PIR detector

Passive infra-red quad person detector.

Adjustable time lag

Time lag adjustable in 9 steps (approximate values):

10 seconds 20 seconds 40 seconds
1.25 minutes 2.5 minutes 5 minutes
10 minutes 20 minutes 40 minutes

Adjustable photocell

The "Inhibit on" photocell on most models will inhibit the lights from switching on when somebody enters an area with plenty of ambient light. However, if somebody is already occupying an area with the lights switched on, the lights will remain on while the area is occupied, regardless of any increase in the ambient light level. This is to avoid any nuisance switching off when somebody is in the middle of a task or meeting. Range 100-1000 lux (and photocell inactive), falling on the working plane.

The “Intelligent” photocell on some batten mount controls enables even greater energy savings because in its calibration process it learns to ignore the artificial lighting load (Patent pending, GB Patent application 1219746.3). It is recommended the “Intelligent” batten mount controls are only used in areas with some natural daylight. Range 100-3000 lux falling on the working plane.


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.

Wiring in parallel

A few PIR switches can be wired in parallel to control the same load.

Start-up Mode

When the mains supply is initially connected to the PIR occupancy switch it goes through its Start-up Mode. This means it switches on for about 1 minute, then switches off and enters its Operating Mode. If a manual wall switch is feeding the PIR occupancy switch (see wiring diagrams on appropriate product pages) then it will go through the Start-up Mode each time the wall switch is switched on (not applicable to WAPIR).

By wiring the manual wall switch in the alternative position, the supply to the PIR occupancy switch is uninterrupted and it remains in Operating Mode. It does not go through its Start-up Mode each time the wall switch is switched on.