The Bently Nevada 330500-04-04 offers reliable velocity sensing for industrial machines. This Velomitor Piezo-velocity Sensor converts case motion directly into a proportional electrical signal. You can use it in turbines, compressors, and pumps.
Many plants trust Bently Nevada for vibration monitoring. The 330500-04-04 model works in extreme temperatures from -55°C to 121°C. Its stainless steel case resists corrosion and seals against humidity.
Electrical Sensitivity
The sensor provides 3.94 mV/mm/s (100 mV/in/s) ±5%. This output is linear across its velocity range.
Frequency Response
From 4.5 Hz to 5 kHz (270 to 300 kcpm) at ±3.0 dB. Additionally, the range of 6.0 Hz to 2.5 kHz (360 to 150 kcpm) keeps error within ±0.9 dB.
Output Bias Voltage
It outputs -12 ±3.0 VDC referenced to Pin A. This bias remains stable over the full temperature range.
Velocity and Linearity
Peak velocity reaches 1270 mm/s (50 in/s). Amplitude linearity stays within ±2% up to 152 mm/s (6 in/s) peak.
Transverse Sensitivity
Less than 5% of the main sensitivity. Therefore, side motion causes minimal error.
Mounted Resonant Frequency
Greater than 12 kHz. This high resonance avoids interference with measurement bands.
Dynamic Output Impedance
Below 2400 Ω. Thus, it drives long cables reliably.
Broadband Noise Floor (4.5 Hz to 5 kHz)
Only 0.004 mm/s (160 μin/s) rms. This low noise ensures clean signals.
Grounding
The case is isolated. Consequently, ground loops are much less likely.
Maximum Cable Length
Up to 305 metres (1,000 feet) of cable part number 02173006. Signal degradation does not occur within this length.
Operating Temperature Range
-55°C to 121°C (-67°F to 250°F). Hence, it suits both cold startups and hot turbine areas.
Shock Survivability
Withstands 5,000 g peak. This ruggedness prevents damage during sudden impacts.
Relative Humidity
Works up to 100% non-submerged conditions. The hermetically-sealed case blocks moisture ingress.
Base Strain Sensitivity
0.005 in/s/mstrain. Therefore, mounting surface flexing barely affects readings.
Magnetic Field Susceptibility
Below 51 min/s/gauss at 50 gauss, 50-60Hz. Thus, nearby motors or generators cause negligible interference.
Physical Dimensions
Weight is 142 grams (5.0 oz) typical. Diameter measures 25.3 mm (0.995 in). Height is 63.2 mm (2.49 in).
Case Material
316L stainless steel. This material resists rust and chemical attack.
Connector
2-pin Mil-C-5015 with a 316L stainless steel shell. It is also hermetically sealed.
Mounting Torque
Apply 32-46 kg cm (24-40 in-lb) maximum. Over-torque may damage the sensor or threads.
Polarity
When the sensor case moves toward the connector, Pin A becomes positive relative to Pin B.
Recommended Cable Length for High Vibration
For 50g vibration at 10 kHz with 200 pF/m cable capacitance, use 63 metres (208 feet).
The 330500-04-04 meets several standards. It follows FCC Part 15 rules. It also complies with EMC Directive 2014/30/EU and RoHS Directive 2011/65/EU.
Maritime approvals include DNV rules for ships, high-speed craft, and offshore standards.
For hazardous areas:
Ex ia IIC T4 / AEx ia IIC T4
Class I, Division 1, Groups A, B, C, D
Class II, Groups E, F, G and Class III
Ex nL IIC T4 / AEx nA IIC T4
Class I, Div 2, Groups A, B, C, D
Temperature rating: T4 @ -40°C ≤ Ta ≤ 100°C. Install per drawing 167537.
First, ensure the mounting surface is clean and flat. Next, apply anti-seize compound on threads if needed. Then, tighten the sensor to 32-46 kg cm (24-40 in-lb). For best results, avoid over-tightening.
Use a compatible cable like part 02173006. Connect Pin A and Pin B correctly. Remember the polarity rule described above. If you extend cable beyond 63 metres in high-frequency environments, verify signal integrity.
Finally, route the cable away from high-voltage or high-current lines. This practice reduces electrical noise pickup.
Bently Nevada 330500-04-04 Velomitor Piezo-velocity Sensor (1 unit)
Protective dust cap for connector
Installation instruction sheet (drawing reference 167537)
Note: No calibration certificate or warranty document is included. Contact us for those separately.
1. Can the Bently Nevada 330500-04-04 replace an older 330500 model without system changes?
Yes, the 330500-04-04 shares the same sensitivity and frequency response. However, verify your mounting thread compatibility first.
2. What happens if I exceed the 1270 mm/s peak velocity?
The output may clip or become non-linear. Above 152 mm/s, amplitude linearity exceeds ±2%. Consequently, measurement accuracy decreases.
3. Does this sensor work with any Bently Nevada monitor?
Most Bently Nevada monitors accept the Velomitor Piezo-velocity Sensor signal. Specifically, check that the monitor accepts a -12 VDC bias and 3.94 mV/mm/s sensitivity.
4. How do I clean the 330500-04-04 after use in a dirty environment?
Use a soft cloth with mild soap and water. Do not use high-pressure spray. Avoid solvents that may damage the connector seal.
5. What shipping methods do you offer?
We ship via FedEx, UPS, or DHL. Delivery typically takes 3-7 business days depending on your location.
| Brand Name | Bently Nevada |
| Model No. | 330500-04-04 |
| Product Type | Velomitor Piezo-velocity Sensor |
| hasMerchantReturnPolicy | Adjust according to reality |
| Shippingdetails | Adjust according to reality |
