Electromagnetic flowmeter
AssigneeTokyo Shibaura Denki Kabushiki Kaisha
InventorToyofumi Tomita
Life of this patent
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Abstract
An electromagnetic flowmeter includes a flow rate detecting circuit; an exciting circuit for supplying an exciting current to this flow rate detecting circuit; a signal processing section for sampling an output signal from the flow rate detecting circuit and smoothing this sampled output signal; and a signal generating circuit for supplying a sampling signal and an excitation control signal to the exciting circuit and the signal processing section, respectively. This signal generating circuit supplies a sampling signal having the frequency which is apart by a range of 0.5 to 10% from the frequency of the commercial power source to the signal processing section.
Claims7
An electromagnetic flowmeter comprising:
- flow rate detecting means for detecting the flow rate of a conductive fluid;
- exciting means for supplying an exciting current to said flow rate detecting means in response to an excitation control signal;
- signal processing means for sampling an output signal from said flow rate detecting means in response to a sampling signal and for smoothing this sampled signal;
- and
- signal generating means for supplying a sampling signal to said signal processing means and an excitation control signal to said exciting means, said sampling signal having a frequency different from the commercial power frequency by 0.5 to 10%, said excitation control signal having a frequency which is an even fraction of the frequency of said sampling signal.
Dependencies are inferred from the claim text.