Hach CN-70, CN-70F, CN-70T User Manual

Chlorine Test Kit

CN-70 (1454200), CN-70F (1454201), CN-70T (1454202)

DOC326.98.00003

Test preparation

CAUTION: Use the recommended personal protective equipment.

NOTICE: This product has not been evaluated to test for chlorine and chloramines in medical applications in the United States.

• Analyze samples immediately after collection.

• Put the color disc on the center pin in the color comparator box (numbers to the front). Use sunlight or a lamp as a light source to find the color match with the color comparator box.

•

• Rinse the tubes with sample before the test. Rinse the tubes with deionized water after the test.

• If the color match is between two segments, use the value that is in the middle of the two segments.

• If the color disc becomes wet internally, pull apart the flat plastic sides to open the color disc. Remove the thin inner disc. Dry all parts with a soft cloth. Assemble when fully dry.

• The long-path adapter for the low range test shows the color in the tubes from top to bottom. Make sure the light source is above the tubes during the color match.

• Undissolved reagent does not have an effect on test accuracy.

• For free chlorine, read the result immediately after the reagent is added to prevent interference from monochloramine. If the sample contains 3.0 mg/L monochloramine, the free chlorine result increases each minute by 0.1 mg/L.

• If the low range test result is more than the maximum limit, use the mid range test procedure with a fresh sample.

Test procedure—Free or total chlorine, low range (0–0.68 mg/L Cl2)

Review the Safety Data Sheets (MSDS/SDS) for the chemicals that are used.

Replacement items

Description Unit Item no.

DPD Free Chlorine Reagent Powder Pillows, 25 mL 100/pkg 1407099 DPD Total Chlorine Reagent Powder Pillows, 25 mL 100/pkg 1406499 Bottle, square, with 25-mL mark each 1704200 Color disc, DPD chlorine, 0–3.4 mg/L each 990200 Color comparator box each 173200 Long-path adapter each 2412200 Plastic viewing tubes, 18 mm, with caps 4/pkg 4660004

Optional items

Description Unit Item no.

Caps for plastic viewing tubes (4660004) 4/pkg 4660014 Glass viewing tubes, glass, 18 mm 6/pkg 173006 Stoppers for 18-mm glass tubes and AccuVac Ampuls 6/pkg 173106 Water, deionized 500 mL 27249

1. Install the long-

path adapter in the color comparator box.

2. Fill a tube to the top line with sample.

3. Put the tube into the left opening of the color comparator box.

4. Fill the bottle to the 25‑mL mark with sample.

5. Add one DPD (Free or Total) Chlorine Powder Pillow. Swirl to mix.

6. For free chlorine, read the result within 1 minute. For total chlorine, wait 3 minutes. Read the result within 6 minutes.

7. Fill a second tube to the top line with the prepared sample.

8. Put the second tube into the color comparator box.

9. Hold the color comparator box below a light source. Turn the color disc to find the color match.

10. Read the value in the scale window. Divide the value by 5 to get the result in mg/L.

Test procedure—Free or total chlorine, mid range (0–3.4 mg/L Cl2)

1. If installed,

remove the longpath adapter.

2. Fill a tube to the first line (5 mL) with sample.

3. Put the tube into the left opening of the color comparator box.

4. Fill the bottle to the 25‑mL mark with sample.

5. Add one DPD (Free or Total) Chlorine Powder Pillow. Swirl to mix.

6. For free chlorine, read the result within 1 minute. For total chlorine, wait 3 minutes. Read the result within 6 minutes.

7. Fill a second tube to the first line (5 mL) with the prepared sample.

8. Put the second tube into the color comparator box.

9. Hold the color comparator box in front of a light source. Turn the color disc to find the color match.

10. Read the result in mg/L in the scale window.

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