User manual HANNA INSTRUMENTS HI 38020

[. . . ] DPD Total Chlorine reagent. HI 38020 Free & Total Chlorine Low, Medium and High Range Test Kit with Checker Disc Smallest Increment Analysis Method Sample Size Number of Tests Case Dimensions Shipping Weight · Use the pipette to fill each glass vial with 10 mL of sample (up to the mark). 10 mL SIGNIFICANCE AND USE www. hannainst. com · Insert one of the vials into the left hand opening of the checker disc. This is the blank. · Replace the cap and mix. · In the case of Total Chlorine determination, wait for 2 minutes to allow reaction to occur. · Remove the cap and insert the reacted sample into the right hand opening of the checker disc. [. . . ] Free chlorine reacts with ammonium ions and organic compounds to form chlorine compounds resulting in diminished disinfecting capabilities compared with free chlorine. Chlorine compounds together with chloramines form combined chlorine. Combined chlorine and free chlorine together result in total chlorine. While free chlorine has a much higher disinfectant potential, combined chlorine has a much higher stability and has a lesser volatility. Note: mg/L is equivalent to ppm (parts per million). · Remove the cap and fill the Demineralizer Bottle with tap water. · Replace the cap and shake gently for at least 2 minutes. · Flip open the top of the Demineralizer Bottle cap. By gently squeezing the bottle, add demineralized water to the other vial up to the 20 mL mark. Replace the cap and shake to mix. 02/00 CHEMICAL REACTION The reaction between chlorine and the DPD reagent causes a pink tint in the sample which is proportional to the chlorine concentration. ISTR38020 · To measure chlorine in the 0-3. 5 mg/L range, remove the disc, mirror and its holder, if pre-installed. Then install just the 3875 disc as shown here. · Use the pipette to fill each glass vial with 5 mL of sample (up to the mark) 5 mL and insert one of them into the left hand opening of the checker disc. · Add to the other vial demineralized water up to the 10 mL mark and shake to mix. · · · · window directly in mg/L (or ppm) of Chlorine. To measure chlorine in the 0-10. 0 mg/L range, remove the disc, mirror and its holder, if pre-installed. Then install just the 38020 disc as shown here. Use the pipette to fill one of the glass vials with 5 mL of sample. This is the blank; insert it into the left hand opening of the checker disc. Use the pipette to fill the other glass vial with 2. 5 mL of sample (up to the 2. 5 mL mark). Add demineralized water up to the 15 mL mark and shake to mix. · Keep the checker disc at a distance of 30-40 cm (1216") from the eyes to match the color. Rotate the disc while looking at the color test windows and stop when you find the color match. Read the value in the result window directly in mg/L (or ppm) of Chlorine. For best results: Perform the reading three times and take the average value (divide by 3 the sum of the three numbers). [. . . ] · Keep the checker disc at a distance of 30-40 cm (1216") from the eyes to match the color. Rotate the disc while looking at the color test windows and stop when you find the color match. Read the value in the result · Replace the cap and mix. In the case of Total Chlorine determination, wait for 2 minutes to allow reaction to occur. [. . . ]