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Organic  Removal  Cartridge
OXYGEN   ANALYZERS

Fire Controlman Volume 04-Fire Control Maintenance Concepts
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Oxygen   Removal   Cartridge:  The   oxygen removal   cartridge   is   composed   of   anion   (negative charge)  resins  that  remove  oxygen  from  the  water  by ion  exchange  of  sulfite  ions  to  sulfate  ions.  By  con- ducting  a  standard  oxygen  test  (if  the  cooling  system has   an   oxygen   analyzer   installed),   you   can   test   the quality  of  the  outlet  water  from  the  demineralizer  for oxygen  content  so  that  you  will  know  when  to  replace an   oxygen   cartridge.   When   the   oxygen   cartridge   is near  exhaustion,  it  will  have  a  urine  odor,  which  is given  off  by  the  sulfate. Mixed-Bed   Cartridge:   The  mixed-bed  car- tridge  is  filled  with  cation  (positive  charge)  and  anion (negative  charge)  resins,  which  remove  solids,  dis- solved  metals,  and  carbon  dioxide.  The  charged  resins exchange  ions  with  the  contaminates,  thereby  remov- ing  them  and  leaving  pure  deionized  coolant.  Replace the  mixed-bed  cartridge  when  the  purity  meter  indi- cates  a  low  outlet  purity. Two   conductivity   cells   monitor   the   coolant through  the  demineralizer.  The  first  cell  measures  the purity   of   the   coolant   as   it   enters   the   demineralizer. The  second  cell  measures  the  purity  of  the  coolant  as it   leaves   the   demineralizer   A   conductivity   cell   con- sists  of  two  electrodes  immersed  in  the  coolant  flow path.  The  electrodes  measure  the  conductivity  of  the coolant,  which  varies  with  the  amount  of  ionized  salts dissolved  in  it.  If  the  impurity  content  increases  in  the coolant,  the  purity  meter  indicates  higher  conduct- ance. On  some  purity  meters,  the  purity  of  the  coolant  is displayed  as  resistivity.  In  this  typeof  meter,  an  in- crease  in  the  impurity  of  the  coolant  causes  the  meter to  indicate  a  low  resistivity.  Conductance  is  the reciprocal  of  resistance,  and  is  measured  in  siemens. Figure  2-21  shows  a  purity  meter. Figure 2-21.—Purity meter. Resistivity  is  measured  in  megohms/cm.  You  can convert  from  conductivity  to  resistivity  by  taking  the reciprocal  of  conductivity.  Similarly,  the  reciprocal  of resistivity  is  equal  to  the  conductivity.  A  comparison of  both  ways  of  measuring  the  purity  of  the  coolant is  shown  in  table  2-1. Table  2-1.—Distilled-Water  Resistivity  Versus  Conductivity  Data 2-22






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