A light-emitting device used in a linear array of a plurality of them includes a semiconductor light-emitting element, a substrate on which the semiconductor light-emitting element is mounted, and a light-transmitting sealing resin formed on the front surface of the substrate to seal the semiconductor light-emitting element. There is very little difference between the thermal expansion coefficients between ADI and aluminum materials, ensuring that the bearing operates reliably even when there are fluctuations in temperature. A producer node multicasts data updates to selected data matrix nodes in the data matrix layer, and a consumer node registers with the data matrix layer to receive designated data updates. The complete set of individual encrypted segments is staged to a plurality of intermediate control nodes. Using an ALD method, the measuring cell is coated in a vacuum chamber, in particular through the opening of the measuring cell, such that the inner wall of the measuring vacuum chamber and the opening with the connection means is covered with a protective layer such that at least the joining means for the diaphragm is protectively covered against corrosion.