OCCUPANCY SENSOR WITH ACTIVE SENSITIVITY ADJUSTMENT BASED ON AMBIENT TEMPERATURE
First Claim
1. An occupancy sensor, comprising:
- a passive infrared (PIR) sensing element to sense an occupant in a monitored space;
a temperature sensing element to sense an ambient temperature of the monitored space; and
a processor communicatively coupled to the PIR sensing element and the temperature sensing element;
the processor being programmed to;
adjust an occupant sensing threshold based on information representative of the ambient temperature in the monitored space.
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Abstract
A system and method provide fail-safe operation of a lighting system. A lighting level detector is used to obtain a baseline lighting level for a low-intensity light. If the detector measures less than the baseline level when an occupancy sensor determines the space is unoccupied, a high-intensity light is energized and an indication is provided to a user that the low-intensity light has failed. A method provides daylighting operation of a lighting system. An occupancy sensor can have Wi-Fi functionality to enable remote configuration of the sensor. A line voltage occupancy sensor can include an interface with low voltage devices. An occupancy sensor can include an integral interface to enable an external control system to override the sensor'"'"'s normal logic under emergency conditions. An occupancy sensor can include an active temperature compensation feature. An occupancy sensor can also incorporate an automatically adjustable coverage area.
9 Citations
21 Claims
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1. An occupancy sensor, comprising:
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a passive infrared (PIR) sensing element to sense an occupant in a monitored space; a temperature sensing element to sense an ambient temperature of the monitored space; and a processor communicatively coupled to the PIR sensing element and the temperature sensing element;
the processor being programmed to;adjust an occupant sensing threshold based on information representative of the ambient temperature in the monitored space. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 11, 12)
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9. The occupancy sensor of 1, wherein the processor includes an algorithm to adjust the occupant sensing threshold.
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10. The occupancy sensor of 1, wherein the occupancy sensor further comprises memory for storing a lookup table, the processor utilizing the lookup table to adjust the occupant sensing threshold.
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13. An occupancy sensor comprising:
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a sensing element to sense an occupant in a monitored space and to sense an ambient temperature of the monitored space; and a processor communicatively coupled to the sensing element, the processor being programmed to actively adjust an occupant sensing threshold to account for changes in ambient temperatures in the monitored space. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A method for energizing a load;
- the method comprising the steps of;
sensing a background infrared level of a monitored space; sensing an ambient temperature of the monitored space; periodically sensing a heat signature of the monitored space; determining whether the heat signature exceeds the background infrared level by an occupant sensing threshold; transmitting, when the occupant sensing threshold has been met or exceeded, an occupied signal to a load control device, the occupied signal instructing the load control device to energize the load; and actively adjusting the occupant sensing threshold based on changes in the sensed ambient temperature of the monitored space. - View Dependent Claims (20, 21)
- the method comprising the steps of;
Specification