A new type of variable frequency oxygen sensor of zirconia solid electrolyte

whose structure is made of sensitive cell and oxygen pump

is introduced.In theory

the response time（t）is proportional to the measured oxygen pressure p1 varies from E1 to E2 of concentration voltage.The detailed experiment data show that the relation of the response time t with the measured oxygen pressure p1 is direct proportional when keeping the concentration voltage E1 and E2 under 200 mV.However

the result of experiment disaccords with theoretic formula when the concentration voltage E1 and E2 exceed 200 mV.Through preliminary analysis

it predicts that the conductance of zirconia solid electrolyte is changed by low oxygen pressure inside chamber when the concentration voltage E1 and E2 exceed 200 mV

which brings the deviation of theoretic derivation.