330500-07-04 | Bently Nevada Velomitor Piezo-velocity Sensor

Product Overview

The Bently Nevada 330500-07-04 is a Velomitor Piezo-Velocity Sensor featuring a 3/8-16 UNC mounting thread and multiple agency approvals (CSA, ATEX).

Key Specifications

• Manufacturer: Bently Nevada (Baker Hughes)
• Product Family: Velomitor Piezo-Velocity Sensor
• Type: Piezoelectric Velocity Transducer
• Mounting Thread Adapter: 3/8-16 UNC (07)
• 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 +100°C (-40°F to +212°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
• Protection Rating: IP65 (hermetically sealed)

Installation Guide

1. Mounting Surface: Prepare flat, smooth surface. Roughness Ra 3.2 µm or better.
2. Mounting Hole: Drill and tap 3/8-16 UNC to depth of at least 12 mm. Ensure perpendicularity.
3. Sensor Installation: Apply anti-seize. Thread by hand until snug. Torque 32–46 kg-cm (24–40 in-lb) max.
4. Orientation: Connector facing primary vibration direction.
5. Cable: Use 2-pin Mil-C-5015 compatible cable (84661 series). Max cable length: 305 m.
6. Grounding: Ground shield at monitoring system end only.
7. Verification: Confirm output responds to machine vibration.

FAQ

Q: What does 330500-07-04 mean?
A: 330500 = Velomitor; 07 = 3/8-16 UNC mounting thread; 04 = multiple approvals (CSA, ATEX).

Q: Is 3/8-16 UNC a common thread?
A: Yes. 3/8-16 UNC is widely used on North American industrial equipment, particularly pumps and motors.

Q: What is the difference between -07-04 and -01-04?
A: Only the mounting thread differs: -07- = 3/8-16 UNC; -01- = 1/2-20 UNF. Electrical and approval specifications are identical.

Selection Tips

• Verify the existing mounting thread on your machine before ordering. 3/8-16 UNC is imperial; M8×1 is metric.
• For hazardous areas, the -04 suffix provides CSA and ATEX coverage.
• Match exact model number when replacing sensors.