Overview

The Bently Nevada 990-04-50-02-00 is a Vibration Transmitter designed to convert the proximity probe signal into a 4 to 20 mA output for monitoring machinery vibration.

Specifications

• Full-scale Option: 0-4 mils pp (0-100 μm pp)
• System Length Option: 5.0 meters (16.4 feet)
• Mounting Option: Bulkhead screws
• Agency Approval Option: Not required

Electrical

• Input: Accepts 1 non-contacting 3300 NSv Proximity Probe and extension cable
• Power: Requires +12 to +35 Vdc input
• Signal Output: 4 to 20 mAdc in 2-wire configuration
• Loop Accuracy: ±1.5%
• Maximum Loop Resistance: 1,000 Ω at 35 Vdc
• Zero/Span: External adjustments
• Current Limiting: 23 mA typical
• Signal Defeat: Output drops to less than 3.6 mA after a Not OK condition occurs
• Power-up Inhibit: Signal output remains at less than 3.6 mA for 2 to 3 seconds after power is applied

Proximity Sensor

• Probe Gap: 0.5 to 1.75 mm (20 to 55 mils) from target
• Prox Out Incremental Scale Factor: 7.87 mV/μm (200 mV/mil) ±6.5% typical
• Temperature Stability: Scale factor remains within ±10% from 0°C to +70°C (+32°F to +158°F)
• Frequency Response: 5 Hz to 6,000 Hz ±0, 3 dB
• Minimum Target Size: 9.5 mm (0.375 in) diameter
• Leadwire Length: Maximum cable distance for Proximitor Sensor Output (BNC connector) is 3 meters (10 feet)

Environmental Conditions

• Hazardous Area Locations: Non-Hazardous, Zone 2 or Div 2 locations
• Power Supply: 28 V