Product Details: Bently Nevada 990-04-70-01-00 is a two-wire loop powered Vibration Transmitter of the 990 series, equipped with integrated proximitor circuit and matched with 3300 NSv proximity probe to realize non-contact relative shaft vibration monitoring for rotating machinery. This Shaft Displacement Transducer converts the gap variation between probe tip and rotating metal shaft into standard 4-20mA analog signal output, which can be directly connected to DCS, PLC and other plant control systems without rack-based monitoring modules. According to ordering code 990-04-70-01-00, this transmitter has full measurement range of 0-4 mils peak to peak, the total length of matched transducer system reaches 7 meters, and it adopts 35mm DIN rail clip mounting with no agency certification required. The transmitter is powered by 12~35V DC loop power supply, with zero and span adjustment potentiometers for convenient on-site calibration. It reserves BNC buffered raw signal output for field inspection and equipment troubleshooting. Built-in transducer fault detection circuit can identify probe open circuit, short circuit and poor connector contact, and trigger fault current alarm state. Fully potted internal circuit structure can withstand mechanical vibration, dust and high humidity in industrial environments. The power-up inhibit function prevents false alarms caused by voltage fluctuation during equipment startup. Widely used in power generation, petrochemical and heavy industrial fields, this Two-Wire Loop Powered Transmitter monitors small centrifugal compressors, fans and pumps, tracks rotor vibration trend changes at an early stage, protects bearing components and reduces unplanned equipment shutdown.

Core Attributes:

Brand: Bently Nevada

Model: 990-04-70-01-00

Product Type: Two-wire Vibration Transmitter

Measurement Range: 0-4 mils pp (0~100μm pp)

Matched Probe: 3300 NSv proximity probe

System Cable Length: 7 meters

Power Supply: 12 ~ 35V DC, two-wire loop power

Mount: 35mm DIN rail clip mount

Features: Integrated proximitor circuit, 4-20mA analog output, BNC buffered signal, transducer fault detection, zero & span adjustable, potted circuit construction