Bently Nevada 330500 Velomitor® Series Piezoelectric Velocity Sensor in stock

This series is specifically designed for measuring absolute vibration (relative to free space) of bearing housings, casings, or structures. It is a sensor that uses a piezoelectric crystal to sense vibration and outputs a signal proportional to velocity. Its core advantage lies in its solid-state design with no moving parts, which eliminates mechanical wear, allows mounting in any orientation, and provides extremely high reliability.

Model Number Breakdown

The 330500 series sensors follow the model numbering convention 330500-AXX-BXX.

Code Position Option Meaning

AXX (Mounting Thread) 01 1/2-20 UNF Imperial Thread

02 M8 × 1 Metric Thread

BXX (Certification Option) 00 No Hazardous Area Certification

05 Multiple International Certifications (e.g., CSA, ATEX)

Based on the above rules, the specific models you inquired about have the following meanings:

330500-01-00: 1/2-20 UNF thread, no certification.

330500-02-00: M8×1 metric thread, no certification.

330500-02-05: M8×1 metric thread, with hazardous area certification.

Series Technical Specifications

The main technical parameters of this sensor series are as follows:

Parameter Specification

Sensitivity 100 mV/in/s (3.94 mV/mm/s) ±5%

Velocity Range 1270 mm/s (50 in/s) peak

Frequency Response 4.5 Hz to 5 kHz (±3.0 dB)

6.0 Hz to 2.5 kHz (±0.9 dB)

Mounting Resonant Frequency > 12 kHz

Transverse Sensitivity < 5%

Operating Temperature -55°C to +121°C

Housing Material 316L Stainless Steel, Hermetically Sealed

Connector Type 2-pin MIL-C-5015 Hermetic Connector

Weight Approx. 150 grams

Maximum Cable Length 305 meters (no signal attenuation)

Key Features & Applications

Technical Positioning: The 330500 series is a velocity sensor; its output signal directly represents vibration velocity. In contrast, the 330400 series you inquired about earlier is an accelerometer, whose output represents vibration acceleration. The 330500 is more suitable for monitoring the overall vibration energy of machinery.

Core Advantage: The solid-state design makes it extremely rugged and durable. It contains no spring or mass structure found in moving-coil velocity sensors (such as Bently Nevada's 9200, 74712 series), thus eliminating failures due to mechanical wear.

Typical Applications: Widely used for online casing vibration monitoring of rotating machinery such as steam turbines, compressors, fans, motors, and pumps. It is typically used in conjunction with Bently Nevada monitoring systems such as the 3500/42M and 1900/65A.