PIR occupancy switch functions

Each PIR occupancy switch in the DANLERS range has a passive infra-red quad person detector (except COPD and BMPIR which have a passive infra-red dual person detector). This detects the movement of a warm body moving within its detection zone. When such a movement is detected the load is switched on. There is a time lag function which is adjusted using a spindle on the side of the product. The time lag is the time that must elapse with no movement detected before the PIR occupancy switch will switch off.

There is a built-in, adjustable, photocell override which can be used to keep lights off when there is sufficient daylight available (except “Intelligent” controls such as BMINTPIR5M and BMINTPIR10M). The photocell can only be used in this way if the amount of natural daylight exceeds the level of the artificial lights. The photocell can be set to inactive when controlling heating, ventilation or air conditioning. The photocell is also adjusted by a spindle on the side of the product.

Each PIR occupancy switch contains a relay suitable for switching most types of load, including fluorescent lights, LEDs and fans.


All models can switch up to 6 amps (1500W at 230VAC) of resistive, transformer or fluorescent lighting loads, 2 amps (500W) of low energy lighting loads (LED lamps and compact fluorescent) or up to 1 amp (250W) of fans or most metal halide lamps. For the WAPIR model there are some minimum load requirements.

The PIR occupancy switches require a mains supply.


Function demonstrated with the lighting in an office

PIR occupancy switch brings lights on – only when needed

pir-function-diagram-1 pir-function-diagram-2
Enough daylight, Occupied – Lighting OFF Enough daylight, Unoccupied – Lighting OFF
Night, Occupied – Lighting ON Night, Unoccupied – Lighting OFF
Night, Occupied – Lighting ON Night, Unoccupied – Lighting OFF