Industrial Piezoelectric Accelerometer for Continuous Machinery Vibration Monitoring
The Bently Nevada 330400-02-00 Accelerometer Acceleration Transducer is a three-wire piezoelectric accelerometer designed for continuous measurement of machine casing vibration on critical rotating equipment. It is part of the 330400/330425 Accelerometer Series and is engineered to meet the requirements of API Standard 670 for machinery protection systems. The sensor delivers 100 mV/g sensitivity with a 50 g peak measurement range, making it suitable for monitoring gear mesh, bearing condition, structural vibration, and general machine health.
The 330400-02-00 configuration features an M8 × 1 integral mounting stud (Option 02) and no hazardous-area approvals (Option 00).
Technical Specifications
| Parameter | Specification |
|---|
| Manufacturer | Bently Nevada |
| Part Number | 330400-02-00 |
| Product Type | Accelerometer Acceleration Transducer |
| Series | 330400 Accelerometer |
| Sensor Technology | Three-wire piezoelectric |
| Sensitivity | 100 mV/g (±5%) |
| Measurement Range | 50 g peak |
| Frequency Response | 10 Hz to 15 kHz |
| Power Supply | -24 VDC nominal |
| Output Type | Voltage output |
| Mounting Thread | M8 × 1 integral stud |
| Agency Approval | 00 – None |
| Housing Material | Stainless steel |
| Application | Machine casing vibration monitoring |
Typical Applications
The 330400-02-00 is widely used on:
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Steam turbines
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Gas turbines
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Centrifugal compressors
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Pumps
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Electric motors
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Gearboxes
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Fans and blowers
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Generators
Typical monitoring applications include:
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Casing vibration measurement
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Bearing condition monitoring
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Gear mesh analysis
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Structural vibration monitoring
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Predictive maintenance
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Machine protection systems
Key Features
API 670 Compliance
The 330400 series is designed to satisfy API Standard 670 requirements for casing vibration monitoring on critical rotating machinery.
High Sensitivity
With a 100 mV/g output sensitivity and 50 g peak dynamic range, the sensor provides accurate vibration measurements for both protection and diagnostic applications.
Wide Frequency Response
The operating frequency range of 10 Hz to 15 kHz enables monitoring of both low-frequency machine vibration and higher-frequency bearing or gear-related events.
Rugged Stainless Steel Construction
A durable stainless-steel housing provides excellent resistance to industrial environments while ensuring long-term measurement stability.
M8 × 1 Integral Mounting Stud
Unlike the 330400-00-00 model, this version is supplied with an M8 × 1 integral stud, making it suitable for machinery using metric mounting hardware.
Flexible Installation
The accelerometer can be installed directly or used with Bently Nevada 43217 (standard) or 37442 (high-temperature) mounting kits for added environmental protection.
Frequently Asked Questions
1. What is the 330400-02-00 used for?
It measures machine casing acceleration for vibration monitoring, machine protection, and predictive maintenance.
2. What is the difference between 330400-00-00 and 330400-02-00?
The only standard catalog difference is the mounting thread:
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330400-00-00: 1/4-28 UNF integral stud
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330400-02-00: M8 × 1 integral stud
3. What is the sensor sensitivity?
The sensor provides 100 mV/g sensitivity with a 50 g peak measurement range.
4. What frequency range does it support?
Its typical operating frequency response is 10 Hz to 15 kHz.
5. Does this model have hazardous-area approvals?
No. The -00 approval option indicates no hazardous-area certifications. Models with -05 include multiple approvals such as CSA, ATEX, and IECEx.
6. What power supply is required?
The accelerometer operates from a -24 VDC nominal power supply.
7. Which industries commonly use this accelerometer?
It is widely used in oil & gas, power generation, petrochemical, mining, marine, and other heavy industrial applications involving rotating machinery.
8. Is the 330400 compatible with API 670 systems?
Yes. The 330400 series is specifically designed to meet API 670 requirements for machinery protection applications.
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