Hanna Instruments HI 83203 Instruction Manual

20 21 Free Chlorine• Press ZERO key. The meter will show “-0.0-” when the meter is zeroed and ready for measurement.• Remove the cuvette.Powder reagents procedure• Add the content of one packet of HI 93701-0 DPD reagent.Replace the cap and shake gently for 20 seconds (or 2 minutes forof seawater analysis).• Wait for a minute to allow the undissolved reagent to precipitateand reinsert the cuvette into the instrument.• Press TIMER and the display will show the countdown prior to the measurement or, alternatively, waitfor 1 minute and press READ. When the timer ends the meter will perform the reading. The instrumentdisplays the results in mg/L of free chlorine.Liquid reagents procedure• To an empty cuvette add 3 drops of HI 93701A-F DPD1indicator and 3 drops of HI 93701B-F DPD1 buffer. Swirlgently to mix, and immediately add 10 mL of unreactedsample. Replace the cap and shake gently again. x 3x 3FREE CHLORINEFREE CHLORINEFREE CHLORINEFREE CHLORINEFREE CHLORINESPECIFICATIONSRange 0.00 to 2.50 mg/LResolution 0.01 mg/LAccuracy ±0.03 mg/L ±3% of readingTypical EMC ±0.01 mg/LDeviationLight Source Tungsten lamp with narrow band interference filter @ 525 nmMethod Adaptation of theEPA DPD method 330.5. The reaction between free chlorine and theDPD reagent causes a pink tint in the sample.REQUIRED REAGENTSPOWDER:Code Description QuantityHI 93701-0 DPD 1 packetLIQUID:Code Description QuantityHI 93701A-F DPD1 Indicator 3 dropsHI 93701B-F DPD1 Buffer 3 dropsREAGENT SETSHI 93701-F Reagents for 300 tests (liquid)HI 93701-01 Reagents for 100 tests (powder)HI 93701-03 Reagents for 300 tests (powder)For other accessories see page 46.MEASUREMENT PROCEDURE• Select theFree Chlorine method using the proceduredescribed in theMethod Selection section (see page 11).• Fill the cuvette with 10 mL of unreacted sample (up tothe mark) and replace the cap.• Place the cuvette into the holder and close the lid.Free ChlorineFREE CHLORINE10 mL