Presence in open-plan offices is detected with a PD-2200 IR detector with 51 lens. The lenses are masked and the detectors are aimed so that only the chosen area is watched. Lenses are masked using a special tape. The sensitivity of the detector can also be turned down, which has the effect of reducing the detection area.

1A. Open-plan office with daylight illumination.

In this case the lighting must be switched on manually with a pushbutton in the usual way when required. This allows the hidden savings potential to be exploited, since lighting is only switched on when additional light is required. When no one is present the lighting is switched off automatically. This function is achieved using the EX-11 logic module. The light fittings in the area are divided into two groups that are controlled individually by separate IR detectors via one EX-11. This means that if people are only present in one half of the area, only this half is illuminated. For wiring, see application 3A.

1B. Open-plan office with little or no daylight illumination.

In this area, which has little or no natural light, the lighting is switched on automatically when presence is detected. However there is also the option to switch on or off each light fitting manually using a pull switch. When no one is present the lighting is switched off automatically. In an open-plan office or parts of an open-plan office, where detection by IR detector is poor, for example due to partitions, shelves or other furniture that masks the detector, an AD-350 auxiliary acoustic detector can be used. This detects high-frequency sound (such as footsteps, rustling paper or speech) and ensures that the lighting remains on. AD-350 is activated when the IR detector has detected presence. AD-350 can be wired so that it only controls a single lighting group. For wiring, see applications 2A and 10A (AD-350).

2A & B. Small, narrow open-plan offices. Detection is by means of a downward-looking ceiling-mounted PD-2200 with 51 lens.

The size of the detection area depends on the ceiling height (installation height). In these premises we have calculated an installation height of 2.7 m. This gives a detection area around 3.1 x 7.2 m in size with 51 lens. See application 6C for information on how big the detection area will be with PD-2200 and 51 lens for different installation heights.

Take care when using ceiling detectors, their sensitivity varies widely from manufacturer to manufacturer! See “Performance comparison” under “Other information” in the “Planning Guide”.

2A. Narrow open-plan office with daylight illumination.

Lighting is switched on manually with a pushbutton in the usual way when required. This allows the hidden savings potential to be exploited, since lighting is only switched on when additional light is required. When no one is present the lighting is switched off automatically. This function is achieved using the EX-11 logic module. The light fittings in the area are divided into two groups that are controlled individually by separate IR detectors via one EX-11. This means that if people are only present in one half of the area, only this half is illuminated. For wiring, see application 3A.

2B. Narrow open-plan office with little or no daylight illumination.

Same function as area 1B described above. For wiring, see application 2A

3. Aisles that are open at the sides. Note that detection only covers movement in the aisle. Detection is by means of a PD-2200 IR detector with 17 lens, which is installed flat against the ceiling at 45 degrees to the vertical. See application 2F which shows how the detector should be installed.

One detector is capable of watching aisles that are up to 50 m long. In aisles that are up to 100 m long, two detectors are used, one at each end facing each other. In aisles that are over 100 m long, additional detectors must be installed.

The aisles in this example are used very frequently during certain periods, so a dynamic lighting control installation should be chosen. This entails the use of dimmable HF ballasts, presence detectors and level selectors.

“Dynamic lighting control” works as follows: When people are present the lighting is set to around 80 per cent. When no presence is detected for 15 – 60 seconds, the lighting level is reduced to around 2 per cent. When someone enters the corridor the level is immediately increased to 80 per cent. When no one has been present for 1 – 2 hours (adjustable) the lighting is switched off completely.

It is also possible to connect an SD-1 module to increase lighting gently and slowly. This means that the lighting is turned up slowly when switching from a low lighting level to a higher level. A potentiometer is used to adjust the time it takes to reach maximum level. The order number for SD-1 is 13173.
See application 2F for a more detailed description of the control system.

4. Photocopier rooms. This room is visited sporadically and visitors are relatively mobile. Detection is by means of a ceiling-mounted IR detector with 360 degree detection area.

The system is fully automated and the lighting is switched on whenever someone enters the photocopying room and is switched off after the set delay when the room is empty.
Do not use this ceiling detector for stationary work at desks! See “Performance comparison” under “Other information” in the “Planning Guide”. For wiring, see application 6D.

5. Coffee rooms. Presence in a coffee room is detected with a PD-2200 IR detector with 51 lens. The lenses are masked and the detectors are aimed so that only the chosen area is watched. Lenses are masked using a special tape. The sensitivity of the detector can also be turned down, which has the effect of reducing the detection area.
In this room, which has large windows and is not intended for work, the light sensor in the IR detector is used. The light sensor prevents the lighting from being switched on if the natural light level exceeds the set value. When the natural light is insufficient the lighting is switched on automatically when someone enters the coffee room. When no one is present the lighting is switched off automatically.
For wiring, see application 3A.

6. Meeting rooms. Presence in the meeting room is detected by a PD-2200 IR detector with 51 lens.

To exploit the hidden savings potential available in all areas that have natural lighting, the installation should include an on/off logic module that prevents the lighting from being switched on when someone enters. All activities may not require more lighting than the available natural light, so personal needs should decide when lighting is switched on. This means that the lighting is switched on and off in the usual way using a pushbutton. The detector only comes into action when someone forgets to switch a light off.

This situation uses a control system with EX-13 logic module. This can be used to control up to four groups of lighting. The lighting is divided into ceiling lighting, blackboard lighting and spot lighting of interior features. EX-13 also has a separate channel for controlling ventilation. It switches on automatically and switches off after an extra long delay (adjustable) so that the premises can be ventilated after a meeting ends.
If dimmable light fittings are used, the lighting can be dimmed manually using a potentiometer in each room. The simplest alternative is analogue light fittings with 1 – 10 V control. If a dimmer with a maximum level limit (order no. 13172) is used, a saving of around 80 per cent (adjustable) is possible at full light intensity.
For wiring, see application 3B.

7. Office rooms.
In office rooms and other smaller rooms it is usually difficult to justify an investment in lighting control by presence detection on financial grounds alone. The investment cost using existing technology is too high in relation to the saving that can be made. Often the investment can be justified by including other benefits in the costing, such as environmental savings and comfort improvements. Future rises in energy costs, improvements in technology and falling costs of technology can also make it profitable to invest in lighting control by presence detection in office rooms.

Detection in office rooms is achieved using a PD-2200 IR detector fitted with a high-resolution 52 lens. An EX-11 logic module allows the lighting to be switched on manually and turned off automatically when the room is empty. A single EX-11 can be used to control two office rooms.

If dimmable light fittings are used the lighting can be dimmed manually using a potentiometer in each room. The simplest alternative is analogue light fittings with 1 – 10 V control. If a dimmer with a maximum level limit (order no. 13172) is used, a saving of around 80 per cent (adjustable) is possible at full light intensity.
For wiring, see application 9A.