㈜굿모닝계측기    oxygen analyzer:   electrolytic oxygen analyzers  oxygen analyzer:   electrolytic oxygen analyzers    oxygen analyzers  electrolytic oxygen analyzers  principle of operation  
two types of electrolytic or galvanic sensors :
-hersch
-micro fuel cell
  oxygen analyzers  electrolytic oxygen   analyzers  principle of operation  in the presence of oxygen,   galvanic cells (or battery cells)   develop an electromagnetic field   as the result of a chemical   
reaction.
(갈바닉셀은, 산소와의  화학반응의결과로서전자기장을  발생시킨다.)  current is measured and   calibrated to the oxygen   concentration  (여기서발생한전류를  측정하고, 산소의함량에대해  교정한다.)    oxygen analyzers  electrolytic oxygen analyzers  principle of operation  
a depleting sensor has a measurement reaction
that consumes the anode  (소모성센서의경우, 전극을소모시키는  반응으로전류를발생시킨다.)  the electrode lifetime is limited   (전극의수명이제한적이다.)    oxygen analyzers  electrolytic oxygen   analyzers:  herschcell  principle of operation  sensitive, uhp versions have ldl down   to 1 ppb  (측정이민감하고, 초고순도용은최저  1ppb 까지측정이가능)  sample is in direct contact with the   electrolyte & contaminants can quickly   degrade the electrolyte and possibly   poison the silver cathode  (시료는전해액과직접접촉&   오염물질은전해액의품성을급격히  떨어뜨리게되어전극에악영향을  미친다.)  cathodecathodeanode  protection  electrodeelectrode  samplesample  koh electrolyte  oh      oxygen analyzers  electrolytic oxygen   analyzers:  herschcell  principle of operation  bubbling sample gas causes rapid   evaporation and requires frequent   water addition, which can cause   spiking.bubbling causes noise, and   the sensor is very sensitive to   sample flow changes  (거품을일으키는시료가스는수분의  증발을야기시킨다.거품은noise를  발생시키기때문에시료의양변화에  민감하게반응한다.)  cathodecathodeanode  protection  electrodeelectrode  samplesample  koh electrolyte  oh      oxygen analyzers  electrolytic oxygen   analyzers:  micro fuel cell  principle of operation  measures % to ppmlevels  (% ~ ppm까지측정가능)  low cost disposable sensor with   
limited lifetime.
(저가, 제한된수명때문에특정시간  동안사용후폐기한다.)       membrane  cathode  anode  electrolyte  sample    oxygen analyzers  electrolytic oxygen   analyzers:  micro fuel cell  principle of operation  some versions flow sensitive  (메이커에따라, 시료의양변화에  민감하게반응하는경우도있다.)  membranes can be contaminated   and make the oxygen shock effect   
worse.
(menbrane이오염되면 oxygen   shock effect를더악화시킬수있다.)       membrane  cathode  anode  electrolyte  sample    oxygen analyzers  electrolytic oxygen   analyzers:  micro fuel cell  principle of operation  contamination can also poison the   cathode and cause the electrolyte to   degenerate  (오염물질은전극에악영향을주어  전해질의변질을가져올수있다.)       membrane  cathode  anode  electrolyte  sample    oxygen analyzers  electrolytic oxygen analyzers  advantages (micro fuel cell)  (장점)  low cost  (저가)  
sensor is a “commodity”to be replaced as needed
(센서는필요시마다쉽게구하여쉽게교체가가능하다.)
  oxygen analyzers  electrolytic oxygen analyzers  disadvantages (micro fuel cell)  (단점)  sensors have to be replaced regularly  (센서는정기적으로교체해야한다.)  
transmitters / analyzers have to be calibrated regularly   (이하 생략)