WhatsApp: +86 16626708626
Email: 
Phone: +86 16626708626Description
Key Technical Specifications
- Part Number: 330500-02-CN
- Product Name: Velomitor Piezo-Velocity Sensor
- Brand: Bently Nevada
- Sensor Type: Piezoelectric integrating accelerometer (velocity output)
- Sensitivity: 100 mV/in/sec (±10%)
- Frequency Range: 2 Hz to 10 kHz (full range); 10 Hz to 1 kHz (±10%)
- Dynamic Range: 0.25 in/sec to 100 in/sec (6.35 mm/s to 2540 mm/s)
- Velocity Measurement Range: Up to 10 in/s (254 mm/s)
- Output Format: 4–20 mA current loop
- Excitation Voltage: 12 to 30 Vdc (current limited to 40 mA)
- Connection Type: 2-pin connector
- Case Material: 316L stainless steel
- Operating Temperature: -40°C to +85°C (-40°F to +185°F)
- Storage Temperature: -40°C to +125°C (-40°F to +257°F)
- Mounting Torque: 4 to 7 N·m (35.4 to 62.0 in-lbf)
- Linearity: ±1% full scale
- Agency Approval Option: CN = Approvals country specific (China)
- Country of Origin: United States (Made in USA)
- Application: Bearing housing, casing, or structural vibration on rolling-element bearing machines
- 330500-02-CN
Product Introduction
Bently Nevada 330500-02-CN is a Velomitor Piezo-Velocity Sensor designed to measure absolute vibration on bearing housings, casings, or structures. It uses a piezoelectric integrating accelerometer to produce a 4–20 mA current loop output proportional to velocity with 100 mV/in/s sensitivity over a 2 Hz–10 kHz frequency range.
The -02-CN suffix indicates 2-pin connection and China-specific (CN) agency approvals, making it suitable for customers in China requiring localized certifications. Its 316L stainless steel case, wide dynamic range, and solid-state design support safe vibration monitoring on rotating machinery in industrial environments.
Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| No 4–20 mA output signal | Excitation voltage absent or wiring fault | ✅ High | Verify 12–30 Vdc supply at sensor terminals; check 2-pin cable continuity | Restore correct power and wiring before replacing sensor |
| Output stuck at 4 mA (no vibration) | Sensor not sensing vibration or mechanical seizure | ✅ High | Check if machine is running; verify sensor mounting contact with bearing housing | Re-mount sensor or verify machine vibration before replacing |
| Output noisy or unstable | Loose 2-pin connection, poor shield grounding, or EMI | ✅ High | Inspect 2-pin connector tightness; verify shield grounded at one end only; check for nearby EMI sources | Fix connector/shielding and re-test signal |
| Output does not match expected vibration level | Wrong input card scaling or mounting issues | ✅ Medium | Verify input card scaling for 4–20 mA to velocity conversion; check mounting torque (4–7 N·m) | Adjust card scaling or re-mount sensor with proper torque |
| Output drifts over time | Temperature extremes or sensor aging | ❌ Low | Monitor operating temperature (-40°C to +85°C); compare with reference sensor | Replace sensor if drift exceeds ±1% linearity specification |
| Sensor case corroded or 2-pin connector damaged | Harsh environment or physical damage | ❌ Low | Inspect 316L case and 2-pin connector for corrosion or cracks | Replace sensor if physical damage is evident |
Contact technical support with photos of the sensor label, 2-pin wiring, mounting, supply voltage readings, and input card current readings if the fault is still unclear.
Frequently Asked Questions
Can I use 330500-02-CN as a direct replacement for an older Velomitor sensor?
Yes. The 330500 series is the standard Velomitor Piezo-Velocity Sensor line. The -02-CN suffix adds 2-pin connection and China-specific agency approvals, making it compatible with existing Velomitor installations that require CN certifications.
Is this sensor hot-swappable?
This is a standalone piezo velocity sensor with 4–20 mA current loop output, not a rack module. You can disconnect and reconnect it, but you should consider whether the input card is live and follow your site’s electrical safety procedure when handling live 4–20 mA loops.
What machines is this sensor best suited for?
It is especially suited for rotating machinery with rolling-element bearings, including steam turbines, motors, pumps, and compressors. It measures casing/bearing vibration in velocity units via 4–20 mA current loop.
Why is the CN suffix important?
The CN approx indicates China-specific agency approvals, which are required for customers in China who need localized certifications for installation and compliance with Chinese industrial standards.
Why is surplus stock cheaper than factory new?
Surplus parts often come from excess inventory, decommissioned systems, or channel stock. The price is lower, but you still need a clear test record and condition statement (New Original, New Surplus, or Refurbished tested).
What condition should I expect on a surplus unit?
For a credible sale listing, state whether it is New Original, New Surplus, or Refurbished (tested). Buyers in this market want the truth up front, not a vague “used” label.
Does this part fail often?
Not usually. More often, wiring faults, loose 2-pin connection, poor shield grounding, input card scaling mismatch, or mounting issues cause the fault. Always verify wiring, connector tightness, supply voltage (12–30 Vdc), and card scaling before replacing the sensor.
