Bently Nevada 330500-01-04 330500 Piezo-Velocity Sensor

Product Overview

The Bently Nevada 330500-01-04 is a Velomitor Piezo-Velocity Sensor designed for measuring absolute vibration velocity (relative to free space) of bearing housings, machine casings, and structural components.

Key Specifications

• Manufacturer: Bently Nevada (Baker Hughes)
• Product Family: Velomitor Piezo-Velocity Sensor
• Type: Piezoelectric Velocity Transducer
• Mounting Thread Adapter: 1/2-20 UNF (01)
• Agency Approval: Multiple approvals (04) — CSA, ATEX
• Measurement Type: Absolute vibration velocity (relative to free space)
• Sensitivity: 3.94 mV/mm/s (100 mV/in/s) ±5% at 80 Hz
• Frequency Response: 2.0 Hz to 1.0 kHz (±3 dB)
• Transverse Sensitivity: < 5% of axial
• Output Impedance: < 100 Ω
• Power Requirements: 18 to 30 VDC, 2 to 10 mA
• Shock Limit: 5000 g peak
• Operating Temperature: -40°C to +121°C (-40°F to +250°F)
• Storage Temperature: -40°C to +120°C (-40°F to +248°F)
• Humidity: 95% non-condensing
• Case Material: 316L stainless steel
• Connector: 2-pin Mil-C-5015, hermetically sealed, 316L stainless steel shell
• Dimensions: Height 63.2 mm (2.49 in) × Diameter 25.3 mm (0.995 in)
• Weight: ~142 g (5.0 oz)
• Mounting Torque: 32–46 kg-cm (24–40 in-lb) maximum
• Polarity: When case motion is toward the connector, Pin A is positive with respect to Pin B
• Protection Rating: IP65 (hermetically sealed)

Installation Guide

1. Mounting Surface Preparation: Machine a flat, smooth mounting surface on the bearing housing or machine casing. Surface roughness should be Ra 3.2 µm or better.
2. Mounting Hole: Drill and tap a 1/2-20 UNF threaded hole to a depth of at least 12 mm. Ensure the hole is perpendicular to the mounting surface.
3. Sensor Installation: Apply a thin film of anti-seize compound to the threads. Thread the sensor into the mounting hole by hand until snug. Torque to 32–46 kg-cm (24–40 in-lb) maximum. Do not exceed maximum torque.
4. Orientation: Install the sensor so the connector faces the direction of primary vibration measurement. The sensor measures vibration along its longitudinal axis.
5. Cable Connection: Connect the 2-pin Mil-C-5015 connector using a compatible cable (e.g., Bently Nevada 84661 series). Ensure the connector is fully seated and locked.
6. Cable Routing: Route the cable away from high-voltage power lines and motor drives. Maintain minimum 300 mm separation. Use cable clamps to prevent strain on the connector.
7. Grounding: Ground the cable shield at the monitoring system end only. Do not ground at both ends to avoid ground loops.
8. Verification: After installation, verify the sensor output responds to machine vibration. Check for stable baseline and proper signal polarity.

FAQ

Q: What does the model code 330500-01-04 mean?
A: 330500 = Velomitor Piezo-Velocity Sensor; 01 = 1/2-20 UNF mounting thread adapter; 04 = multiple agency approvals (CSA, ATEX).

Q: What is the difference between a Velomitor and an accelerometer?
A: The Velomitor outputs a velocity signal (mV/mm/s) directly, integrating the acceleration signal internally. An accelerometer outputs acceleration (mV/g). The Velomitor is preferred for bearing housing vibration monitoring per ISO 10816 standards.

Q: Can I use this sensor in a hazardous area?
A: Yes. The -04 suffix indicates CSA and ATEX approvals. Verify the specific Ex rating on the sensor label against your area classification. Install with appropriate intrinsic safety barriers if required.

Q: What cable should I use with this sensor?
A: Use Bently Nevada 84661 series cables or equivalent 2-conductor shielded cables with Mil-C-5015 connectors. Cable length can be up to 305 meters (1000 feet) without signal degradation.

Q: What is the expected service life?
A: The solid-state piezoelectric design has no moving parts. With proper installation, service life exceeds 10 years in typical industrial environments.

Selection Tips

• Verify the mounting thread on your machine housing before ordering. Common options: 01 = 1/2-20 UNF, 02 = M8×1, 03 = 1/4-28 UNF, 06 = 5/8-18 UNF, 07 = 3/8-16 UNC.
• Verify agency approvals required for your installation: -00 = none, -01 = CSA only, -04 = multiple (CSA, ATEX), -02 = ATEX only.
• For high-temperature applications (>121°C), consult Bently Nevada for high-temperature Velomitor options.
• Ensure the monitoring system accepts velocity inputs (mV/mm/s). If your system requires acceleration, consider an accelerometer instead.
• When replacing a failed sensor, match the exact model number to ensure identical mounting thread, approvals, and electrical characteristics.