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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.

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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.

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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

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Chlorine calibration secondary standards

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Chlorine calibration secondary standards

These standards have a use-by date and must not be used after they expire.

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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.

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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}

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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

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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

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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.

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Quiz- Question 1 of 6

Chlorine is added to water because it forms the main barrier in the disinfection process.

a) Trueb) False

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Quiz 1- Answer

Chlorine is added to water because it forms the main barrier in the disinfection process.

a) True

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Quiz- Question 2 of 6

Calibration check can be carried out in both the Low range or High range settings.

a) Trueb) False

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Chlorine testing with HACH colorimetersChlorine 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.

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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 errorb) Unstable readingc) Low battery messaged) Improper calibration

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Quiz 3- Answer

What does an error message of E2 mean?

a) Low light error

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Quiz- Question 4 of 6

When sampling water, it is important to replace the sample cell cap immediately to prevent loss of chlorine.

a) Trueb) False

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Quiz 4- Answer

When sampling water, it is important to replace the cap immediately to prevent loss of chlorine.

a) True

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Quiz- Question 5 of 6

The proportion of hypochlorous acid dependson .

a) pH b) temperaturec) the ratio of chlorine and ammoniad) all of the above

Click here for answer.

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Quiz 5- Answer

The proportion of hypochlorous acid dependson .

d) all of the above

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Quiz- Question 6 of 6

Which of the following statements is true?

a) Free chlorine is hypochlorous acid (HOCl )b) Total chlorine = HOCl + Combined chlorinec) Combined chlorine is the sum of all chloraminesd) All of the above

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Quiz 6- Answer

Which of the following statements are true?

d) All of the above

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Summary

This section covered:

• The importance of chlorine testing

• Chlorine testing procedures

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