Uploaded September 2013 | Updated September 2026, 2 weeks ago
Tishitu explains
Passive infrared (PIR) PIR sensors, the most commonly used type, are able to "see" heat emitted by occupants. Triggering occurs when a change in infrared levels is detected, as when a warm object moves in or out of view of one of the sensor's "eyes." PIR sensors are quite resistant to false triggering. They are best used within a 15-foot range for two reasons: first, there are potential "dead" spots between their wedge-shaped sensory patterns that get wider with distance (Figure 1); and, second, being passive, they do not send out any signal. Instead, PIR sensors depend on the intensity of the heat output of the moving part of the subject.
General Information
Occupancy sensors detect the presence or absence of people and turn lights on and off accordingly. They may reduce lighting energy consumption by 50 percent or more in some circumstances, but the savings for any given installed sensor can be much less. As a result, it's important to carefully consider a wide variety of issues before installing an occupancy sensor in any specific location.
They are used most effectively in spaces that are often unoccupied, including some offices, warehouses, storerooms, restrooms, loading docks, corridors, stairwells, office lounges, and conference rooms. Open-plan office spaces, where one or more people may be moving in and out throughout the course of the workday, are not good candidates for occupancy sensors.
Type of room
Energy savings (%)
Private office
15 to 52
Open-plan office
22 to 30
Classroom
41 to 48
Conference room
20 to 70
Restroom
30 to 90
Corridors
40 to 85
Storage area/closet
45 to 80
To determine more precisely how effective occupancy sensors are likely to be, monitor patterns of lighting use and occupancy simultaneously. Several tools are available to do this:
• Lighting loggers. These count lighting hours, record the time-of-use or duration, and may even correlate duration with sensed occupancy. Recording ammeters may be connected at lighting breaker panels to determine when banks of rooms on a common electric feeder are using their lights. Savings can be determined by comparing the ammeter's data to work and cleaning schedules.
• Random surveys. Observing a building at night may reveal rooms where lights have been inadvertently left on, as may routine questioning of custodial and security personnel.
Evaluate cost-effectiveness Reducing energy consumption does not necessarily equal reduction in cost. A promotional video from one sensor manufacturer states that the installation of occupancy sensors on a 10-kilowatt lighting circuit in a major Gurgaon City building reduced lighting energy consumption by 56 percent. However, because the reduction in peak lighting demand was only 20 percent, the total savings—taking into account the cost of power at the time of savings and the actual demand charges involved—-were about 38 percent
Ultrasonic Motion Sensor Light & PIR Motion Sensor For Toilet Bathrooms WC Restrooms
Ceiling mount PIR motion sensor and wall mount ultrasonic motion sensor light for toilets, bathrooms, WC, washrooms and restroom. Professional sensor in innovative high-frequency design for perfect surveillance of indoor areas The HF 3360 is a motion detector that works on the basis of cutting-edge HF sensor technology. It emits a 5.8 GHz signal and responds to changes in the echo pattern caused by even smallest movement of persons or objects (e.g. at a distance of 3 m). The HF 3360 responds more or less instantly to any movement in the detection zone, regardless of temperature and walking direction. This makes it the ideal choice for use in stairwells or other indoor spaces. Bristling with electronics, it is designed for professional use. It has a switching capacity of 150 watts. Sensors connected in parallel are identified automatically. At a reach of up to 8 m, it has a 360° detection zone with an aperture angle of no less than 140°. This makes it possible to watch over large indoor spaces reliably and without the need for major installation work. High-frequency wall and ceiling sensor for the perfect surveillance of indoor spaces, detection independent of temperature Reach 1 -- 8m Coverage angle: 360°, angle of aperture: 140°
TISHITU
ISO: 9001-2008
RESEARCH AND CONSULTANCY CELL OF INDUSTRIAL APPLICATION
A Joint Accreditation System of Australia and New Zealand
Copyright © All Rights Reserved tishitu.org Reg No.08122629691/SSI
Accreditation No. M3111204IN
-~-~~-~~~-~~-~-
Please watch: "Lifi Communication by Arduino UNO Download Project"
youtube.com/watch?v=c4gC8dbaiZg
-~-~~-~~~-~~-~-
Tishitu explains
Passive infrared (PIR) PIR sensors, the most commonly used type, are able to "see" heat emitted by occupants. Triggering occurs when a change in infrared levels is detected, as when a warm object moves in or out of view of one of the sensor's "eyes." PIR sensors are quite resistant to false triggering. They are best used within a 15-foot range for two reasons: first, there are potential "dead" spots between their wedge-shaped sensory patterns that get wider with distance (Figure 1); and, second, being passive, they do not send out any signal. Instead, PIR sensors depend on the intensity of the heat output of the moving part of the subject.
