Title:
CIRCUIT FOR MEASURING ABRUPT PRESSURE VARIATION
Document Type and Number:
Japanese Patent JPS6345523
Kind Code:
A
Abstract:
PURPOSE:To know abrupt variation in pressure by a simple circuit without being affected by a nose by outputting a signal which indicates abnormality when the pressure varies from lower-limit pressure to upper-limit pressure within a constant time. CONSTITUTION:When the pressure in piping rises above the lower-limit pressure, the pressure switch 10a of a lower-limit pressure detection part 10 operates to output a high-level lower-limit detection signal alpha. This signal alpha is inputted to a decision circuit 13 and also inputted to a variation time measuring circuit 12, which outputs a variation time elapse signal delta falling a certain time after the input of the signal alpha to a decision circuit 13. When the pressure in the piping further rises above the lower-limit pressure, the pressure switch 11a of an upper-limit pressure detection part 11 operates to output a high-level upper-limit detection detection signal beta to the decision circuit 13. Consequently, when the pressure in the piping varies from the lower-limit pressure to the upper-limit pressure within the constant time, the decision circuit 13 outputs an abnormality signal epsilon.
Inventors:
SENDA NOBUHISA
Application Number:
JP18994686A
Publication Date:
February 26, 1988
Filing Date:
August 13, 1986
Export Citation:
Assignee:
YOKOGAWA ELECTRIC CORP
International Classes:
G01L9/00; H03K17/94; (IPC1-7): G01L9/00; H03K17/94
Attorney, Agent or Firm:
Shinsuke Ozawa
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