Sensor control device, sensor system, and load control system

A sensor control device which controls:

• a first sensor which detects, based on a captured image, whether a person is present in a first detection range;
• and a second sensor which detects, based on infrared radiation, whether a person is present in a second detection range which overlaps at least a portion of the first detection range, the sensor control device comprising:
• a determiner which has a first determination mode for determining whether a person is present, based on a result of detection by the first sensor and a result of detection by the second sensor, and a second determination mode for determining whether a person is present, based on a result of detection by the second sensor, wherein
• the determiner suspends determination as to whether a person is present in the first determination mode, if a brightness change value indicating a change in brightness in the first detection range during a certain time period is greater than a predetermined value in the first determination mode, and determines whether a person is present in the first determination mode, if the brightness change value in the first detection range is less than the predetermined value in the first determination mode.