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Configured for seismic vibration monitoring in machine protection platforms, the Bently Nevada 330500-00-00 (330500-00-00 Piezo-velocity Sensor) provides direct physical execution of acceleration-to-velocity signal conversion.

Hardware Specifications

Parameter Specification
Model 330500-00-00
Brand Bently Nevada
Origin USA
Weight 2.0 kg (shipping weight)
Dimensions 63.2 mm height, 25.3 mm diameter
Operating Temp -55 deg C to +121 deg C
Power Consumption Loop-powered via vibration monitor
Mounting Torque 46 kg cm (40 in-lb) max.

Rotor Dynamics and Signal Integrity

The 330500-00-00 sensor utilizes an internal piezoelectric element to convert mechanical casing acceleration into a velocity-proportional electrical signal. Unlike eddy-current displacement sensors that necessitate precise gap voltage validation (-10 VDC targets) to determine shaft relative position, this Velomitor provides a continuous output reflecting absolute seismic intensity. To maintain measurement fidelity, implement effective cross-talk suppression by utilizing shielded instrumentation cabling. Ensure the cable is routed away from high-power AC lines or variable frequency drive conductors to prevent electromagnetic interference from distorting the low-level signal stream.

Frequently Asked Questions

Q: Does the 316L stainless steel housing provide shielding against electrical interference?

A: Yes, the hermetically sealed stainless steel shell provides environmental durability and contributes to electromagnetic shielding. Ensure the case is properly grounded at the monitor end to maximize noise immunity.

Q: Can the sensor be mounted using a custom adapter?

A: The 330500-00-00 is supplied without a thread adapter. If a custom adapter is utilized, it must be fabricated from rigid materials and machined to maintain a flat, full-contact interface with the machine casing to prevent high-frequency signal attenuation.

Field Installation Guidelines

  1. Machine the mounting surface to a flat, smooth finish to ensure a rigid, full-contact area for the sensor base.
  2. Apply a thin layer of silicone grease to the transducer base to facilitate high-frequency energy transfer at the mounting interface.
  3. Tighten the sensor firmly against the casing, ensuring the 46 kg cm (40 in-lb) maximum torque limit is not exceeded.
  4. Route the 2-pin Mil-C-5015 connector cable away from high-current conductors and switching power supplies to mitigate induced electrical noise.
  5. Verify the bias voltage at the monitoring system input terminals during commissioning to ensure the transducer is correctly energized.

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