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The 991-06-70-01-CN is a two-wire, loop-powered thrust position transmitter for OEM integration and routine condition monitoring of rotating machinery. Accepting input from a 3300 NSv proximity probe system, it converts a 50-0-50 mils full-scale displacement into an industry-standard 4-20 mA output. This signal connects directly to PLCs, DCSs, or SCADA systems for machinery protection interlocking and over-limit alarming.
Non-isolated PROX OUT and COM terminals plus a coaxial connector provide a dynamic vibration and gap voltage signal output for diagnostics
Non-interacting zero and span potentiometers under the Transmitter label supports loop adjustment
Test Input pin allows quick verification of loop signal output, using a variable DC voltage source as the input
The 991 Thrust 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 axial displacement (thrust) signal as the input to their machinery control system. The transmitter is a 2-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 engineering units proportional to the shaft’s axial position1, and provides it as a 4 to 20 mA industry-standard signal for 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 991-06-70-01-CN Thrust 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.
Thermal Power Plants
Installed on the thrust bearing side of steam turbines and high-power feedwater pumps to continuously monitor axial rotor position displacement, preventing rotor-to-stator contact caused by thrust pad wear.
Petrochemical Refining
Deployed at the rotor ends of high-power centrifugal compressors and high-pressure hydrogenation circulating pumps in cracking units to convert micro-level axial shaft displacement into 4-20mA signals directly sent to DCS systems for safety interlock shutdowns.
Coal Mining and Heavy Hoists
Used on main hoist winch shafts and underground heavy conveyor drive shafts in large mines to capture real-time end thrust variations caused by axial load changes, ensuring mechanical braking safety.
Iron, Steel and Black Metallurgy
Used on the input shafts of large blast furnace blowers, high-pressure dedusting fans, and large multi-axis gearboxes of hot rolling mills to monitor metal fatigue wear of thrust bearings under heavy axial loads.
Modern Papermaking Industry
Installed on the shaft ends of high-speed paper machine drying cylinder vacuum pumps and high-pressure refiner motors to monitor abnormal axial displacement caused by thermal expansion or heavy loads.
Marine Propulsion and Engine Rooms
Serves as the local monitoring node for the axial thrust position of main propulsion shafts and thruster drive shafts on large ocean freighters, complying with global classification society specifications for vibration and thrust monitoring.
When operating the 991-06-70-01-CN, you must strictly ensure that the combined electrical length of the proximity probe and extension cable perfectly matches the transmitter's calibrated 7.0-meter system length, as any mismatch will severely distort the linear range and sensitivity.
During mechanical overhauls and probe installation, use a voltmeter to precisely adjust the initial physical gap until the buffered GAP voltage stabilizes at the voltage value corresponding to the nominal zero-point. The transmitter's metal chassis must be reliably grounded, and the signal loop shield wiring must employ single-point shield grounding to suppress heavy electromagnetic crosstalk.
Finally, when performing maintenance in hazardous explosion-proof areas, never open the enclosure cover or adjust terminal connections while the circuit is energized.
The Bently Nevada 991-06-70-01-CN is a DIN-rail mounted, two-wire loop-powered industrial thrust transmitter. It is dedicated to measuring axial rotor displacement on steam turbines and compressors, featuring a linear range of 0.6-0-0.6 mm while factory-calibrated to match a 7.0-meter 3300 NSv proximity probe system. The hardware converts micro-level displacements directly into a standard 4 to 20 mA analog current output for transmission to PLCs or DCSs, delivering standalone axial protection without an external monitor rack. The -CN suffix denotes compliance with Chinese explosion-proof regulations.
How to correctly use products like the 991-06-70-01-CN?
Install the transmitter inside a field enclosure using a 35mm DIN rail. Connect the input terminal to a 3300 NSv proximity probe via a matching 7.0-meter extension cable. Connect the output terminal to a nominal 24 Vdc two-wire current loop to transmit the 4-20 mA signal directly to an analog input (AI) module of a PLC, DCS, or SCADA system.
Which sensor probe model is compatible with the 991-06-70-01-CN?
The transmitter accepts input signals exclusively from the Bently Nevada 3300 NSv proximity probe and its matching extension cable.
What is the Average Scale Factor (ASF) of the 991-06-70-01-CN?
The nominal average scale factor for the eddy current displacement measurement of this transmitter is 7.87 mV/µm (200 mV/mil).
What electrical precautions are necessary when connecting to the PROX OUT diagnostic interface of the 991-06-70-01-CN?
Because the PROX OUT signal balances on the same internal common ground as the 4-20 mA current loop (non-isolated), a 990/991 Test Adapter is required for electrical isolation when connecting to AC-powered test equipment (such as oscilloscopes). This setup prevents the introduction of ground loop interference and avoids false loop trips.
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