1. Characteristics of oxygen sensor (KE-25 KE-50):  
(1) Long life (KE-25-5 years, KE-50-10 years) 
(2) Not affected by CO2, CO, H2S, NOx, H2 
(3) Low cost  
(4) Working at normal temperature     
(5) Signal output setting  
(6) No external power supply required  
(7) No heating

Second, the oxygen sensor (KE-25 KE-50) performance:
(1) Measuring range   0-100% O2       
(2) Accuracy   KE-25: ±1% (full scale); KE-50: ±2% (full scale)
(3) Working temperature   5～40℃         
(4) Storage temperature   -20～＋60℃       
(5) Response time   KE-25: 14±2 seconds; KE-50: 60±5 seconds
(6) Initial output  KE-25: 10.0–15.5mv; KE-50: 47.0-65.0mv
(7) Life expectancy   KE-25: 5 years; KE-50: 10 years