ZS 90 SR belt-alignment switch

The enclosure of the ZS 90 SR is made out of fibreglass-reinforced Duroplast. It is carefully encapsulated in accordance with protection class IP 67, meaning that neither moisture nor abrasive dusts can penetrate to the interior of the enclosure. Its attachments, such as a 50mm roller to monitor belt position, are made out of non-corrosive stainless steel. Since it can be used in temperatures ranging from -40 to 80°C, it is also suitable for outdoor applications. A separate connector box protects the connections from the weather and other factors. The switch also features a preliminary warning function employing step-wise contacts. When the belt alignment roller assumes the 15° position, two out of the four contacts in the switch connect, triggering a warning signal. In the 25° position, the other two contacts also connect, switching off the system off.