Patent ID: 11893871
Assignee: HONEYWELL INTERNATIONAL INC.
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A gas detector comprising:
a housing;
control circuits carried within the housing;
a plurality of sensors coupled to the control circuits and carried within the housing, wherein each of the plurality of sensors is configured to sense a different ambient condition according to a different sensing technology;
a compliance indicator, carried by the housing and coupled to the control circuits, the compliance indicator configured to emit a visual alarm having a first emitted color at a predetermined frequency; and
an alarm condition indicator, carried by the housing and coupled to the control circuits, the alarm condition indicator configured to emit an aural alarm or another visual alarm having a second emitted color in response to an alarm condition,
wherein the control circuits are configured, while at least one sensor of the plurality of sensors simultaneously senses according to a respective sensing technology, to:
determine whether a previous calibration attempt had been successful for each of the plurality of sensors,
establish a first pre-set time interval until the next calibration attempt is to be made for each of the plurality of sensors when the previous calibration attempt was successful for each of the plurality of sensors,
determine whether a previous bump test had been successful for each of the plurality of sensors,
establish a second pre-set time interval until the next bump test is to be made for each of the plurality of sensors when the previous bump test was successful for each of the plurality of sensors,
determine if the at least one sensor of the plurality of sensors senses an unsafe ambient condition,
in an instance in which the previous calibration attempt had been successful for each of the plurality of sensors, the first pre-set time interval has not expired for each of the plurality of sensors, the previous bump test had been successful for each of the plurality of sensors, and the second pre-set time interval has not expired for each of the plurality of sensors, activate the compliance indicator to indicate that each of the plurality of sensors of the gas detector is in compliance with pre-established calibration requirements and with pre-established bump test requirements, and
in an instance in which the at least one sensor of the plurality of sensors senses an unsafe ambient condition, the calibration test attempt fails for any one of the plurality of sensors, the bump test attempt fails for any one of the plurality of sensors, the first predetermined time interval has lapsed without a new calibration attempt for any one of the plurality of sensors, or the second predetermined time interval has lapsed without a new bump test attempt for any one of the plurality of sensors, activate the alarm condition indicator and either not activate the compliance indicator or deactivate the compliance indicator.