Product Overview

The 990-05-70-03-00 is a high-reliability, loop-powered signal conditioner engineered by Bently Nevada to provide continuous vibration monitoring for critical rotating assets. Functioning as a two-wire transmitter, this device interfaces directly with a 3300 NSv proximity probe to measure shaft vibration displacement. It simplifies machinery protection by converting raw eddy current signals into a standardized 4 to 20 mA analog output. This allows plant operators to integrate real-time vibration data into existing PLC or DCS control architectures without the requirement for expensive, rack-mounted monitoring hardware, making it a preferred choice for cost-effective machinery health management.

Key Technical Characteristics

The 990-05-70-03-00 is optimized for precision and ease of field deployment, featuring a compact footprint and robust electrical specifications.

• Model Number 990-05-70-03-00

• Measurement Range 0 to 125 µm (0 to 5 mils) peak-to-peak (Option -70)

• System Length 7.0 Meters (approx. 23.0 feet) (Option -05)

• Transducer Compatibility 3300 NSv Proximity Probe and Extension Cable

• Output Signal 4 to 20 mA DC, proportional to peak-to-peak vibration amplitude

• Power Requirement +12 to +35 Vdc (Loop Powered)

• Mounting Configuration DIN rail clips and screw mount support (Option -03)

• Agency Approvals None / Standard (Option -00)

• Dynamic Signal Port Buffered "PROX OUT" coaxial BNC and terminals for oscilloscope analysis

• Maximum Loop Resistance 1,000 Ω at 35 Vdc

Operational Use Cases

The 990-05-70-03-00 is specifically designed for industrial applications where space is limited or where basic machinery protection is required. Its compatibility with the 3300 NSv (Narrow Side-view) probe makes it ideal for:

• Centrifugal Air Compressors Monitoring radial shaft vibration in small-diameter bearings and high-speed impellers.

• Industrial Pump Systems Providing continuous vibration trending for process pumps to prevent mechanical seal failure.

• Small Motors and Fans Implementing automated alarm and shutdown logic via standard 4-20 mA control loops.

• OEM Equipment Integration Allowing machinery manufacturers to offer built-in vibration reporting as a standard feature.

• Remote Monitoring Transmitting data over long distances through a current loop to a central control room with minimal signal degradation.