Bently Nevada 330525-00 Velomitor XA Piezo-Velocity Sensor
Introduction:
This Bently Nevada 330525-00 Velomitor XA measures velocity from 4.5 to 2000 Hz. Sensitivity 3.94 mV/mm/s, -55°C to +121°C range.
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Product Attributes:
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Product Overview
The Bently Nevada 330525-00 belongs to the Velomitor XA Piezo-velocity Sensor family. This sensor measures absolute case velocity for machinery monitoring. Sensitivity reaches 3.94 mV/mm/s (100 mV/in/s) with ±5% accuracy. Frequency response spans 4.5 to 2,000 Hz (270 to 120,000 cpm) at ±3.0 dB. A tighter response of ±0.9 dB holds from 6.0 to 1,000 Hz (360 to 60,000 cpm). The 330525-00 handles velocity up to 1270 mm/s (50 in/s) peak. Agency approval option 00 indicates no certifications required for this model. For hazardous areas, order a different approval option instead. The sensor case uses 316L stainless steel for excellent corrosion resistance. A hermetically-sealed 2-pin Mil-C-26482 connector provides reliable environmental protection.
Technical Specifications
General Specifications
| Parameter | Value |
|---|---|
| Part Number | 330525-00 |
| Model | Velomitor XA Piezo-velocity Sensor |
| Brand | Bently Nevada |
| Condition | New & Original in Factory Packing |
| Weight | 156 g (5.5 oz) typical |
| Diameter | 28 mm (1.1 in) |
| Height | 73.1 mm (2.88 in) |
| Case Material | 316L stainless steel |
| Connector | 2-pin Mil-C-26482 hermetically-sealed, 316L stainless steel shell |
| Mounting Torque | 45 N-m (33 ft-lb) maximum |
| Cable Bend Radius | 1.5-in minimum |
Performance Specifications
| Parameter | Value |
|---|---|
| Sensitivity | 3.94 mV/mm/s (100 mV/in/s) ±5% |
| Frequency Response (wide) | 4.5 to 2,000 Hz ±3.0 dB |
| Frequency Response (tight) | 6.0 to 1,000 Hz ±0.9 dB |
| Velocity Range | 1270 mm/s (50 in/s) peak |
| Transverse Sensitivity | Less than 5% of sensitivity |
| Amplitude Linearity | ±2% to 152 mm/s (6 in/s) peak |
| Mounted Resonant Frequency | Greater than 12 kHz |
| Broadband Noise Floor | 0.004 mm/s (160 µin/s) rms nominal |
| Temperature Sensitivity | -14% to +7.5% typical over range |
Electrical Specifications
| Parameter | Value |
|---|---|
| DC Voltage | -22 to -30 VDC |
| Bias Current | 2.5 to 6.0 mA |
| Output Bias Voltage | -12 ± 3.0 VDC over temperature (referenced to Pin A) |
| Dynamic Output Impedance | Less than 2400 Ω |
| Maximum Cable Length | 305 metres (1,000 feet) with BN part 02173007 |
| Grounding | Case isolated |
Environmental Specifications
| Parameter | Value |
|---|---|
| Operating Temperature | -55°C to +121°C (-67°F to +250°F) |
| Shock Survivability | 5000 g peak maximum |
| Relative Humidity | 100% non-submerged (case hermetically sealed) |
| Magnetic Field Susceptibility | <51 min/s/gauss (50 gauss, 50-60 Hz) |
Frequency Response Characteristics
The 330525-00 delivers two distinct frequency response specifications. The wider band from 4.5 to 2,000 Hz suits general purpose monitoring. Tolerance holds at ±3.0 dB across this entire range. The tighter band from 6.0 to 1,000 Hz provides higher measurement precision. Tolerance improves to ±0.9 dB in this range. For critical machinery analysis, use the tighter specification. The mounted resonant frequency exceeds 12 kHz. Therefore, the sensor avoids resonance interference in standard monitoring bands.
Sensitivity & Linearity
Sensitivity measures 3.94 mV/mm/s (100 mV/in/s) with ±5% tolerance. This high output eliminates the need for external amplifiers in most applications. Amplitude linearity holds at ±2% up to 152 mm/s (6 in/s) peak. Velocity range extends to 1270 mm/s (50 in/s) peak for high-energy machines. Transverse sensitivity stays below 5% of the main axis sensitivity. Accordingly, the 330525-00 measures primarily along its sensitive axis. Cross-axis vibration contributes minimal error.
Environmental Robustness
The 330525-00 survives extreme operating conditions with ease. Temperature range spans -55°C to +121°C (-67°F to +250°F). Shock survivability reaches 5000 g peak for machine start-up and trip events. The hermetically-sealed case allows 100% relative humidity exposure. Non-submerged operation causes no damage to internal components. Magnetic field susceptibility stays below 51 min/s/gauss at 50-60 Hz. For turbine and compressor environments, this robustness proves essential.
