Fibre-optic photoelectric switch

The WLL190T-2 fibre-optic photoelectric switch from Sick has two programmable switching thresholds per device, an additional analog output and a response time of 60 µs. Together with over 80 different fibre-optic cables in the Sick LL3 series, it is suitable for those tasks where little mounting space is available, the sensor head (ie, the fibre-optic cable) must be adapted to meet the needs of the application, or the sensor (as an evaluation unit) must be installed at a distance to the objects to be detected - due to EMC, high temperatures or chemical effects.

Depending on the fibre-optic cable selected, even very small objects can be reliably detected with the WLL190T-2 - at high speeds and over ranges of up to 4000 mm. When implementing different detection tasks, two differing switching thresholds (each with a separate switching output) can be programmed by teach-in via the connection cable. With the help of the analog output, the user can signal object properties such as cloudiness, transmission or positioning to a controller. All programming steps, status indications, and the display of expected and actual values are visualised on two four-digit numerical indicators.

The WLL190T-2 is intended for installation on a mounting rail and can also be operated as an individual sensor or in a sensor group. The device has integrated bus technology that allows up to 16 sensors to be plugged in for interference-free cascading. This reduces the wiring effort and allows the adjustment parameters of one WLL190T-2 to be copied to all the other bus participants.