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The 990-04-70-01-00 is a loop-powered, 2-wire vibration transmitter that combines the functions of a proximity sensor and a signal conditioner into a single module. It processes raw input from a non-contacting proximity probe to output a 4 to 20 mA direct current signal proportional to radial vibration amplitude. This output interfaces with standard industrial programmable logic controllers (PLCs), distributed control systems (DCS), or SCADA networks for trending and machinery monitoring.
Non-interacting zero and span potentiometers under the Transmitter label supports loop adjustment
Test Input pin for quick verification of loop signal output, using a function generator as the input
A Not OK/Signal Defeat circuit prevents high outputs or false alarms due to a faulty proximity probe or loose connection
The 990 Vibration Transmitter is used for centrifugal air compressors, small pumps, motors, or fans to provide a 4 to 20 mA proportional vibration signal as the input to a machinery control system. The transmitter is a two-wire, loop-powered device that accepts input from a 3300 NSv proximity probe and its matching extension cable in 5-meter or 7-meter system length options.
The transmitter conditions the raw transducer signal into peak-to-peak vibration amplitude engineering units. It provides this value as a proportional 4 to 20 mA industry-standard signal to the control system where machinery protection alarming and logic occurs. This device operates as a utility for measuring general vibration levels and overall vibration trending.
The transmitter provides limited functions for machinery diagnostics using the vibration signal and does not capture dynamic vibration signals in the event of a vibration alarm. While the transmitter executes peak vibration alarming and non-OK checking, the 4 to 20 mA signal does not determine the phase of vibration. Monitor functions including gap alarms, phase alarms, Timed OK channel defeat, Danger Bypass, and Trip Multiply are not available. Programmable Logic Controllers (PLCs) attached to the vibration transmitter receive peak-to-peak trending data and do not interface with plant-wide diagnostic networks such as System 1 or Rule Paks.
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description.
Bently Nevada 990-04-70-01-00 Vibration Transmitter Manuals, Datasheets, Drivers, Link
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description.
Petroleum Refining
Installed on fluid-film bearings of small-to-medium rotating pumps at the bottom of crude distillation columns to monitor radial relative shaft vibration on-site, preventing mechanical seal failures and leakage caused by wear.
Thermal Power Generation
Deployed on the bearing housings of boiler vertical condensate pumps and feedwater booster pumps to measure axial relative shaft displacement, preventing physical friction and collision between internal pump impellers and casings.
Coal Chemical Industry
Applied to lean liquor circulation pumps and small-to-medium centrifugal fans in Rectisol units; its 2-wire loop-powered configuration simplifies safety wiring outside the explosion-proof cabinet.
Iron and Steel Smelting
Installed on pump sets at blast furnace blower auxiliary lubricating oil stations, utilizing its DIN-rail mounting form factor inside control boxes to deliver shaft mechanical behavior data within environments filled with high heat accumulation and dust.
Hydropower Industry
Used on guide bearings of small-to-medium bulb hydro-generator units to monitor shaft swing; the PROX interface on the transmitter panel allows maintenance personnel to connect external analyzers for diagnosing rotor faults easily.
The 990-04-70-01-00 is a 2-wire loop-powered device requiring the external DC power supply to be strictly maintained within 12 to 35 volts during field wiring, as a supply voltage more positive than 12 VDC will prevent full-scale 20 mA output.
When mounting the probe, the initial static gap voltage must be monitored via the faceplate GAP test pins and precisely adjusted between 2.5 and 4.5 VDC to ensure the transmitter operates at its linear midpoint.
When connecting the probe lead, it must be firmly locked using the integral coaxial connector and routed away from high-power cables, while the shield layer must be single-point grounded at the control cabinet side to prevent high-frequency electromagnetic interference from inducing spikes in the 4-20 mA signal.
The Bently Nevada 990-04-70-01-00 is an industrial-grade, 2-wire eddy current proximity transmitter for small-to-medium fluid-film bearing rotating machinery, supporting DIN-rail mounting. It linearly converts non-contact shaft displacement within a 70 mil range into a standard 4-20 mA current output and features local GAP test pins alongside a PROX dynamic signal interface for direct connection to PLC or DCS vibration monitoring loops.
This is a 990 series 2-wire eddy current proximity transmitter manufactured by Bently Nevada, specifically designed to linearly convert the non-contact, micron-level displacement variations of a proximity probe into an industry-standard 4 to 20 mA current signal.
What primary measurement tasks does the 990-04-70-01-00 execute on-site?
It is primarily used for measuring the fluid-film bearing relative shaft vibration or monitoring the axial thrust displacement of small-to-medium rotating machinery.
Which specifications of proximity probe must the 990-04-70-01-00 pair with to operate properly?
It must be paired with a standard Bently Nevada 3300 XL 8 mm proximity probe or an older 3300 8 mm probe.
What approval option does the suffix 00 represent for the 990-04-70-01-00?
The 00 indicates that specific international hazardous area or intrinsic safety approvals are not required, making this configuration suitable for standard non-hazardous safe areas.
What material is the housing of the 990-04-70-01-00 made of?
Its housing is entirely manufactured from rugged, corrosion-resistant zinc casting paired with a non-conductive polycarbonate top cover.
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