Built for Extreme Temperature Machinery Monitoring
The Bently Nevada 330450-20 High Temperature Accelerometer is an industrial-grade vibration monitoring solution specifically engineered for applications where conventional accelerometers cannot withstand elevated operating temperatures. As part of the 330450 High Temperature Acceleration System (HTAS), this model separates the sensing element from the signal conditioning electronics through a permanently attached hardline cable, allowing the sensing head to operate on surfaces reaching 400°C (752°F) while maintaining accurate and stable vibration measurements.
The 330450-20 configuration includes a 2-meter hardline cable, providing installation flexibility for machinery operating in high-temperature environments such as gas turbines, steam turbines, exhaust systems, furnaces, and industrial process equipment. Designed for continuous online condition monitoring, this accelerometer delivers dependable performance in harsh industrial settings where equipment reliability is critical.
Its rugged construction, wide frequency response, and exceptional thermal capability make the 330450-20 an ideal solution for predictive maintenance programs and machinery protection systems across power generation, petrochemical, and heavy industrial applications.
Technical Data
| Specification | Details |
|---|
| Manufacturer | Bently Nevada |
| Model Number | 330450-20 |
| Product Type | High Temperature Accelerometer |
| Series | 330450 High Temperature Acceleration System (HTAS) |
| Sensor Technology | Piezoelectric Accelerometer |
| Sensitivity | 100 mV/g (10.2 mV/m/s²) ±5% |
| Measurement Range | 80 g Peak |
| Frequency Response | 15 Hz to 10 kHz (±3 dB) |
| Amplitude Linearity | ±2% Full Scale |
| Supply Voltage | -24 ±0.5 VDC |
| Output Bias Voltage | Approximately -12 VDC |
| Maximum Sensor Head Temperature | +400°C (+752°F) |
| Electronics Operating Temperature | -40°C to +100°C |
| Cable Length | 2 m Hardline Cable |
| Connector Type | MIL-C-5015 |
| Housing Material | Stainless Steel |
| Hazardous Area Certification | CSA, ATEX, IECEx (configuration dependent) |
| Dimensions | Sensor head approximately Ø32 mm × 54 mm |
| Weight | Approximately 1.5 kg (complete system with 2 m cable) |
Typical Applications
Designed for continuous monitoring under extreme thermal conditions, the 330450-20 is widely used in industries where high process temperatures make conventional vibration sensors unsuitable.
Typical applications include:
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Gas turbine vibration monitoring
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Steam turbine bearing housings
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Industrial furnace equipment
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Boiler systems
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Heat recovery steam generators (HRSG)
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Exhaust duct monitoring
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Petrochemical processing plants
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Refinery rotating machinery
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Cement kiln equipment
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Steel manufacturing facilities
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Industrial compressors
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High-temperature pumps and fans
Its unique remote-electronics design ensures reliable vibration measurements even when the sensing point is exposed to intense heat, helping maintenance teams identify imbalance, looseness, bearing wear, and other developing machinery faults before they lead to unexpected shutdowns.
Performance Highlights
The 330450-20 has been developed to provide dependable vibration monitoring where standard accelerometers reach their operational limits.
Key advantages include:
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Designed for surface temperatures up to 400°C (752°F)
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Remote electronics improve long-term measurement stability
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High sensitivity for accurate machinery diagnostics
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Wide frequency response supports detailed vibration analysis
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Rugged stainless-steel construction for demanding environments
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Hardline cable minimizes connector-related failures
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Suitable for continuous online machinery protection
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Excellent resistance to vibration, shock, and industrial contamination
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Compatible with Bently Nevada monitoring and protection systems
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Helps improve equipment availability while reducing maintenance costs
Technical FAQs
1. What makes the 330450-20 different from a standard accelerometer?
Its sensing element is physically separated from the signal conditioning electronics, allowing the sensor head to operate at temperatures up to 400°C.
2. What does the "-20" suffix represent?
The "-20" configuration specifies a 2-meter hardline cable between the sensing head and the remote electronics.
3. What is the maximum sensing temperature?
The sensing head can be mounted on surfaces reaching 400°C (752°F).
4. What vibration range can it measure?
The system measures vibration up to 80 g peak.
5. Which industries commonly use this accelerometer?
Power generation, oil and gas, petrochemical processing, mining, metals, and heavy manufacturing are among its primary applications.
6. Can it be used for continuous online monitoring?
Yes. It is designed for permanent installation in continuous machinery condition monitoring systems.
7. What type of connector does the system use?
It utilizes a durable MIL-C-5015 industrial connector.
8. Why are the electronics mounted remotely?
Keeping the electronics in a cooler location protects sensitive components from excessive heat while maintaining measurement accuracy.
9. Is the 330450-20 suitable for hazardous environments?
Selected configurations are available with international hazardous-area approvals including CSA, ATEX, and IECEx.
10. Why is this accelerometer a preferred solution for high-temperature applications?
Its innovative remote-electronics architecture, excellent thermal capability, and dependable vibration performance make it ideal for protecting valuable rotating machinery operating under extreme temperature conditions.
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