Product Core Brief
- Model: 330500-02-04
- Brand: Bently Nevada (Baker Hughes)
- Series: 330500 Velomitor Piezo-Velocity Sensor
- Core Function: Integrating piezo-velocity sensor for absolute casing/bearing housing vibration measurement in velocity units.
- Product Type: Piezo-velocity sensor (Velomitor)
- Key Specs: 100 mV/in/s (3.94 mV/mm/s) sensitivity | 4.5 Hz–5 kHz frequency range | M8×1 mounting thread | 04 multi-license approval | Up to 305 m cable length
- Condition: New Surplus / Factory New (confirm label, connector condition, and approval marking before procurement)
Product Introduction
The Bently Nevada 330500-02-04 is a Velomitor piezo-velocity sensor used for measuring absolute vibration of bearing housings, casings, or structures. Unlike traditional moving-coil velocity sensors, it uses a piezoelectric accelerometer with an integrated integrator circuit, so there are no moving parts to wear out.
The model code breaks down as follows:
| Segment | Value | Meaning |
|---|---|---|
| Base model | 330500 | Velomitor piezo-velocity sensor |
| Mounting thread | 02 | M8×1 mounting thread |
| Approval | 04 | Multi-license approval |
This sensor is typically installed on machines with rolling-element bearings where velocity units are most useful for condition monitoring, such as motors, pumps, fans, compressors, and gearboxes. It outputs a voltage signal proportional to vibration velocity, which can be connected to Bently Nevada 3500 monitoring systems (e.g., 3500/42M) or compatible vibration monitors such as the 1900/65 series.
The 330500 series is a solid-state sensor that can be mounted vertically, horizontally, or at any angle. The “02” thread option means the sensor uses an M8×1 metric thread, which is common in European and international installations. The “04” approval option indicates multi-license certification, which may cover multiple regional standards.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Product Type | Piezo-velocity sensor (Velomitor) |
| Brand | Bently Nevada (Baker Hughes) |
| Model | 330500-02-04 |
| Sensitivity | 100 mV/in/s (3.94 mV/mm/s) ±5% |
| Frequency Range | 4.5 Hz–5 kHz (±3.0 dB) |
| Mounting Thread | M8×1 |
| Approval | 04 (multi-license) |
| Max Cable Length | Up to 305 m (1,000 ft) |
| Operating Temperature | −55 °C to +121 °C |
| Housing Material | 316L stainless steel |
| Typical Applications | Casing vibration, bearing housing vibration, rolling-element bearing machines |
Data sourced from Baker Hughes official documentation and third-party technical references. Exact specifications should be confirmed against the product label and OEM datasheet.
Quality Control Process (DYNAMIC GENERATION)
- Part-number verification: Confirm 330500-02-04 on the sensor label or packaging.
- Visual inspection: Check the stainless steel housing for dents, corrosion, or cracks.
- Connector inspection: Verify the 2-pin connector for pin damage, seal integrity, and corrosion.
- Label verification: Confirm the 04 (multi-license) approval marking matches site certification requirements.
- Thread inspection: Since this is a “02” (M8×1) version, verify the M8×1 thread is undamaged and free of cross-threading.
- Cable check: Inspect the attached cable (if any) for jacket damage or connector issues.
Replacement Pitfall Guide (DYNAMIC GENERATION)
❗ Do not confuse 330500 with 330180 or 330171. The 330500 is a casing vibration velocity sensor, while 330180 is a proximity probe proximitor and 330171 is a proximity probe. They measure completely different parameters and are not interchangeable.
❗ Verify the mounting thread option. The “02” means M8×1 metric thread. If the existing installation requires a different thread (e.g., 1/2-20 UNF or no thread), this version will not fit without an adapter.
❗ Confirm the approval suffix. The 04 approval denotes multi-license certification. Substituting 00 (no approval), 01 (CSA/NRTL/C), 02 (CENELEC), or CN should be verified against site certification requirements.
❗ Check the frequency range. The standard 330500 covers 4.5 Hz–5 kHz. For lower-frequency applications (e.g., cooling towers below 90 rpm), consider the 330505 or 190501 series instead.
❗ This is not a shaft vibration sensor. The 330500 measures absolute casing vibration, not relative shaft vibration. It should not be substituted for 3300 XL proximity probes.
❗ Verify cable compatibility. The 330500 uses a 2-pin connector. Compatible cables include Bently Nevada part numbers 9571 (standard) and 84661 (armored).
Compatibility Matrix & Benchmarks
| Original Model | Replacement / Alternative | Compatibility Level | Migration Notes |
|---|---|---|---|
| Bently Nevada 330500-02-04 | Same 330500-02-04 | Direct | Match full order code, thread option, and approval. |
| Bently Nevada 330500-02-00 | 330500-02-04 | Needs Verification | Different approval (00 no approval vs. 04 multi-license); verify site certification needs. |
| Bently Nevada 330500-02-CN | 330500-02-04 | Needs Verification | Different approval (CN vs. 04 multi-license); verify site certification needs. |
| Bently Nevada 330500-01-04 | 330500-02-04 | Needs Verification | Different thread (1/2-20 UNF vs. M8×1); verify mounting compatibility. |
| Bently Nevada 330500-00-04 | 330500-02-04 | Needs Verification | Different thread (none vs. M8×1); verify mounting compatibility. |
| Bently Nevada 330525-02-04 | 330500-02-04 | Needs Verification | 330525 is the environmentally enhanced (XA) version with NEMA 4X/IP65 rating; verify environmental requirements. |
| Bently Nevada 9200 | 330500-02-04 | Needs Verification | 9200 is a moving-coil velocity sensor; 330500 is piezo-velocity. Verify monitor compatibility. |
| Bently Nevada 330171-00-10-10-02-05 | 330500-02-04 | Not direct | 330171 is a shaft proximity probe; 330500 is a casing velocity sensor. |
Benchmarks:
- Velomitor piezo-velocity sensor for absolute casing/bearing housing vibration.
- 100 mV/in/s (3.94 mV/mm/s) sensitivity.
- 4.5 Hz–5 kHz frequency range.
- M8×1 mounting thread.
- 04 (multi-license) approval.
- Compatible with 3500/42M and 1900/65 series monitors.
- Third-party listings that describe 330500 as a proximity probe, proximitor, or 4–20 mA transmitter are incorrect.
