THE new W4-2 Teflon series of photoelectric switches, from SICK , has been designed for use in cases where reliable detection of transparent objects is vital, but harsh environmental conditions necessitate a special sensor design.
In order to withstand aggressive media, detergents, vapours or permanent dampness, the sensor is accommodated in an IP68 Teflon housing and the cable coated with Teflon. Despite this long ranges reliable switching behaviour and high immunity to ambient light can be achieved, making the switches useful for food, chemical or semiconductor industries.
The W4-2 Teflon series, in its sugar-cube-sized housing, consists of a through-beam photoelectric switch with a range of 3m, and a photoelectric proximity switch with background suppression and a scanning distance of 80mm.
A version is available for applications in which glass or transparent objects such as bottles, quartz wafers or TFT liquid crystal displays must be detected.
The series meets the high standards of the food and semiconductor industries. As a result of the complete Teflon coating, there switches have a smooth surface and there are no recesses where dirt can accumulate. The W4-2 Teflon meets the demands necessary for use in, for example, the food and semiconductor industries.
The sensor fulfils the requirements of the US Federal Drug Administration's 21 CFR 177.1550 regulations, as well as those of the SEMI E49.2-0298 and F57-0301 standards.