Operating and monitoring systems from the Screen-Tec T-Ex series (photo) feature a trackball that provides users with new operating options. Equipped with five push buttons, the trackball can be operated with one or both hands. The membrane keyboard/trackball unit and the display are suitable for clean rooms and rough environments in the chemical and petrochemical industries. The T-Ex series, which includes 19-, 22- and 24-in. displays, is said to be the first HMI series that can display standard screen formats as well as modern widescreen formats in Zone 1, 2, 21 and 22 hazardous areas. — R. Stahl HMI Systems GmbH, Cologne, Germany
Operate this trackball with one or two hands
| By Chemical Engineering