Velomitor Piezo-velocity Sensor | 330500-00-20 | Bently Nevada

Technical Specifications

Bently Nevada Velomitor Piezo-velocity Sensors are designed to measure absolute (relative to free space) bearing housing, casing, or structural vibration. The 330500 is a specialized piezoelectric accelerometer that incorporates embedded integrated electronics in a solid-state design. Because the 330500 incorporates solid-state electronics and has no moving parts, it does not suffer from mechanical degradation and wear, and can be mounted vertically, horizontally, or at any other angle of orientation.

On-site Installation and Maintenance Tips

Installation Torque Limit: When screwing the sensor threads into the base, the maximum installation torque should not exceed 4.52 N-m (40 in-lbf). Excessive torque can damage the internal piezoelectric ceramic crystal, causing permanent drift in sensor sensitivity.

Physical Materials and Environment: The housing is hermetically sealed in 304L stainless steel, supporting operating temperatures from -55 °C to +121 °C, and possesses an exceptional shock and vibration survivability of 5,000 g.

Common Wiring Connections: In the 3500 system, it is typically connected to the Velomitor dedicated channel input of the 3500/42M monitoring module via a 2-core twisted-pair shielded cable (such as Bentley 02173006 or 175873 cable).

Resonance Avoidance in Mechanical Installation

Rigid Connection Requirements: To ensure the resonance point is well above the machine's highest monitoring frequency (5 kHz), the sensor mounting surface must be flat, with a recommended roughness of Ra 1.6 μm, and a maximum tightening torque of 4.52 N-m (40 in-lbf) must be strictly adhered to.

Gasket Prohibition: When installing 330500-00-20, it is strictly forbidden to install any spring washers or rubber gaskets between the sensor and the bearing housing surface. These improper insulation or anti-loosening washers will significantly reduce the overall installation rigidity, causing the sensor's mechanical resonance frequency to drop directly to within 1 kHz or even several hundred hertz, thus triggering severe "false high vibration alarms" or even false tripping during unit operation.

Technical FAQ

Q: What is the standard output sensitivity of the 330500-00-20?

A: The standard sensitivity is 3.94 mV/mm/s (or 100 mV/in/s) ±5%.

Q: What is the frequency response range of the 330500-00-20?

A: The response is ±3.0 dB from 4.5 Hz to 5 kHz, and ±0.9 dB from 6.0 Hz to 2.5 kHz, ensuring high measurement accuracy.

Q: What is the maximum vibration velocity range supported by the 330500-00-20 sensor?

A: The peak velocity can reach up to 1270 mm/s (50 in/s).

Q: What is the output bias voltage of the 330500-00-20?

A: The normal DC output bias voltage is -12 ±3.0 Vdc.

Q: What material is used for the 330500-00-20 housing, and is it corrosion resistant?

A: The housing is made of 316L stainless steel with a laser hermetically sealed structure, providing 100% resistance to moisture and mild corrosion.

Q: Are your products brand new?
A: Yes. We only supply 100% original and brand-new products. All items are sourced through authorized channels and have never been used or refurbished.

Q: Why can customers buy with confidence?
A: Because every product is backed by our 1-Year Warranty Guarantee of Quality, ensuring reliability, customer satisfaction, and long-term support after delivery.

Q: Do you provide international shipping?
A: Yes. We ship products to customers worldwide using reliable international logistics services such as EMS, DHL, UPS, and FedEx.

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