70 CHEMICAL SENSORS. VOLUME 5: ELECTROCHEMICAL AND OPTICAL SENSORS Figure 1.38. Schematic drawing of a solid-state device based on an inorganic salt. (Reprinted with permission from Miura et al. 1998. Copyright 1998 Elsevier.) tests as a model hydrocarbon. The solid-state electrochemical cell based on YSZ operates in the ampero-