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Product Introduction
The Bently Nevada 330900-70-05 Proximity Sensor is a high-precision, non-contact vibration and position monitoring device designed for critical rotating machinery. Built to the rigorous standards of the Bently Nevada 3300 series, it provides reliable measurements of shaft vibration, axial position, and keyphasor signals in turbines, compressors, pumps, and other industrial equipment. Its rugged construction and excellent linearity make it a trusted choice for continuous condition monitoring and predictive maintenance.
Product Specifications
| Parameter | Details |
|---|---|
| Model Number | 330900-70-05 |
| Sensing Principle | Non-contact eddy-current displacement |
| Measurement Range | 0 to 2.0 mm (80 mils) |
| Linearity | ±0.25% of full scale |
| Frequency Response | DC to 10 kHz |
| Output Signal | 4–20 mA proportional to displacement |
| Operating Temperature | –35 °C to +177 °C (–31 °F to +350 °F) |
| Power Supply | –24 V DC nominal |
| Probe Tip Diameter | 8 mm |
| Dimensions (L × W × H) | 120 × 100 × 50 mm |
| Weight | 0.12 kg |
| Environmental Protection | IP67 (dust-tight, water-resistant) |
| Compliance | CE, RoHS |
Applications
The 330900-70-05 sensor is engineered for critical machinery protection and process optimization.
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Turbines (steam, gas, hydro) for shaft vibration monitoring.
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Compressors and pumps for axial displacement detection.
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Generators and motors for early fault identification.
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Gearboxes and fans where continuous, precise proximity measurement is required.
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Integration with Bently Nevada 3500/3300 monitoring systems.
Advantages
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High Accuracy – Exceptional linearity ensures precise displacement and vibration readings.
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Robust Design – Stainless steel body and IP67 sealing for harsh industrial environments.
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Wide Temperature Range – Operates reliably in both cryogenic and high-temperature conditions.
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Easy Integration – Compatible with Bently Nevada’s 3500 protection systems and most data acquisition hardware.
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Low Maintenance – Non-contact measurement reduces wear and eliminates calibration drift.
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Fast Response – High-frequency response supports real-time condition monitoring.
FAQ
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What is the typical frequency response of the 330900-70-05 sensor?
It provides a flat response from DC up to approximately 10 kHz, enabling accurate vibration measurement. -
Can the sensor be used in hazardous or explosive environments?
Yes, when installed with certified intrinsically safe barriers or in approved enclosures. -
How is the sensor calibrated for accuracy?
Each sensor is factory-calibrated with matched extension cable length to maintain linearity. -
What type of signal output does this proximity sensor deliver?
It outputs a 4–20 mA current signal proportional to shaft displacement. -
Is the probe tip replaceable or field-serviceable?
The probe is a sealed unit; replacement involves swapping the entire probe assembly. -
What is the recommended gap between the probe and the shaft?
Typically 1.0 mm ±0.2 mm, depending on the target material and monitoring system configuration. -
Does cable length affect measurement accuracy?
Yes, the system is calibrated for a specific cable length; altering it requires recalibration. -
What materials can the sensor accurately detect?
Primarily conductive metals such as steel or stainless steel for consistent eddy-current response. -
How does temperature variation influence output stability?
The sensor’s temperature compensation minimizes drift within its –35 °C to +177 °C range. -
Is shielding required for installations near high electromagnetic fields?
Proper cable shielding and grounding are recommended to avoid electrical interference.
Related Models (Same Series)
| Model Number | Key Feature |
|---|---|
| 330900-05-05 | 5 m cable, standard sensitivity |
| 330900-05-10 | 10 m cable, extended range |
| 330900-70-10 | High-temperature version, 10 m cable |
| 330980-50-05 | Narrow-body probe for limited spaces |
| 330171-00-80 | Dual-mode probe for vibration & axial sensing |
| 330130-040-00 | Heavy-duty probe for extreme environments |
Popular Bently Nevada Models
| Model Number | Primary Use |
|---|---|
| 330500 | Proximity probe for general machinery monitoring |
| 3500/22M | Machinery protection and monitoring module |
| 330180 | High-speed keyphasor proximity probe |
| 3701/40 | Machinery condition monitoring transmitter |
| 330103 | Short-length probe for tight installations |
| 330400 | High-temperature probe for turbine applications |
