Product Core Brief

• Model: 330500-00-04/CN
• 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 | No mounting thread | CN 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 330500-00-04/CN 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	00	No mounting thread (smooth base)
Approval	04/CN	CN approval (Chinese 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 “00” thread option means the sensor has a smooth base without a threaded stud, which may require a different mounting arrangement compared to threaded versions (e.g., 01 = 1/2-20 UNF, 02 = M8×1, 04 = 1/4-20 UNC).

 

Key Technical Specifications

Parameter	Value
Product Type	Piezo-velocity sensor (Velomitor)
Brand	Bently Nevada (Baker Hughes)
Model	330500-00-04/CN
Sensitivity	100 mV/in/s (3.94 mV/mm/s) ±5%
Frequency Range	4.5 Hz–5 kHz (±3.0 dB)
Mounting Thread	None (smooth base)
Approval	CN (Chinese approval)
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)

1. Part-number verification: Confirm 330500-00-04/CN on the sensor label or packaging.
2. Visual inspection: Check the stainless steel housing for dents, corrosion, or cracks.
3. Connector inspection: Verify the 2-pin connector for pin damage, seal integrity, and corrosion.
4. Label verification: Confirm the CN approval marking matches site certification requirements.
5. Base inspection: Since this is a “00” (no thread) version, verify the smooth base is flat and undamaged for proper mounting.
6. 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 “00” means no mounting thread. If the existing installation requires a threaded stud (e.g., 1/2-20 UNF or M8×1), a “00” version will not fit without an adapter.

Confirm the approval suffix. The 04/CN approval denotes Chinese approval. Substituting 00 (no approval), 01 (CSA/NRTL/C), or 02 (CENELEC) 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 330500-00-04/CN	Same 330500-00-04/CN	Direct	Match full order code, thread option, and approval.
Bently Nevada 330500-01-04/CN	330500-00-04/CN	Needs Verification	Different thread (1/2-20 UNF vs. none); verify mounting compatibility.
Bently Nevada 330500-02-04/CN	330500-00-04/CN	Needs Verification	Different thread (M8×1 vs. none); verify mounting compatibility.
Bently Nevada 330500-00-00	330500-00-04/CN	Needs Verification	Different approval (00 no approval vs. CN); verify site certification needs.
Bently Nevada 330500-00-04	330500-00-04/CN	Needs Verification	Approval format may differ; confirm CN marking on label.
Bently Nevada 330525-00-04/CN	330500-00-04/CN	Needs Verification	330525 is the environmentally enhanced (XA) version with NEMA 4X/IP65 rating; verify environmental requirements.
Bently Nevada 9200	330500-00-04/CN	Needs Verification	9200 is a moving-coil velocity sensor; 330500 is piezo-velocity. Verify monitor compatibility.
Bently Nevada 330171-00-10-10-02-05	330500-00-04/CN	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.
• No mounting thread (smooth base).
• CN 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.