Transcript Module 3 - Instrument care, changing ranges, calibration check

Chlorine testing with HACH colorimeters
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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Chlorine testing with HACH colorimeters
Instrument settings - HACH Pocket Colorimeter
• Two ranges


Low
High
(0.00 – 2.20 mg/L).
(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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Chlorine testing with HACH colorimeters
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 testing with HACH colorimeters
Chlorine calibration secondary standards
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Chlorine testing with HACH colorimeters
Chlorine calibration secondary standards
These standards have a use-by date and
must not be used after they expire.
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Chlorine testing with HACH colorimeters
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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Chlorine testing with HACH colorimeters
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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Chlorine testing with HACH colorimeters
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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Chlorine testing with HACH colorimeters
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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Chlorine testing with HACH colorimeters
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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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
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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
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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
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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.
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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)
b)
c)
d)
Low light error
Unstable reading
Low battery message
Improper calibration
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Chlorine testing with HACH colorimeters
Quiz 3- Answer
What does an error message of E2 mean?
a) Low light error
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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
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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
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Chlorine testing with HACH colorimeters
Quiz- Question 5 of 6
The proportion of hypochlorous acid depends
on
.
a)
b)
c)
d)
pH
temperature
the ratio of chlorine and ammonia
all of the above
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Chlorine testing with HACH colorimeters
Quiz 5- Answer
The proportion of hypochlorous acid depends
on
.
d) all of the above
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Chlorine testing with HACH colorimeters
Quiz- Question 6 of 6
Which of the following statements is true?
a)
b)
c)
d)
Free chlorine is hypochlorous acid (HOCl )
Total chlorine = HOCl + Combined chlorine
Combined chlorine is the sum of all chloramines
All of the above
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Chlorine testing with HACH colorimeters
Quiz 6- Answer
Which of the following statements are true?
d) All of the above
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Chlorine testing with HACH colorimeters
Summary
This section covered:
•
The importance of chlorine testing
•
Chlorine testing procedures
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