FCA-22 Free Chlorine Analyzer ELECTRO-CHEMICAL DEVICES

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Vivian Greene
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1 FCA-22 Free Chlrine Analyzer ELECTRO-CHEMICAL DEVICES

2 FCA-22 System Cnfiguratin Free Chlrine Analyzer 1) C22- Analyzer and Cntrller 2) S10- ph with Temperature Sensr 3) Free Chlrine Sensr (FCS) 4) Cnstant Head Flw Cntrller b 4 c d Panel Munted a) Munt per dimensins b) Plumb in ¼ NPT c) Plumb ut ¾ NPT d) Wire the C22 Cntrller a

3 What is Free Chlrine? Chlrine gas (Cl 2 ) disslves in water as Hypchlrus acid (HOCl) and Hypchlrite in (OCl - ). Cl 2 + H 2 O > HOCl + H + + Cl - Sdium Hypchlrite (Bleach) disslves the same way. NaOCl + H 2 0 > HOCl + OH - + Na + The rati HOCl/OCl is ph dependent. pk a = 7.5 HOCl H + + OCl - Free Chlrine is the sum f the Hypchlrus acid and Hypchlrite in in the sample. Free Residual Chlrine is the measured value, FRC. Residual = Dse Demand It is the chlrine available t measure. The FCA-22 desn t measure Ttal Chlrine. Ttal = Free + Cmbined Cmbined Chlrine is chlrine bund t an rganic mlecule Ammnia prducts being the mst cmmn, Chlramines. Ttal Chlrine requires a reagent based wet chemistry technique r a special ampermetric sensr. Use The TCA-22

4 Free Chlrine Sensr Plargraphic Design Externally plarized by the C22 Gld Cathde Silver-Silver chlride Ande Replaceable rugged Tefln Membrane Refillable Ptassium Chlride Electrlyte PVC uter bdy

5 Hw des it Wrk? The C22 applies a fixed vltage acrss the sensr. This plarizatin vltage generates a plarizatin current in the sensr. The current decreases with time and the sensr stabilizes at the zer pint current. The initial plarizatin takes abut 60 minutes. The Chlrine sensr is nw ready t use.

6 Hw Des it Wrk? (cnt d) The Tefln membrane allws nly neutrally charged mlecules t pass thrugh; HOCl is neutral and will pass the membrane. OCl is charged and wn t pass. Salts are charged and wn t pass. Hypchlrus acid, HOCl, diffuses thrugh the membrane and is reduced (gains electrns) at the cathde t frm chlride. Silver is xidized (gives up electrns) at the ande which precipitates the chlride, as silver chlride, cmpleting the current lp. HOCl is directly measured by the sensr and OCl is inferred frm the ph. % HOCl % HOCl % OCl ph Units % OCl

7 Measurement Influences ph Sensitivity Temperature Sensitivity Output increases with mv/ppm Cl temperature, 4% per C Output decreases with 0 cling. Flw Sensitivity The FCA sensr cnsumes chlrine Flw replenishes the chlrine supply Lw flw = Lw reading FCA Temperature Dependence, 4%/C % Theretical utput Temperature C FCA Flw dependence Flwrate, gal/hr

8 Cnstant Head Flw Cntrller The CH Flw Cntrller eliminates the need fr Pressure Regulatrs and Rtameters that wuld be needed t keep the flw cnstant. The unique verflw design maintains a cnstant flw at the sensr with incming variatins between 8 and 80 gal/hr.

9 Where is it used? Chlrinatin f Municipal drinking water Cling Twers Industrial disinfectin f rinse waters Fd prcessing Pasteurizatin lines Bleaching Prcesses Oxidatin in Chemical prcessing Mining Sulfide remval

10 Start up Guide Munt FCA Panel securely t a wall r rail system. Supply pwer t the C22 cntrller as shwn in the Wiring Instructins. Install the FCS and PHD10 sensrs int the flw cells. (The FCS is clsest t the CHFC tube). Cnnect sample line t the ¼ FNPT n CHFC tube. Cnnect drain line t ¾ barb fitting n the bttm f the CHFC tube. Supply sample t the FCA- 22 and let run fr 60 minutes. Verify the Calibratin f the PHS10 ph sensr. Verify the Chlrine reading with a DPD test. IT S DONE!!! Check Calibratin mnthly

11 Electr-Chemical Devices Cntact ECD Fr ver 30 years Electr-Chemical Devices (ECD) has been a recgnized leader in industrial prcess instrumentatin: Liquid analytical sensrs, cntrllers, transmitters, analyzers and electrdes. Electr-Chemical Devices 1681 Kettering Irvine, CA Phne: Fax: sales@ecdi.cm web:

FC80 Free Chlorine Analyzer ELECTRO-CHEMICAL DEVICES

FC80 Free Chlorine Analyzer ELECTRO-CHEMICAL DEVICES FC80 System Configuration Free Chlorine Analyzer 1) Constant Head Flow Controller 2) S80- ph with Temperature Sensor 3) Free Chlorine Sensor (FCS) 4)