The PARVIS SMA WS range has a single column containing dual-optic beams in AND mode with SMA technology, both TX and RX (2 + 2 or, at the most, 3 + 3), recognised automatically by the new control boards guaranteeing improved performance and lower power draw. The life of the batteries, which vary in relation to the number of beams inside the columns, lasts 36 months on average. The low battery signal is given through a buzzer, when the beams are interrupted.
Also in this product range, the synchronism is optical, while for obvious reasons there is no thermostating. As a result, the TX–RX range is reduced to 50 metres, in order to prevent potential false alarms in adverse weather conditions. Through dip-switches it is possible to programme the OR/AND functions, crossing speed and the activation of the fog disqualification function. The alarm and tamper signals are given through two distinct outputs which are then connected to the most common radio transmitters available on the market.