Instrument care Wipe cells dry with lint free tissue before inserting into instrument.
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Transcript of Instrument care Wipe cells dry with lint free tissue before inserting into instrument.
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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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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
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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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