An active infrared sensor can detect the presence of a human body or an object without contact by using the reflected infrared light emitted from the emitting section. There are two types of active infrared sensors, distance sensors and proximity sensors. They have the following features.

The distance sensor uses the principle of triangulation, and detects the human body by calculating the distance to the target from the angle of light entering the light receiving area.
It is not easily affected by the color or reflectance of the sensing object, detects the presence or absence of the sensing object, and performs signal processing with the built-in microcomputer. It can distinguish between a slightly moving human body and a completely stationary object. It is an epoch-making sensor.
For example, it is possible to distinguish between a human body sitting on a desk and the back of a chair, or between a human body sitting on a toilet and a toilet seat cover. It contributes to the energy saving of various devices such as personal computers, desk lights, and toilet seats.

Proximity sensors detect changes in the amount of light entering the light receiving section.
It has a wider field of view than distance measuring sensors, and its structure is simple, so it can be configured at low cost.
It can be used as a switch for lighting and ventilation fans in toilets, conference rooms, and kitchens.
It can be used hygienically by turning ON/OFF the switch without contact.

Part number
Exterior dimension(mm)
Detection distance(cm)
Power-supply voltage
image Distance sensor SN5-0180 70×31.4×35.5 50~200 DC5V
image Distance sensor SN5-0185 70×20×32 50~200 DC5V
image Distance sensor +Motion Detector SN1-0190 67×62×42 50~200 AC100V
image Distance sensor SN5-0186 44.5×19×13.5 18 DC5V
image Distance sensor SN5-0187 44.5×19×13.5 80 DC5V
image Proximity sensor SN1-0660 199.5×51.8×17.5 90~230 AC100V