K15/K24 Occupancy Sensors
For public areas, designing an energy saving switch should meet these factors:
Manual Lights On
Should be convenient for the user to turn the lights on as needed, and not have it turned on automatically when not needed.
Wear & Tear from Frequent Operation
Should avoid cycling the lights too frequently which inflicts wears down both the luminaire and the relays controlling it. Resulting in more frequent maintenance and net loss.
IR sensors are used as the most common form of energy saving, but they suffer from several shortcomings:
Wear & Tear from Frequent On/Off
- Using sensors results in much too frequent operation of the lights, and results in greater wear and tear on the both the luminaires and shortens their lifespan. This is especially true for highly trafficked areas such as corridors, restrooms and elevator lobbies.
- For LED and compact fluorescent lamps especially; their large inrush currents harms the relays used and makes them fail much sooner.
These two types of smart energy saving switches are simple yet practical, they meet the need for manual on and auto off control, totalling avoiding he problem of forgetting to turn the lights off when leaving.
A unique feature of these devices is that they combine wall switches with the sensors into one solution.
The K15 is a ceiling mounted sensor for use in large spaces and which could also be integrated into our lighting control system.
- Lux sensitivity adjustment
- Adjustable delay off time
- Dry contact output
- Selectable occupancy or vacancy mode
- AC powered, no separate power supply needed.
(1) Vacancy Mode
Vacancy Mode: Typically used in places where people stay for long; e.g. reception lobby, office, work area, classrooms, libraries, labs, etc.
- Room Occupied: The occupant can control the lights manually anytime.
- Occupant Leaves: If the occupant forgets to turn off the lights, the sensors will automatically do it in their stead.
- When the occupant is just resting or watching a projection, they will want to dim the room and manually turn off the lights.
(2) Occupancy Mode
Occupancy Mode: Commonly used for trafficked areas where people don't stay for long; e.g. restrooms, elevator lobbies, hallways, kitchenettes
- When the brightness is sufficient, the sensor will detect the occupants presence but will not turn on the lights.
- When the brightness is insufficient, the sensor will turn the lights on when there is an occupant and turn it off once the occupant leaves.
(3) Auto Mode
Typically Used In: storerooms, data centers
Method of Operation: auto on, auto off
Note: The occupant may stay for either a short or long time, these two situations require two different delay periods. The K24 has the capability to sense these two different situations and automatically determine the right delay time to use.
(4) Steady Mode
Steady Mode: Under occupancy mode, when there is a need for the occupant to stay for long, they can do a long press to force the lights to go into steady mode and ignore the sensor (applies only to the K15).
- In a storeroom or data center, most of the time the occupant only stays for a short time, but there are times when there is a need to stay for a long time and wouldn't want the sensor to turn off the lights at an inopportune time.
- During these situations, the occupant can do a long button press to force the lights to go to steady mode and remain on.
- The K24 is wall mounted. It combines the sensor and switch into one enclosure. The lux sensor threshold can be adjusted.
Two types of power source:
- The L/G type requires the live wire and any grounding; it is suited for existing installation retrofits.
- The L/N type requires the live wire and the neutral wire; it is best used for new installations.
- Power supply can make use of either 120, 220 or 277V.
- The K15 is a ceiling mounted sensor, it is equipped with an adjustable sensitivity lux sensor, and can be connected to a button switch.
- Output: Supports both ac output for connecting with the lights and also a dry contact output.
- Wide voltage range, can be used with 120/220/277V.