General Information
Occupancy sensors detect the presence or absence of people and turn lights on and off accordingly. They may reduce lighting energy consumption by 50 percent or more in some circumstances, but the savings for any given installed sensor can be much less. As a result, it's important to carefully consider a wide variety of issues before installing an occupancy sensor in any specific location.
They are used most effectively in spaces that are often unoccupied, including some offices, warehouses, storerooms, restrooms, loading docks, corridors, stairwells, office lounges, and conference rooms. Open-plan office spaces, where one or more people may be moving in and out throughout the course of the workday, are not good candidates for occupancy sensors.
Type of room
Energy savings (%)
Private office
15 to 52
Open-plan office
22 to 30
Classroom
41 to 48
Conference room
20 to 70
Restroom
30 to 90
Corridors
40 to 85
Storage area/closet
45 to 80
To determine more precisely how effective occupancy sensors are likely to be, monitor patterns of lighting use and occupancy simultaneously. Several tools are available to do this:
• Lighting loggers. These count lighting hours, record the time-of-use or duration, and may even correlate duration with sensed occupancy. Recording ammeters may be connected at lighting breaker panels to determine when banks of rooms on a common electric feeder are using their lights. Savings can be determined by comparing the ammeter's data to work and cleaning schedules.
• Random surveys. Observing a building at night may reveal rooms where lights have been inadvertently left on, as may routine questioning of custodial and security personnel.
Evaluate cost-effectiveness Reducing energy consumption does not necessarily equal reduction in cost. A promotional video from one sensor manufacturer states that the installation of occupancy sensors on a 10-kilowatt lighting circuit in a major Gurgaon City building reduced lighting energy consumption by 56 percent. However, because the reduction in peak lighting demand was only 20 percent, the total savings—taking into account the cost of power at the time of savings and the actual demand charges involved—-were about 38 percent
Ultrasonic Motion Sensor Light & PIR Motion Sensor For Toilet Bathrooms WC Restrooms
Ceiling mount PIR motion sensor and wall mount ultrasonic motion sensor light for toilets, bathrooms, WC, washrooms and restroom. Professional sensor in innovative high-frequency design for perfect surveillance of indoor areas The HF 3360 is a motion detector that works on the basis of cutting-edge HF sensor technology. It emits a 5.8 GHz signal and responds to changes in the echo pattern caused by even smallest movement of persons or objects (e.g. at a distance of 3 m). The HF 3360 responds more or less instantly to any movement in the detection zone, regardless of temperature and walking direction. This makes it the ideal choice for use in stairwells or other indoor spaces. Bristling with electronics, it is designed for professional use. It has a switching capacity of 150 watts. Sensors connected in parallel are identified automatically. At a reach of up to 8 m, it has a 360° detection zone with an aperture angle of no less than 140°. This makes it possible to watch over large indoor spaces reliably and without the need for major installation work. High-frequency wall and ceiling sensor for the perfect surveillance of indoor spaces, detection independent of temperature Reach 1 -- 8m Coverage angle: 360°, angle of aperture: 140°
TISHITU
ISO: 9001-2008
RESEARCH AND CONSULTANCY CELL OF INDUSTRIAL APPLICATION
A Joint Accreditation System of Australia and New Zealand
Copyright © All Rights Reserved tishitu.org Reg No.08122629691/SSI
Accreditation No. M3111204IN
-~-~~-~~~-~~-~-
Please watch: "Lifi Communication by Arduino UNO Download Project"
youtube.com/watch?v=c4gC8dbaiZg
-~-~~-~~~-~~-~-
