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Product Description
The Bently Nevada 330500-02-01 Velomitor Piezo-velocity Sensor is engineered to measure absolute bearing housing and structural vibration in rotating machinery. Built with solid-state electronics and no moving parts, it delivers consistent performance and long operational life in harsh environments. It’s suitable for both horizontal and vertical mounting.
Technical Specifications
| Parameter | Value |
|---|---|
| Sensitivity | 3.94 mV/mm/s (100 mV/in/s) ±5% |
| Frequency Response | 4.5 Hz – 5 kHz ±3.0 dB / 6.0 Hz – 2.5 kHz ±0.9 dB |
| Velocity Range | 1270 mm/s (50 in/s) peak |
| Amplitude Linearity | ±2% to 152 mm/s (6 in/s) peak |
| Transverse Sensitivity | <5% of sensitivity |
| Mounted Resonant Frequency | >12 kHz |
| Output Bias Voltage | -12 ±3 VDC |
| Dynamic Output Impedance | <2400 Ω |
| Broadband Noise Floor | 0.004 mm/s (160 μin/s) rms |
| Operating Temperature Range | -55°C to +121°C (-67°F to +250°F) |
| Shock Survivability | 5,000 g peak |
| Relative Humidity | 100% non-submerged, hermetically sealed |
| Diameter (Sensor Head) | 25.3 mm (0.995 in) |
| Height | 63.2 mm (2.49 in) |
| Weight | 0.142 kg (142 g / 5.0 oz) |
| Case Material | 316L stainless steel |
| Connector | 2-pin MIL-C-5015 hermetically sealed |
| Mounting Torque | 24-40 in-lb (32-46 kg·cm) |
| Maximum Cable Length | 305 m (1,000 ft) with no signal degradation |
Applications
-
Monitoring casing vibration in steam and gas turbines
-
Measuring structural vibrations in pumps and motors
-
Vibration detection in compressors and gearboxes
-
Used in hazardous areas with appropriate certifications
-
Integration in condition monitoring and protection systems
Product Advantages
-
Solid-state design with no moving parts reduces wear
-
Operates effectively in high-shock and high-temperature environments
-
Hermetically sealed for moisture resistance
-
High frequency and amplitude linearity for accurate readings
-
Certified for use in hazardous areas (ATEX, CSA, IECEx)
-
Compatible with long cable runs up to 305 m
Frequently Asked Questions (FAQ)
Q1: What type of vibration does the 330500 sensor measure?
A1: It measures absolute casing or structural velocity vibration relative to free space.
Q2: Can the sensor be mounted in any orientation?
A2: Yes, it supports vertical, horizontal, or angled mounting.
Q3: Is the sensor suitable for hazardous environments?
A3: Yes, it holds CSA, ATEX, and IECEx certifications for Class I, Div 1 and Zone 0/1 use.
Q4: What is the recommended cable length?
A4: Standard cable lengths up to 305 m (1,000 ft) are supported without signal degradation.
Q5: What material is the sensor made of?
A5: The housing and connector shell are made of corrosion-resistant 316L stainless steel.
Q6: Does the sensor require a special mounting adapter?
A6: It can be ordered with multiple thread adapter options like UNF, UNC, or NPT.
Q7: Can this sensor be used to derive displacement?
A7: Integration is possible but may amplify noise, affecting displacement accuracy.
Q8: How does it perform under high shock?
A8: It withstands up to 5,000 g peak shock without performance degradation.
Q9: What’s the maximum frequency range supported?
A9: The sensor covers up to 5 kHz for general vibration monitoring.
Q10: Is the unit sealed against moisture?
A10: Yes, it is hermetically sealed to tolerate 100% humidity (non-submerged).
Related Models in the Same Series
| Model | Sensitivity | Frequency Range | Velocity Range | Dimensions (mm) | Weight |
|---|---|---|---|---|---|
| 330500-01-00 | 3.94 mV/mm/s | 4.5 Hz – 5 kHz | 50 in/s peak | Ø25.3 x H63.2 | 0.142 kg |
| 330500-02-00 | 3.94 mV/mm/s | 4.5 Hz – 5 kHz | 50 in/s peak | Ø25.3 x H63.2 | 0.142 kg |
| 330525 | Same as 330500 | Same as 330500 | Same | Includes NPT Adapter | 0.150 kg |
| 330750 | 4.0 mV/mm/s | 5 Hz – 2 kHz | 25 in/s peak | Custom mount style | 0.160 kg |
| 330400 | 3.94 mV/mm/s | 4 Hz – 5 kHz | 50 in/s peak | Slim-line profile | 0.135 kg |
| 21128 (Housing Only) | — | — | — | With 330500 Mounting | — |
Popular Bently Nevada Models
| Model Number | Function | Dimensions (mm) | Weight |
|---|---|---|---|
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