall Casing Vibration Monitoring:
Mounted on the bearing housings or casings of machines like pumps, motors, fans, and compressors to measure the overall vibration velocity, which is a key indicator of machine health.
Machines with Rolling Element Bearings:
Ideal for equipment that does not have fluid-film bearings suitable for proximity probes. It provides an excellent measure of the forces transmitted from the rotor to the machine structure.
Structural Vibration Measurement:
Used to monitor the vibration of supporting structures, gearboxes, or other non-rotating components to assess their mechanical integrity and response to operational forces.
Condition-Based Maintenance (CbM) Programs:
Serves as a primary data collection point for CbM and predictive maintenance programs, providing reliable velocity data that can be trended over time to detect deteriorating conditions.
ISO Standards Compliance:
Vibration velocity measurements are the basis for many international standards (like ISO 10816) for evaluating machine vibration severity. This sensor provides the direct input for such evaluations.
Typical Machinery Monitored:
Pumps, Fans, and Motors
Centrifugal Compressors
Gearboxes
Generators and Turbines (for casing vibration)
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