초록 ▼

A cabin pressure altitude monitor and warning system provides a warning when a detected cabin pressure altitude has reached a predetermined level. The system is preferably embodied in a portable, pager-sized device that can be carried or worn by an individual. A microprocessor calculates the pressur

A cabin pressure altitude monitor and warning system provides a warning when a detected cabin pressure altitude has reached a predetermined level. The system is preferably embodied in a portable, pager-sized device that can be carried or worn by an individual. A microprocessor calculates the pressure altitude from signals generated by a calibrated pressure transducer and a temperature sensor that compensates for temperature variations in the signals generated by the pressure transducer. The microprocessor is programmed to generate a warning or alarm if a cabin pressure altitude exceeding a predetermined threshold is detected. Preferably, the microprocessor generates two different types of warning or alarm outputs, a first early warning or alert when a first pressure altitude is exceeded, and a second more serious alarm condition when either a second, higher pressure altitude is exceeded, or when the first pressure altitude has been exceeded for a predetermined period of time. Multiple types of alarm condition indicators are preferably provided, including visual, audible and tactile. The system is also preferably designed to detect gas concentrations and other ambient conditions, and thus incorporates other sensors, such as oxygen, relative humidity, carbon dioxide, carbon monoxide and ammonia sensors, to provide a more complete characterization and monitoring of the local environment.

대표청구항 ▼

1. A method of monitoring and alerting a user to an ambient condition based on equivalent pressure altitude level comprising:selecting a first predetermined equivalent pressure altitude level; selecting a first predetermined period of time; measuring the equivalent pressure altitude level; comparing

1. A method of monitoring and alerting a user to an ambient condition based on equivalent pressure altitude level comprising:selecting a first predetermined equivalent pressure altitude level; selecting a first predetermined period of time; measuring the equivalent pressure altitude level; comparing the first predetermined equivalent pressure altitude level with the measured equivalent pressure altitude level; measuring a period of time when the measured equivalent pressure altitude level is greater than the first predetermined equivalent pressure altitude level; and alerting the user with a time period signal when the measured period of time is greater than the predetermined period of time.