figaro product information gs oxygen sensors, model ke-series, are newly developed galvanic cell type sensors. by using acid electrolyte, the sensor has an exceptionally long life and excellent chemical durability. features * long life ke-25 - 5 years KE-50 - 10 years *virtually no influence from co 2 , co, h 2 s, nox, h 2 * low cost * operates in normal ambient temperatures * stable output signal * no external power supply required for sensor operation * no warmup time is required gs oxygen sensors applications medical: anesthetic instruments, respirators, oxygen- enrichers biotechnology: oxygen incubators food industry: refrigeration, greenhouses safety: air conditioners, oxygen detectors, fire detectors structure of ke-25 / KE-50 principle gs oxygen sensors incorporate a lead oxygen cell with a lead anode and a gold cathode, using a specific acid electrolyte. oxygen molecules diffuse through a non-porous fluorine resin membrane into the electrochemical cell and are reduced at the gold electrode. the current flowing between the electrodes is proportional to the oxygen concentration in the gas mixture to be measured. the signals are measured as terminal voltages of the resistor and the thermistor for temperature compensation. the change in output voltages represents the oxygen concentration. lead wire (anode) lead wire (cathode) anode (lead) o-ring plasticdisc plastic ring black red resistor thermistor acid electrolyte sponge disc cathode (gold film) teflon membrane specifications l e d o m 5 2 - e k 0 5 - e k e g n a r t n e m e r u s a e mo % 0 0 1 ~ 0 2 o % 0 0 1 ~ 0 2 y c a r u c c a ) e l a c s l l u f ( % 1 ) e l a c s l l u f ( % 2 e r u t a r e p m e t g n i t a r e p oc ? 0 4 ~ 5c ? 0 4 ~ 5 e r u t a r e p m e t e g a r o t sc ? 0 6 + ~ 0 2 -c ? 0 6 + ~ 0 2 - ) % 0 9 ( e m i t e s n o p s e r4 1 s d n o c e s 20 6 s d n o c e s 5 e g a t l o v t u p t u o l a i t i n i o % 1 2 t a ( 2 s n o i t i d n o c t s e t d t s d n a ? 5 2 f o 0 6 , c ? 1 3 1 0 1 , h r % 5 ) a p h 5 v m 5 . 5 1 ~ 0 . 0 1v m 5 6 ~ 7 4 y c n a t c e p x e e f i l s r u o h % 0 0 0 , 0 0 9 . x o r p p a ) r i a c ? 0 2 n i . s r y 5 . x o r p p a ( s r u o h % 0 0 0 , 0 0 8 , 1 . x o r p p a ) r i a c ? 0 2 n i . s r y 0 1 . x o r p p a ( remarks: life expectancy is specified as % hours (o 2 concentration % x hours)
rev: 08/01 sensitivity characteristics (typical values under std. test conditions) dimensions handling instructions response time (typical) * prevent condensation on the sensing element. * do not subject the sensor to excessive shock or vibration. * the sensor must be connected to equipment which has an input impedance of 1000k w or higher. 0 20 40 60 80 100 120 0 30 60 90 120 150 180 time (sec.) output ratio (%) KE-50 ke-25 0 0 oxygen concentration (%) output voltage (mv) 325 300 250 200 150 100 50 10 20 30 40 50 60 70 80 90 100 KE-50 ke-25 oxygen ke- no.94 japan storage ?8 0.5 22.5 0.3 80 5 4 2 47.3 0.5 5 ?3.2 0.5 13 15 ? ? lead wire unit=mm * the equipment to which the sensor is connected should not generate a counter electromotive force, i.e. it must not charge the sensor. * do not attempt to disassemble or repair the sensor under any circumstance. ke-25/KE-50 standard version m16 x p1.0 f 23 0.5 8 50 0.5 f 9 1.5 22.7 0.5 f 23 0.5 22.7 0.5 f 23 0.5 f 16 f 16.6 f 9 4.5 2.5 15 57 0.5 ke-25f3 (threaded top) ke-25f4 (o-ring top) unit=mm unit=mm
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