| abstract |
A CO 2 -sensitive planar sensing device is disclosed, which has an electrode with an ion-selective layer, an electrolyte layer and an outer layer. The electrolyte layer has osmotically active species in an amount of 0.8-6.0 milliosmol per m 2 of electrolyte layer area, and has a hydrophilic osmolarity increasing component which does not add bicarbonate ions or chloride ions to the electrolyte layer. |