Product Overview

The 990-10-70-01-00 serves as a high-performance, loop-powered signal conditioner designed to bring professional-grade machinery protection to a broad range of industrial assets. This Bently Nevada 990 series transmitter integrates the functions of a Proximitor sensor and a signal converter into a single, rail-mountable unit. It is specifically engineered to interface with the 3300 NSv (Narrow Side-view) proximity probe system, converting raw eddy current signals into a standardized 4 to 20 mA analog output. This allows plant operators to stream real-time vibration data directly to Programmable Logic Controllers (PLCs) or Distributed Control Systems (DCS) without the need for specialized rack-mounted monitoring hardware.

Key Technical Characteristics

The 990-10-70-01-00 configuration is optimized for accuracy in compact machinery environments, providing a linear representation of peak-to-peak vibration displacement.

• Model Number 990-10-70-01-00

• Input Transducer 3300 NSv Proximity Probe and Extension Cable

• System Length 10.0 Meters (Option -10)

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

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

• Mounting 35 mm DIN-rail clips (Option -01)

• Approval Rating Standard / Non-hazardous area (Option -00)

• Power Requirement Loop-powered (+12 to +35 Vdc)

• Diagnostic Port Buffered "PROX OUT" coaxial BNC and screw terminals for raw signal analysis

• Environmental Protection Robust, potted construction for high-humidity resistance

Industrial Applications

The 990-10-70-01-00 is primarily utilized by Original Equipment Manufacturers (OEMs) and maintenance engineers for the protection of critical rotating equipment. Because it utilizes the 3300 NSv probe—which features a smaller footprint than standard 8mm probes—it is the ideal solution for:

• Centrifugal Air Compressors Monitoring radial vibration in internal gear assemblies and high-speed impellers where space is severely restricted.

• Industrial Pump Systems Providing continuous health data for fluid-handling pumps to prevent seal failure and shaft misalignment.

• Electric Motors and Fans Facilitating automated alarm and shutdown logic via 4-20 mA loops to protect against bearing degradation.

• Predictive Maintenance Offering a buffered output for technicians to perform advanced frequency spectrum analysis with portable data collectors without breaking the protection loop.

By implementing this transmitter, facilities can establish a cost-effective Turbine Supervisory Instrumentation (TSI) strategy that provides both immediate protection and long-term trending of shaft vibration signatures.