Light dependent relays enhance lighting control and save energy

Relay contact capacity for the new series has been increased, now supporting 2000W for use with incandescent or halogen lamps and 750W for fluorescent lamps. For increased protection, all new 11 Series products also feature SELV separation between the supply and relay contacts as well as double isolation between the supply and the photoelectric sensor.

With a module width of just 17.5mm, the slim-line 11.31 relay provides a single 16A normally open contact and an adjustable sensitivity from 1 to 100 lux. A low power product, the relay consumes just 300mW in standby mode and is considered to be the smallest of its kind to offer the double isolation protection.

The 11.41 relay provides a single 16A changeover contact and a selector switch with 4 preset lighting positions: standard (1-80 lux), extra (30-1000 lux), on (for installation, testing and maintenance) and off (for holiday periods). The relay also includes two newly patented technologies: 'zero' hysteresis' for enhanced energy saving and 'light feedback compensation' for simplifying installation and use.

he 11.42's two independent outputs with individual lux settings will prove attractive in installations requiring artificial lighting to activate at different levels of ambient lux. An example might be sensing ambient light at an office window and setting the outputs such that lights furthest from the window are switched on first. Contacts are 12A rated, 1 changeover and 1 normally open and the relay features the same selector switch as the 11.41.

The versatile 11.91 also features two outputs, an auxiliary which follows the photoelectric sensor and 16A changeover contact controllable by both the sensor and a built-in daily timer. This facility means for example that shop signage can remain lit during the night, while the window display can be switched off outside trading hours. The relay integrates an LCD panel for timer set-up and programming, sensitivity adjustment from 2 to 150 lux and Finder's light feedback compensation.