The Bently Nevada 330500-01-04 belongs to the trusted 330500 series of Velomitor piezo-velocity sensors. This model specifically includes the -01 mounting thread option (1/2-20 UNF) and the -04 agency approval package for CSA and ATEX hazardous locations. Engineered for continuous vibration monitoring, this sensor converts mechanical motion into a proportional electrical signal without requiring an external power supply for the sensing element.
Additionally, the Bently Nevada 330500 sensor offers exceptional frequency response from 4.5 Hz to 5 kHz, making it suitable for detecting both low-speed machinery issues and high-frequency vibration events. Its case-isolated design and hermetic sealing ensure reliable performance even in humid or contaminated environments. Furthermore, the sensor’s compatibility with up to 305 meters of cable (part number 02173006) provides flexible installation options for large-scale machinery monitoring systems.
Electrical Performance
The 330500-01-04 delivers a nominal sensitivity of 3.94 mV/mm/s (100 mV/in/s) with a ±5% tolerance. Its output bias voltage measures -12 ±3.0 VDC referenced to Pin A, while the dynamic output impedance stays below 2400 Ω. These electrical characteristics ensure consistent signal transmission over long cable runs.
Frequency Response Characteristics
For general-purpose monitoring, the sensor maintains ±3.0 dB from 4.5 Hz to 5 kHz (270 to 300,000 cpm). When higher precision is required, the response tightens to ±0.9 dB between 6.0 Hz and 2.5 kHz (360 to 150,000 cpm). This dual-range capability allows the Bently Nevada 330500 to serve both broad-spectrum and application-specific vibration analysis tasks.
Amplitude Linearity and Velocity Range
The sensor exhibits ±2% linearity up to 152 mm/s (6 in/s) peak. It can measure velocities up to 1270 mm/s (50 in/s) peak, accommodating high-energy vibration events commonly found in heavy rotating equipment. Meanwhile, transverse sensitivity remains less than 5% of the axial sensitivity, minimizing cross-axis measurement errors.
Environmental Robustness
Operating temperature spans from -55°C to 121°C (-67°F to 250°F) , with a typical temperature sensitivity variation of -14% to +7.5% across this range. The hermetically-sealed case tolerates 100% relative humidity (non-submerged) and survives shocks up to 5,000 g peak. Moreover, base strain sensitivity is rated at 0.005 in/s/mstrain, while magnetic field susceptibility stays below 51 min/s/gauss at 50–60 Hz.
Constructed from 316L stainless steel, the 330500-01-04 measures 25.3 mm in diameter and 63.2 mm in height, weighing approximately 142 grams. The connector features a 2-pin Mil-C-5015 hermetically-sealed shell, also in 316L stainless steel. For proper installation, apply a mounting torque between 32–46 kg·cm (24–40 in-lb) . Polarity is defined such that when the case moves toward the connector, Pin A becomes positive relative to Pin B.
This model carries multiple certifications essential for global deployment. It meets Ex ia IIC T4 and AEx ia IIC T4 standards for Class I, Division 1, Groups A, B, C, and D, plus Class II Groups E, F, G, and Class III installations. Additionally, it complies with Ex nL IIC T4 and AEx nA IIC T4 for Class I, Division 2 applications. The temperature class T4 applies from -40°C to 100°C ambient.
Furthermore, the Bently Nevada 330500-01-04 satisfies FCC Part 15, EMC Directive 2014/30/EU, RoHS Directive 2011/65/EU, and DNV maritime rules for ships, high-speed craft, and offshore structures. These approvals simplify system certification for users in oil and gas, power generation, marine, and chemical processing industries.
Mounting Preparation
Begin by cleaning the mounting surface to ensure proper contact and thermal transfer. Use the supplied 1/2-20 UNF thread and torque the sensor to 32–46 kg·cm . Avoid overtightening, which could damage the housing or affect measurement accuracy.
Cable Routing and Length
For optimal signal integrity, Bently Nevada recommends a maximum cable length of 63 meters (208 feet) when assuming 50 g vibration at 10 kHz with 200 pF/m cable capacitance. The absolute maximum length is 305 meters (1,000 feet) using part number 02173006 without signal degradation. Route cables away from high-voltage lines and strong magnetic fields to prevent interference.
Grounding Considerations
The case is isolated from the internal circuitry, so external grounding is not required for operation. However, proper grounding practices for the monitoring system should be followed to maintain signal quality and safety compliance. Refer to installation drawing 167537 for detailed hazardous area wiring instructions.
Bently Nevada 330500-01-04 Velomitor Piezo-velocity Sensor (1 unit)
Mounting instruction sheet (1 copy)
Calibration test report (1 copy)
Note: Cables, connectors, and mounting hardware are sold separately.
1. What is the difference between the 330500-01-04 and other 330500 models?
The -01 option specifies the 1/2-20 UNF mounting thread, while the -04 designation indicates multiple hazardous area approvals including CSA and ATEX. Other suffix combinations may offer different thread types or certification levels.
2. Can this sensor be used in subsea or submerged applications?
Although the Bently Nevada 330500 is hermetically-sealed and rated for 100% relative humidity, it is not designed for continuous submersion. For underwater use, additional protective housing would be required.
3. How do I verify the sensor’s output bias voltage during installation?
Measure the DC voltage between Pin A and Pin B at the sensor connector. The expected value is -12 ±3.0 VDC at room temperature. Significant deviations may indicate a faulty sensor or improper cable termination.
4. Is the 330500-01-04 compatible with existing Bently Nevada monitoring systems?
Yes, this sensor interfaces with most Bently Nevada vibration monitors and data acquisition platforms that accept piezo-velocity inputs with the specified sensitivity and bias voltage range.
5. What shipping methods are available for this product?
All orders are dispatched via FedEx, UPS, or DHL with tracking numbers provided upon shipment. Expedited and economy options are available based on your delivery requirements.
| Brand Name | |
| Model No. | 330500-01-04 |
| Product Type | Velomitor Piezo-velocity Sensor |
| hasMerchantReturnPolicy | Adjust according to reality |
| Shippingdetails | Adjust according to reality |
