Quick Answer:

A presence sensor keeps lights on for a stationary occupant — a seated person at a desk, a student in a lecture, a patient in a hospital bed — whereas a standard motion sensor switches lights off after a short period of no gross movement. The Esysense Human Presence Sensor (high-sensitivity PIR/radar, ceiling mount) is for offices, classrooms, and libraries where people remain still for extended periods. The Esysense PIR Presence Sensor with Remote adds wireless configuration from floor level — essential for commercial ceiling installations where ladder access is inconvenient.

Human Presence Sensor

• Detection: High-sensitivity PIR/Radar

• Mounting: Ceiling

• Remote Control: No

• Best For: Offices, Classrooms, Libraries & Hospital wards

• Product Link:esysense.com/products/human-presence-sensor

PIR Presence Sensor with Remote

• Detection: High-sensitivity PIR

• Mounting: Ceiling or Wall

• Remote Control: Yes (IR/RF Remote)

• Best For: Commercial offices, Large meeting rooms & Conference spaces

• Product Link: esysense.com/collections/smart-sensors

Presence sensors: esysense.com/collections/smart-sensors

Presence Sensor vs Motion Sensor — Key Differences

Presence Sensor

• Detects Walking / Large Movements: Yes

• Detects Seated or Stationary Occupants: Yes

• Suitable For Offices & Study Rooms: Excellent

• Suitable For Corridors & Bathrooms: Yes

• Detection Technology: High-sensitivity PIR or Radar

• False-Off Risk: Very Low

• Best For: Offices, Classrooms, Libraries, Hospitals, Meeting rooms & Study areas

Standard Motion Sensor

• Detects Walking / Large Movements: Yes

• Detects Seated or Stationary Occupants: No

• Suitable For Offices & Study Rooms: Can be disruptive

• Suitable For Corridors & Bathrooms: Yes

• Detection Technology: Standard PIR or Radar

• False-Off Risk: Moderate to High

• Best For: Corridors, Bathrooms, Storerooms, Staircases & Pass-through areas

Installation Guide

1. Select ceiling mounting position — room center for 360-degree coverage (presence detection is directional: ceiling mounting is strongly preferred over wall mounting for room occupancy).

2. Route 220V AC mains supply wiring to the ceiling mounting point.

3. Wire in series: Mains Live →Sensor L-in → Sensor L-out → Light Live. Neutral and Earth direct to light (bypass sensor).

4. Mount sensor housing to ceiling. Restore power. Allow 30-60 second startup calibration period.

5. Walk into the detection zone — verify activation. Then sit quietly at a desk within range for 3-5 minutes — verify the light remains on. This confirms presence (not just motion) detection is functioning correctly.

6. Leave the room and wait for the preset delay — verify lights switch off. Adjust delay via remote or potentiometer if needed.

Frequently Asked Questions

Q: Is a presence sensor suitable for a bathroom?

A: Yes — a presence sensor in a bathroom ensures lights stay on throughout the user's time inside (including during a shower when movement is limited). Choose IP44 rating minimum. Set a 5-10 minute delay to allow steam clearing after vacancy.

Q: What is the detection range of an Esysense presence sensor?

A: Esysense presence sensors typically provide reliable presence detection within a 3-10 meter radius from the sensor. Exact range is available on the product page at esysense.com/products/human-presence-sensor.

People Also Ask

Q: What is a human presence sensor and how is it different from a motion sensor?

A: A human presence sensor detects whether a person is in a space — including when sitting still — using high-sensitivity PIR or radar to detect micro-movements and breathing. A standard motion sensor detects only gross body movement and switches off when a seated person is too still to trigger it.

Q: Why does my office motion sensor keep switching off while I'm at my desk?

A: A standard motion sensor requires visible body movement above its sensitivity threshold to stay triggered. Seated desk work generates insufficient movement. Replace with a presence sensor — it detects the subtle micro-movements of a working person and keeps lights on throughout the session.

Conclusion

Presence sensors solve the one problem standard motion sensors cannot — keeping lights on for stationary occupants. For offices, classrooms, libraries, and home study rooms, a presence sensor is not a premium upgrade, it is the correct product for the application. The Esysense Human Presence Sensor and PIR Presence Sensor with Remote are available at esysense.com/collections/smart-sensors

Written from direct product testing and manufacturer specifications by Esysense Tech Innovations Pvt. Ltd., Ghaziabad, India. All prices, specs and model references are verified against live product listings at esysense.com. Last updated: June 2026