1. To go to next page, click on Page- Chlorine testing with HACH colorimeters 22 Instrument care Wipe cells dry with lint free tissue before inserting into instrument. Empty the cells and rinse with de-ionised water. Dry the packing foam if wet. Thoroughly clean and dry unit if wet. Always use the carrying case.

2. To go to next page, click on Page- Chlorine testing with HACH colorimeters 23 Instrument settings - HACH Pocket Colorimeter Two ranges Low (0.00 – 2.20 mg/L). High (0.0 – 4.5 mg/L) Total Only. Switching ranges Press Zero & Read simultaneously. After one second, release the Zero button – keep holding the Read button.

3. To go to next page, click on Page- Chlorine testing with HACH colorimeters 24 Calibration check Monthly Using a DPD Secondary Standard Kit (kept in Regional or District offices) Instrument MUST be in Low range when checking calibration Kit is good for 2 years Store kits in cool place

4. To go to next page, click on Page- Chlorine testing with HACH colorimeters 25 Chlorine calibration secondary standards

5. To go to next page, click on Page- Chlorine testing with HACH colorimeters 26 Chlorine calibration secondary standards These standards have a use-by date and must not be used after they expire.

6. To go to next page, click on Page- Chlorine testing with HACH colorimeters 27 Chlorine calibration check Calibration check must be carried out in the Low Range only. The calibration kit contains a Blank. Only use this Blank with the calibration check and NOT with water samples. The correct standard chlorine concentrations are printed under the lid of the standards kit lid.

7. To go to next page, click on Page- Chlorine testing with HACH colorimeters 28 You need to keep a record of the results for your chlorine colorimeter data sheet Below is an example of a calibration check data sheet Calibration of HACH Pocket Colorimeter – {enter ID Number of Instrument}

8. To go to next page, click on Page- Chlorine testing with HACH colorimeters 29 Accepted tolerance Chlorine values beyond the stated tolerance indicate the colorimeter is out of specification. As a guide, when chlorine values are more than : ± 0.03 mg/L for Std 1 ± 0.03 mg/L for Std 2 ± 0.04 mg/L for Std 3 The unit must be sent to Water Technologies Section for checking – Contact Mr Kevin Xanthis

9. To go to next page, click on Page- Chlorine testing with HACH colorimeters 30 Error messages (for the blue unit) E1 - Unstable Reading E2 - Low Light Error E3 - Low Battery Message E7 - Improper Calibration Flashing 0.00 – Under range Flashing 2.20 – Over range in LO range Flashing 5.0 – Over range in HI range

10. To go to next page, click on Page- Chlorine testing with HACH colorimeters 31 Reporting procedure Water Corporation specifies approved procedures for reporting test results. Use the correct forms supplied at your worksite. Submit them in a timely manner as described at your work site.

11. To go to next page, click on Page- Chlorine testing with HACH colorimeters Quiz- Question 1 of 6 Chlorine is added to water because it forms the main barrier in the disinfection process. a) True b) False Click here for answer.here 32

12. To go to next page, click on Page- Chlorine testing with HACH colorimeters Quiz 1- Answer Chlorine is added to water because it forms the main barrier in the disinfection process. a) True 32

13. To go to next page, click on Page- Chlorine testing with HACH colorimeters Quiz- Question 2 of 6 Calibration check can be carried out in both the Low range or High range settings. a) True b) False Click here for answer.here 33

14. To go to next page, click on Page- Chlorine testing with HACH colorimeters Quiz 2- Answer Calibration check can be carried out in both the Low range or High range settings. b) False Calibration check must be carried out only in the Low range. 33

15. To go to next page, click on Page- Chlorine testing with HACH colorimeters Quiz- Question 3 of 6 When using the original HACH Pocket Colorimeter (blue unit) what does an error message of E2 mean? a) Low light error b) Unstable reading c) Low battery message d) Improper calibration Click here for answer.here 34

16. To go to next page, click on Page- Chlorine testing with HACH colorimeters Quiz 3- Answer What does an error message of E2 mean? a) Low light error 34

17. To go to next page, click on Page- Chlorine testing with HACH colorimeters Quiz- Question 4 of 6 When sampling water, it is important to replace the sample cell cap immediately to prevent loss of chlorine. a) True b) False Click here for answer.here 35

18. To go to next page, click on Page- Chlorine testing with HACH colorimeters Quiz 4- Answer When sampling water, it is important to replace the cap immediately to prevent loss of chlorine. a) True 35

19. To go to next page, click on Page- Chlorine testing with HACH colorimeters Quiz- Question 5 of 6 The proportion of hypochlorous acid depends on. a)pH b)temperature c)the ratio of chlorine and ammonia d)all of the above Click here for answer.here 36

20. To go to next page, click on Page- Chlorine testing with HACH colorimeters Quiz 5- Answer The proportion of hypochlorous acid depends on. d) all of the above 36

21. To go to next page, click on Page- Chlorine testing with HACH colorimeters Quiz- Question 6 of 6 Which of the following statements is true? a) Free chlorine is hypochlorous acid (HOCl ) b) Total chlorine = HOCl + Combined chlorine c) Combined chlorine is the sum of all chloramines d) All of the above Click here for answer.here 37

22. To go to next page, click on Page- Chlorine testing with HACH colorimeters Quiz 6- Answer Which of the following statements are true? d) All of the above 37

23. To go to next page, click on Page- Chlorine testing with HACH colorimeters 38 Summary This section covered: The importance of chlorine testing Chlorine testing procedures To return to first page, click on