Sunlight readable displays for explosion-protected HMI systems

Many important operating and monitoring tasks are carried out at HMI systems installed outdoors. This can only be done safely and easily if the displays do not reflect ambient light too strongly. Thanks to the new solution, bulky canopies that were supposed to give shade but in practice hardly did so to a sufficient degree are no longer necessary. High Brightness displays, which caused thermal problems in explosion-protected systems in particular and which were similarly useless against glare, are also no longer necessary, as the new package does not require particularly bright LEDs. Unlike any standard filters used so far, this filter pack hardly affects the image display for viewers: although the sunlight readable displays can be adjusted to up to 1,000 cd/m², they are already easily readable even in direct sunlight with a luminescence of 700 to 800 cd/m². Certified for hazardous gas and dust explosion zones 1, 21, 2 and 22, the Open HMIs are fitted with low-energy CPUs from the Intel Atom series and consist of explosion-protected modules. These touchscreen systems can be operated in rugged environments and even at continuously extreme ambient temperatures between -30 °C and +50 °C. Numerous international certifications ensure suitability for various applications in a wide range of industries, such as the oil and gas sector, package units and the chemical and pharmaceutical industries.

Illustrations: The displays of conventional HMI systems show a distinct glare in strong sunlight (Sunlight1), while innovative displays ensure much better readability (Sunlight2).