A corridor entrance, a stair landing and an office desk ask a PIR sensor to do different jobs. PIR detection depends on changes in infrared energy as a warm body moves through the sensing field. A person crossing the field may be easier to detect than one walking straight toward the lens. Draw the routes people actually take and mark doors, corners, daylight and the position of each light before choosing a unit.
Understanding how PIR detects motion helps when deciding where to place and test the sensor along the intended route.
IRIS S20 is a ceiling-mounted PIR option with a 360-degree field, a stated maximum 10 m radius, a 10-second to 30-minute delay and a 300 W LED load rating. Its longer maximum delay can help where the desired lighting period is longer, but it does not turn PIR into still-person detection.
IRIS S8 is a compact wall- or ceiling-mount option for indoor circulation areas. Its technical specification states an 8 m maximum detection distance and 200 W LED load at 220-240 V AC. IRIS S12 is a surface-mounted ceiling option with 360-degree detection, a stated 12 m maximum distance and a 300 W LED load rating. The actual usable zone depends on mounting and walk tests – not just the maximum figure.
| Model | Mounting / coverage | LED load | Selection cue |
|---|---|---|---|
| IRIS S20 | Ceiling; 360 degrees; up to 10 m radius | 300 W | Longer maximum time delay – up to 30 minutes |
| IRIS S8 | Wall or ceiling; up to 8 m stated distance | 200 W at 220-240 V AC | Compact indoor circulation zones |
| IRIS S12 | Surface ceiling; 360 degrees; up to 12 m stated distance | 300 W | Indoor ceiling layout with shorter stated reach than S20 |
These are model-specific ratings, not promises of coverage at every site. Check the current datasheet, supply voltage and connected LED driver before installation. Adjust the delay on the installed unit according to its instructions.
Include the nearest doorway, stair landing, side corridor and any adjacent area whose traffic should not switch the light. Note whether a person crosses or approaches the sensor field directly.
Follow the installed model’s test instructions: use its short test delay and daylight test setting, allow any specified warm-up and walk each route. A bright room can hide an otherwise working sensor if the lux threshold is set to inhibit the light.
After the routes work, choose the hold time and ambient-light threshold for real occupancy. Test again in daylight and after dark. A longer delay can reduce unwanted shutoffs during quiet periods but also keeps the light on after people leave. For sustained seated occupancy, consider the true presence range instead of promising PIR will sense someone who is still.
Record the model, mounting position, lighting load, approach routes, tested daylight conditions and final control settings. Ask a qualified electrician to check wiring and load compatibility; do not treat a walk test as an electrical safety check.
Compare the Sensinova PIR range or share your floor plan with the team for a model-specific recommendation.
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