Bently Nevada 3305/25-02

Product Name
330525 Velomitor XA Piezo-velocity Sensor, 100 mV/in/s, weatherproof connector, ¼-28 UNF mount
Product Introduction
The 330525-02 is a ruggedized, solid-state piezo-electric velocity sensor that merges an accelerometer and an internal integrating amplifier to deliver a direct velocity signal. The laser-welded 316 L stainless-steel capsule and IP65/NEMA 4X-rated weatherproof connector allow the sensor to be mounted without an external junction box, cutting installation cost and panel space. It is purpose-built for continuous casing-vibration monitoring on critical rotating and reciprocating machines that are exposed to wash-down, rain, salt-laden or high-humidity atmospheres.
Technical Specifications
  • Sensing Principle: Compression-mode piezo-ceramic with internal integration
  • Sensitivity: 3.94 mV/mm/s (100 mV/in/s) ±5 %
  • Velocity Range: 0 – 1 270 mm/s (0 – 50 in/s) peak
  • Frequency Response: 4.5 Hz – 5 kHz (±3 dB)
  • Mounted Resonant Frequency: ≥30 kHz
Category:
Description
  • Transverse Sensitivity: ≤5 % of axial
  • Broad-band Noise Floor: 0.25 mm/s (0.01 in/s) rms
  • Supply Requirement: 18 – 30 V dc, 2 – 10 mA constant-current IEPE
  • Output Bias Voltage: 10 – 14 V dc
  • Operating Temperature: –40 °C to +125 °C (–40 °F to +257 °F)
  • Shock Survivability: 5 000 g peak
  • Ingress Protection: IP65 / NEMA 4X when mated
  • Housing Material: 316 L stainless steel, case-isolated
  • Mounting Thread: ¼-28 UNF integral stud
  • Connector: 2-pin, male, weatherproof, gold-plated contacts
  • Weight: 150 g (5.3 oz)
  • Agency Approvals: ATEX / IECEx Ex ia IIC T4 Ga, CSA Class I Div 1, CE, RoHS

Functional Features
  • Weatherproof XA Design: Eliminates the need for a separate weather-proof enclosure, reducing installed cost by up to 30 %.
  • Solid-state Construction: No moving parts, zero maintenance, >20-year MTBF.
  • Case-isolated & Hermetic: Blocks ground-loop currents and withstands 100 % condensing humidity or salt fog.
  • Wide Frequency Range: Captures both low-speed imbalance (4.5 Hz) and high-frequency bearing impacts (5 kHz) in one sensor.
  • IEPE Output: Two-wire, constant-current powered; direct connection to 3500/42M, 1900/65A, 2300/20 monitors.
  • Reverse-polarity & Short-circuit Protected: Survives wiring errors during commissioning.
  • Drop-in Interchangeability: Shares ¼-28 UNF mounting and MIL-C-5015 footprint with standard Velomitor units.
Application Scenarios
  • Outdoor cooling-tower fan gearboxes exposed to rain and wash-down
  • Offshore platform gas-compressor skids in salt-laden atmospheres
  • Petrochemical pump jacks with daily hose-down requirements
  • Paper-mill dryer sections operating under high humidity and chemical vapours
  • Steel-mill reversing-stand gearboxes subject to steam and scale
  • Power-plant condenser cooling-water pumps in river-side intake structures
  • Wind-turbine nacelles without additional environmental enclosures
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