Atmospheric pressure change alarm apparatus

Abstract

Abstract PURPOSE:To achieve the completeness in the prevention of a disaster, by a method wherein the change quantity of the pressure signal from a pressure sensor is detected at every predetermined time by a change quantity detection means and an alarm is generated when the change quantity exceeds a reference value. CONSTITUTION:Atmospheric pressure is detected by a pressure sensor 1 and the pressure signal (a) thereof is directly inputted to a differential amplifier 6 through an amplifier 3 and a signal before a predetermined time (t) is inputted to said amplifier 6 through a sample holding circuit 4 to output the change quantity (b) of the signal at the time (t). The signal (b) thereof is compared with respective reference voltages (c), (c') from reference voltage generating circuits 8, 8' by comparators 7, 7'. When the signal (b) exceeds the signal (c), the alarm lamp of an alarm generator 9 lights and, when the signal (b) exceeds the signal c', alarm sound is generated.

Inventors

• 👤 Noboru Matsunami
• 👤 登 松波
• 👤 Haruhiko Kubota
• 👤 久保田　晴彦

Bibliographic Details