The display series from PR electronics is characterised by its flexibility and reliability. Operating parameters such as limit values, relay postponement, scaling and placement of commas, 4-digit LED, front key / pc programmable, 48×96 mm. Model 5531: 4-digit LCD instrument for Ex applications, universal input and supply capabilities can be installed in zone 0, 1 and 2. The visibility in darkness is a unique feature of this display due to the flexible setting of luminosity.