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Phone: +86 16626708626Description
Key Technical Specifications
- Model: 330500-00-20
- Manufacturer: Bently Nevada
- Product family: 330500 Velomitor
- Sensor type: Piezoelectric velocity sensor
- Measured quantity: Absolute vibration velocity
- Sensitivity: 100 mV/in/s, 3.94 mV/mm/s
- Frequency response: 4.5 Hz to 5 kHz ±3 dB; 6.0 Hz to 2.5 kHz ±0.9 dB
- Connector: 2-pin MIL-C-5015 style
- Housing material: 316L stainless steel
- Operating temperature: -55 C to +121 C
- Maximum velocity range: 50 in/s peak
- Mounting: Threaded installation, orientation flexible
Product Introduction
Bently Nevada 330500-00-20 is a Velomitor velocity sensor used for absolute vibration monitoring on bearing housings, machine casings, and structural points. It fits rotating machinery applications such as motors, pumps, compressors, and steam turbines.
This unit uses solid-state piezoelectric construction with no moving parts, which keeps maintenance low and reduces wear-related drift. The 2-pin interface and wide temperature range make it a practical replacement when the installed machine expects a direct vibration velocity sensor.
- 330500-00-20
Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| No vibration signal at analyzer input | Open cable, bad connector, or failed sensor | ✅ High | Measure sensor loop continuity and check connector pins with a multimeter | Verify cabling and mating connector before replacing the sensor |
| Output reads flatline near 0 | Power or readout issue, not always sensor failure | ⚠️ Medium | Check analyzer input supply, channel enable, and termination | Confirm the monitor channel is healthy first |
| Excessive noise or unstable reading | Loose mounting, grounding issue, or cable damage | ✅ High | Inspect mounting torque, shield termination, and cable routing | Re-mount correctly and inspect shielding before swap-out |
| Signal present but low amplitude | Wrong sensitivity setting or partial sensor degradation | ✅ High | Compare analyzer scaling to the sensor nameplate and document trend data | Confirm the 100 mV/in/s scaling before condemning the unit |
| Intermittent signal loss | Connector fretting, broken conductor, or vibration at cable entry | ✅ High | Wiggle-test the connector, then perform continuity checks end-to-end | Replace damaged cable set or connector hardware |
| Alarm trip on a healthy machine | Monitor configuration or threshold problem | ❌ Low | Review alarm limits, filter settings, and recent configuration changes | Check the monitor setup before blaming the sensor |
Contact technical support with photos of the sensor label, connector, mounting point, and diagnostic logs if the fault is still unclear.
Frequently Asked Questions (FAQ)
Q: Is the 330500-00-20 a direct replacement for every Bently Nevada vibration sensor?
A: No. It is a specific Velomitor velocity sensor, so you need to match the mounting style, connector, sensitivity, and monitor input requirements. Always verify the original part number and wiring before installing a substitute.
Q: Can I hot-swap this sensor?
A: Not as a rule. On live machinery, pulling a sensor or cable while the system is running can create noise, false alarms, or input faults. De-energize the loop and follow the site procedure first.
Q: Why is this unit cheaper than factory list pricing?
A: In most B2B cases it is sold as New Surplus or New Original stock rather than direct OEM distribution. That lowers cost, but the buyer should still confirm condition, traceability, and test status.
Q: Will my existing monitor accept the 100 mV/in/s output?
A: Usually yes if the channel is configured for a Velomitor-type velocity input, but you should confirm the scaling and input impedance. A wrong setup can look like a bad sensor when the hardware is fine.
Q: What should I check before replacing the sensor?
A: Check the cable continuity, connector pins, mounting torque, and analyzer channel first. A lot of “bad sensor” calls end up being wiring, grounding, or configuration issues.
Q: Is this item new or refurbished?
A: The listing should be treated as New Original / New Surplus unless the seller states otherwise. If the seller cannot provide traceability, test records, or clear condition photos, do not assume refurbished or factory-new status.
Q: Can this be used on pumps and compressors?
A: Yes, that is a common use case. It is used for absolute vibration monitoring on rotating equipment, especially where bearing housing vibration is the main maintenance signal.
