SMART SENSORS

Smart sensors (SS) are referred to the sensors of new generation designed for providing a continuous remote control of dynamic and static parameters of design elements of any devices. SS are determined by IEEE - P1451 standard as sensors which feature the functions beyond the necessary for providing a correct representation, display and transfer of the measured value. These functions include not only measurement, normalization and correction of a signal, but also self-testing, and a digital interface.

The distinctive feature of SS is the digital processing of a signal directly from the sensing device output. This ensures a high accuracy and stability of its characteristics in all admissible measurements ranges and also low interference susceptibility. The field bus enables to transfer simultaneously the results of measurements and the data for diagnostics and monitoring (an instantaneous signal value). The digital signal processing and the possibility of software updating permit to realize various functions of converting controlled values, with further upgrading of characteristics and carried out sensor functions.

The transfer of the measured value occurs via the serial communication channel (RS-485 interface, Modbus-RTU protocol) in the digital code. The signal input in the industrial automatic control system can be conducted via a standard COM-port, or through USB bus of the computer (controller). The maximum haul can achieve 1200 meters and depends on the number of sensors in the network, the type of an applied cable and the communication speed. Availability of options with the output signal 4 … 20 мА and 0 … 5 V allows to use SS as a part of data-collection systems with analog channels or for replacing analog sensors. SS are manufactured both in common industrial version, and in dust-ignition-proof construction.

SS-based systems are enabling:

• a controlled amount of sampling for decreasing random components effect;
• choosing of optimal FFT window for a spectrum analysis;
• to provide independence of metrological characteristics of the measuring channel from external communication lines and data transmitters;
• to exclude the necessity for metrological certification of the measuring channel included into the industrial control system.
• to carry out vibroprotection of the unit for the level of vibration both in the frequency band, and for harmonics of the shaft basic rotation frequency
  (for example, 0.5f; f; 2f; 3f).
• to eliminate the need in ADC at the level of the controller, the galvanic isolation on each channel.
• to transfer a signal directly in physical values (micron, mm/s, m/s2);
• to decrease the number of wirelines.
• to minimize the expenses for installation of communication lines and the lack of booster analog-to-digital converters;
• to shorten the design and development period and to give additional economic benefit to developers of vibromonitoring systems.
  

  RVS -36P

  RVS -94P

  Comparison with contact methods of vibration control