Bently Nevada 330752-60

1. Specification

Frequency response:

Low frequency：Generally runs down to 2Hz, it can monitor low-frequency vibration signals such as startup and shutdown in operating rotating machines, which is greatly significant in analyzing the overall operating condition and low-frequency fault characteristics of the equipment.

High frequency: It can extent up to 10kHz and catch high-frequency vibrations generated by high-speed heavy equipment to monitor gear meshing and bearing conditions and promptly discover local faults.

Measurement range: Shaft vibration: 0-500u, P-P is capable of satisfying conventional needs for most shaft vibration monitoring on rotating machinery and effectively to check small vibration variations for shaft during running operation equipment.

Displacement: 2.5 to 5 mm the monitoring range from normal running operating to large movement change in rotating machinery, helping in timely discovering shaft movement-like problem.

Power supply voltage: +12V DC--+30V DC. Operating temperature: -40C--+85C.

2. Feature

Real-time monitoring and fast data transmission: Bently Nevada 330752-60 supports online monitor functions and can transmit the measured data to the online monitor system or to the data computer. It can use wired networks, or wireless ones, among alternative data transmission modes, ensuring timeliness and effective use of information so that the operator is informed of equipment operation at any time for a timely response and decision making.

Advanced fault diagnosis and early warning function: With built-in advanced fault diagnosis algorithms and models, Bently Nevada 330752-60 quickly analyzes and processes real-time monitor data, effectively automatically identifying abnormal conditions of equipment operations and issuing timely early warning signals. When measured parameters overcome certain pre-set levels or report abnormal shifts in trends, the system will promptly give hearing and visual alarms to alert the technically trained personnel to take appropriate precautionary action to stem further advances in equipment failures which lowers maintenance costs-to-requesting and equipment downtime.  

3. Application

Cement industry:

The ball mill in the cement product is an important piece of large rotating machinery, whose operating condition directly affects the quality of cement produced and the efficiency of its manufacture. Shaft vibration and displacement monitoring for ball mills have begun to use the Bently Nevada 330752-60. During operation of a ball mill in a cement plant, the ball mill recorded periodic abnormal fluctuations in shaft vibration. Upon examination of such abnormal shaft vibration, it was found that the uneven wear of the liner of the ball mill caused the uneven distribution of materials in the mill. This caused the abnormal vibration. The data obtained from condition monitoring indicates that the cement plant timely replaced the liner, adjusted the filling ratio of materials, thus successfully reestablishing normal operation of the ball mill, thus reducing the failure rate of equipment, and thereby enhancing cement output and quality.

Papermaking industries:

The dryer cylinder used in a paper machine is another typical rotating unit whose running stability will reasonably affect paper quality. The Bently Nevada 330752-60 monitors the shaft vibration and displacement of the drying cylinders. Thus, during production in a paper mill, the Bently 330752-60 detected a shaft-vibration anomaly in the dryer cylinder. Upon examination, we discovered that the failure of the dried cylinder's bearing lubrication resulted in excess friction and thereby increased the level of shaft vibration. Timely lubrication maintenance was given top priority, and this solved the shaft vibration problem. All this directly ensured production quality for the paper mill while lowering losses from defects due to paper quality.

The steel sector:

Within the rolling production lines in the steelworks, it is necessary to closely monitor rotating components like the work and support rolls of the mills. The Bently Nevada 330752-60 was mounted upon the rolling mill's bearing seat to effect real-time monitoring of shaft vibration on the working roll of the rolling mill itself, as for instance, in a hot rolling mill in a steelworks. During the rolling process, while Bently 330752-60 was active, a sudden rise with the shaft vibration of the working roll overstepped the pre-set alarm value. Hasty action was needed, so technicians discontinued machine operation to do inspections. They found high-impact loading from steel pile-up on the working rolls during rolling. Combine that along with quick response to steel pile-up and with inspection, and repairs optimized the line's normal operation for rolling steel, hence improving the quality of products produced and production reliability.