High-Range Piezoelectric Accelerometer for Machinery Condition Monitoring
The Bently Nevada 330425-01-00 Accelerometer Acceleration Transducer is a three-wire piezoelectric accelerometer designed for continuous monitoring of machine casing vibration on critical rotating machinery. It belongs to the 330400/330425 Accelerometer Series and is intended for applications requiring a higher acceleration measurement range than the standard 330400 model. The 330425 provides a 75 g peak measurement range with a 25 mV/g sensitivity, making it well suited for high-vibration environments such as gearboxes, compressors, and turbines.
Unlike the 330400, which offers 100 mV/g sensitivity and a 50 g peak range, the 330425 is optimized for applications where larger vibration amplitudes are expected.
Technical Specifications
| Parameter | Specification |
|---|
| Manufacturer | Bently Nevada |
| Part Number | 330425-01-00 |
| Product Type | Accelerometer Acceleration Transducer |
| Series | 330425 Accelerometer |
| Sensor Technology | Three-wire piezoelectric |
| Sensitivity | 25 mV/g (±5%) |
| Measurement Range | 75 g peak |
| Frequency Response | 10 Hz to 15 kHz |
| Supply Voltage | -24 VDC nominal |
| Output | Voltage proportional to acceleration |
| Mounting Thread | 1/4-28 UNF integral stud |
| Housing Material | Stainless steel |
| Agency Approval | 00 – None |
| API Compliance | Designed for machinery condition monitoring applications |
Typical Applications
The 330425-01-00 is commonly used on:
-
Steam turbines
-
Gas turbines
-
Centrifugal compressors
-
Industrial gearboxes
-
Pumps
-
Electric motors
-
Fans and blowers
-
Generators
Typical monitoring functions include:
-
Machine casing vibration
-
Bearing housing acceleration
-
Gear mesh vibration
-
Structural vibration
-
Machinery diagnostics
-
Predictive maintenance
Key Features
High Dynamic Measurement Range
The 75 g peak acceleration range makes the 330425 suitable for machinery that experiences higher vibration amplitudes than those accommodated by the 330400.
Piezoelectric Sensing Technology
The sensor uses a rugged three-wire piezoelectric element to deliver stable and repeatable acceleration measurements over long service periods.
Wide Frequency Response
A frequency response of 10 Hz to 15 kHz allows the sensor to capture both low-frequency machine vibration and high-frequency events such as bearing defects and gear mesh impacts.
Stainless Steel Construction
The sealed stainless-steel housing provides excellent resistance to oil, moisture, corrosion, and harsh industrial environments.
Standard UNF Mounting
The 01 option includes a 1/4-28 UNF integral mounting stud, simplifying installation on machinery designed with imperial mounting hardware.
Frequently Asked Questions
1. What is the difference between the 330400 and 330425?
The primary differences are:
| Model | Sensitivity | Measurement Range |
|---|
| 330400 | 100 mV/g | 50 g peak |
| 330425 | 25 mV/g | 75 g peak |
The 330425 is intended for applications with higher vibration amplitudes.
2. What does the "01" option indicate?
It specifies a 1/4-28 UNF integral mounting stud.
3. What does the "00" option indicate?
It indicates no hazardous-area approvals. If hazardous-area certification is required, a version with the 05 approval option should be selected.
4. What is the sensor sensitivity?
The nominal sensitivity is 25 mV/g (±5%).
5. What frequency range does it support?
The operating frequency response is 10 Hz to 15 kHz.
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
-
Pulp & Paper
-
General Industrial Manufacturing
8. Is this sensor suitable for API 670 machinery monitoring?
The 330425 belongs to the same industrial accelerometer family as the API-oriented 330400 and is intended for continuous machinery condition monitoring where higher acceleration range is required.
A DCS Q Co., Ltd. - PLC and DCS Industrial Control Equipment Wholesale