Power Requirements
The 330525-00 requires a DC voltage between -22 and -30 VDC. Bias current consumption ranges from 2.5 to 6.0 mA. Output bias voltage measures -12 ± 3.0 VDC referenced to Pin A. Dynamic output impedance stays below 2400 Ω. Maximum cable length reaches 305 metres (1,000 feet) with Bently Nevada part number 02173007. Signal degradation does not occur at this length. For long-distance installations between sensor and monitor, this cable capacity proves valuable.
Hazardous Area Approvals
Although the 330525-00 carries approval option 00, the Velomitor XA platform supports hazardous area certifications. Intrinsically safe approvals include Ex ia IIC T4 and AEx ia IIC T4. Class I, Division 1, Groups A, B, C, and D are approved. Class II, Groups E, F, and G also carry approval. Temperature class T4 applies from -40°C ≤ Ta ≤ 100°C. Non-incendive approvals include Ex nL IIC T4 and AEx nA IIC T4. Class I, Division 2, Groups A, B, C, and D are approved. Install per drawing 167539 for hazardous area compliance. For the 330525-00 specifically, order a different approval suffix for certified units.
Physical Construction
The 330525-00 case uses 316L stainless steel throughout. This material resists corrosion from moisture and chemicals. Diameter measures 28 mm (1.1 in) for standard mounting. Height reaches 73.1 mm (2.88 in) including the connector. Weight totals 156 g (5.5 oz) typical. The 2-pin Mil-C-26482 connector features a hermetically-sealed 316L stainless steel shell. Maximum mounting torque reaches 45 N-m (33 ft-lb). Minimum cable bend radius measures 1.5 inches. Polarity is defined as Pin A going positive with respect to Pin B when sensor case motion points toward the connector.
Installation Guidelines
Follow these steps for proper installation of the 330525-00.
Prepare a flat mounting surface on the machine casing.
Apply a thin layer of coupling grease to improve high-frequency response.
Mount the sensor using a stud or threaded hole matching the sensor base.
Tighten to maximum 45 N-m (33 ft-lb) torque. Do not exceed this value.
Connect the 2-pin Mil-C-26482 cable to the sensor connector.
Route the cable with minimum 1.5-inch bend radius to avoid damage.
Apply DC power between -22 and -30 VDC to the appropriate pins.
Verify output bias voltage measures -12 ± 3.0 VDC at room temperature.
Note: The 330525-00 requires a case-isolated mounting to avoid ground loops. Maximum cable length reaches 305 metres with Bently Nevada cable 02173007. For hazardous area installations, order a sensor with appropriate approvals.
Packaging List
One Bently Nevada 330525-00 Velomitor XA Piezo-velocity Sensor
One product calibration certificate
One mounting stud (if included with order)
One anti-static protective bag
Common FAQs
1. What is the sensitivity of the 330525-00?
Sensitivity measures 3.94 mV/mm/s (100 mV/in/s) with ±5% accuracy. This high-level output connects directly to most monitors without amplification. For example, 25 mm/s peak velocity produces approximately 98.5 mV output. The 330525-00 provides excellent signal-to-noise ratio for machinery protection systems.
2. What frequency range does the 330525-00 cover?
Frequency response spans 4.5 to 2,000 Hz at ±3.0 dB. A tighter specification of ±0.9 dB applies from 6.0 to 1,000 Hz. Low-frequency rolloff starts below 4.5 Hz. High-frequency response extends beyond 2,000 Hz but with increasing attenuation. For most rotating machinery (1x to 100x running speed), this range proves adequate.
3. Can I use the 330525-00 in a hazardous area?
The 330525-00 with approval option 00 carries no hazardous area certifications. However, the Velomitor XA platform supports intrinsic safety and non-incendive approvals. Order a different approval suffix such as 05 for CSA, ATEX, and IECEx certifications. The 330525-00 platform meets Class I, Division 1 and Division 2 requirements when correctly ordered.
4. What is the operating temperature range for the 330525-00?
Operating temperature spans -55°C to +121°C (-67°F to +250°F). Storage temperature matches this same range. The hermetically-sealed case prevents moisture ingress across this full range. For extreme high-temperature machinery like gas turbines, the 330525-00 performs reliably. Temperature sensitivity shifts -14% to +7.5% typical across this range.
5. How long can the cable be on the 330525-00?
Maximum cable length reaches 305 metres (1,000 feet) with Bently Nevada part number 02173007. Signal degradation does not occur at this length. For longer runs beyond 305 metres, signal attenuation may affect high-frequency response. Consult the frequency response graph for rolloff characteristics. The 330525-00 suits remote monitoring applications with long cable runs.
Why Choose This Sensor?
The Bently Nevada 330525-00 delivers reliable velocity measurement for critical machinery. Sensitivity of 3.94 mV/mm/s provides strong signal output without amplification. Frequency response from 4.5 to 2,000 Hz covers most machine vibration components. Hermetically-sealed 316L stainless steel construction withstands harsh environments. Operating temperature from -55°C to +121°C suits extreme applications. For turbomachinery, pumps, and compressors, choose the 330525-00.