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The 990-05-70-03-01 is a 2-wire loop-powered shaft vibration transmitter manufactured by Bently in the USA. It is a cost-effective industrial-grade device that converts mechanical dynamic vibration signals measured by a non-contact probe directly into an industrial-standard 4-20mA analog current signal on-site, and transmits it to a PLC or DCS control system for continuous protection and condition monitoring of rotating machinery.
Integrated Proximitor Sensor requires no external unit
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
The 990 Vibration Transmitter is intended primarily for the original equipment manufacturers (OEMs) of centrifugal air compressors or small pumps, motors, or fans who prefer to provide a simple 4 to 20 mA proportional vibration signal as the input to their machinery control system. The transmitter is a two-wire, loop-powered device that accepts input from our 3300 NSv proximity probe and its matching extension cable (available in 5 m and 7 m system length options). The transmitter conditions the signal into appropriate peak to-peak vibration amplitude engineering units, and provides this value as a proportional 4 to 20 mA industry-standard signal as the input to the control system where machinery protection alarming and logic occurs.
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 990-05-70-03-01 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.
Coal Chemical Industry
Used for economical single-point protection of low-to-medium pressure centrifugal pumps and small methanol process compressors in hazardous areas.
Thermal Power
Monitoring fluid-film bearings of boiler feed pumps, condensate pumps, and forced/induced draft fans, providing 4-20mA analog alarm protection.
Steel & Metallurgical
Monitoring the dynamic shaft vibration of expanders in blast furnace Top-pressure Recovery Turbine (TRT) systems and high-pressure dedusting fans.
Petrochemical & Refining
Monitoring bearing wear trends of small-to-medium rotating equipment, such as process gas compressors and high-risk chemical dosing pumps, with signals routed directly to the DCS.
Pulp & Paper
Monitoring the radial runout of thin input shafts on high-speed rewinders, pulping machines, and dryer section drive gearboxes.
When using the Bently Nevada 990-05-70-03-01 transmitter, you must ensure the total system length (probe + cable + transmitter) strictly equals 7.0 meters, adjust the initial probe gap precisely during installation, and use the side potentiometers to fine-tune the loop for accurate 4-20mA scaling over the 0-5 mils range. Additionally, the loop power must be maintained between +12 and +35 Vdc while carefully matching the loop resistance of barriers and control systems, external terminals must be protected from liquids, and high-impedance analysis instruments must be used when connecting to the PROX OUT diagnostic terminal.
It is a 990 series integrated 2-wire loop-powered vibration transmitter manufactured by Bently Nevada.
What is the core function of 990-05-70-03-01?
It accepts the raw electromagnetic signal from a proximity probe, processes it, and outputs a 4-20mA current signal proportional to the peak-to-peak vibration amplitude.
What model of probe must 990-05-70-03-01 be used with?
It must be used with a 3300 NSv proximity probe and its matching extension cable (such as the 330930 cable).
How to properly power and wire the 990-05-70-03-01?
It is a loop-powered device requiring a +12 to +35 Vdc input at its terminals, where the 2-wire loop simultaneously transmits the 4-20mA signal.
What should be noted when using 990-05-70-03-01 in high humidity environments?
The product features potted construction supporting 100% condensing humidity, but its external electrical terminals are non-submersible.
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