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Electromagnetic flowmeter signal processing function introduction

Electromagnetic flowmeter signal processing function

Digital filtering
The flow signal generally has a certain amount of noise, and the introduction of a suitable time constant damping can smooth the output. Electronic damping is achieved by a single-chip microcomputer. The advantages are simple and reliable, the time constant is arbitrary, and it can be very accurate.

Noise adjustment in vortex flow sensor
In the vortex flow sensor, since there is a certain noise component in the output of the two probes, there is no fluid flow in the pipeline, and the instantaneous flow indicated by the meter is sometimes greater than zero. At this time, the noise balance may be poorly adjusted and adjusted. The above two noises can be balanced to obtain a higher signal to noise ratio.

Make the transmitter have communication capabilities
By transmitting the output signal by means of digital communication, it is possible to obtain higher precision than the analog signal output, because the loss of precision caused by D/A conversion is eliminated.
Another important use of digital communication in transmitters is to facilitate the maintenance and management of the transmitter. This is because the smart meter can realize digital communication with other instruments, DCS, PLC and intelligent communicator (also called handheld terminal) using the same protocol, so that the transmitter can be remotely set and the zero point and range of the transmitter can be modified. The measurement unit and the completion of the diagnosis greatly facilitate the configuration and maintenance of the transmitter. The task that must have been done at the transmitter installation site, or the task that must be removed from the transmitter to the laboratory, can now be done in the control room or wiring cabinet.

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