Bently Nevada | 990-04-70-02-00 990 Vibration Transmitter

Overview

The Bently Nevada 990-04-70-02-00 Vibration Transmitter is a high-performance solution designed to monitor machinery health and performance with exceptional precision. Featuring non-contacting 3300 NSv Proximity Probes, this transmitter provides reliable vibration monitoring in a wide range of industrial applications. It operates on a 4-20 mA output signal, ensuring compatibility with various monitoring and control systems.

Features

• Probe Tip Material: Polyphenylene sulfide (PPS)
• Probe Case Material: AISI 303 or 304 stainless steel (SST)
• Probe Cable: 75Ω coaxial, fluoroethylene propylene (FEP) insulated
• Optional Cable Armor: Flexible AISI 302 SST with optional FEP outer jacket
• Mounting Option: Bulkhead screws for secure installation
• Full-Scale Range: 0-4 mils pp (0-100 µm pp)
• System Length Option: 7.0 meters (23.0 feet)
• Current Limiting: 23 mA typical
• Tensile Strength: 222 N (50 lbf) between probe case and lead
• Agency Approval Option: None required
• Weight: 0.82 kg
• Power Supply: +12 to +35 Vdc

Technical Specifications

• Brand: Bently Nevada
• Model: 990-04-70-02-00
• Output Signal: 4-20 mA in a 2-wire configuration
• Loop Resistance: Maximum 1,000 Ω at 35 Vdc
• Accuracy: ±1.5% over full-scale range, excluding probe factor
• Probe Gap: Between 0.5 mm and 1.75 mm (20 and 55 mils) from target
• Zero and Span: External non-interacting adjustments
• Signal Defeat: Goes below 3.6 mA within 100 µs after “Not OK” condition

FAQ

Q: What is the probe gap required for the Bently Nevada 990?
A: The probe must be gapped between 0.5 mm and 1.75 mm (20 and 55 mils) from the target to ensure accurate readings.

Q: What is the maximum loop resistance for this vibration transmitter?
A: The maximum loop resistance is 1,000 Ω, including the cable at 35 Vdc.

Q: Can I use the Bently Nevada 990 with other probes?
A: No, the 990 Vibration Transmitter is designed specifically to work with non-contacting 3300 NSv Proximity Probes and extension cables.

Q: How do I calibrate the zero and span settings?
A: The transmitter has non-interacting external adjustments for zero and span calibration.

Q: What happens if there is a “Not OK” condition?
A: The signal output will drop below 3.6 mA within 100 µs of the “Not OK” condition. It will return to normal within 2-3 seconds once the condition is resolved.

For more detailed information:990 Vibration Transmitter Datasheet