| 摘要 |
A gas monitoring system for use with a gas-fired boiler in a house or the like. The boiler is supplied with flammable gas. The system comprises a transducer, a visible and audible alarm circuit, a digital access terminal, an exhaust fan, and alarm systems, which may be audible or visual. Leaked gas is detected by a gas transducer which produces a voltage indicative of the presence of gas. An electronic circuit, which comprises a comparator, buffer, and power transistor, receives the voltages from the transducer and, when a predetermined level of voltage is received, turns on and closes two switches. One switch enables an audio alarm and provides power to a second switch. The second switch, when closed, joins a source of power to a visual alarm (a bulb), turns on an exhaust fan, and closes a normally open solenoid valve. The solenoid valve is in the gas-conveying conduit. Closing the valve shuts off the unwanted flow of gas. The first switch is provided with a manual reset switch for resetting the system.
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