msa190-10
2010-12
page 4
3 TEST PROCEDURES
The methodologies listed here are for use with the Pooltest 3 and Pooltest 6 instruments.
Before attempting to do any tests, ensure you read ‘Blanks and Samples’ and the ‘Care and Maintenance’ sections in Section 2.
To Select the Test
Press the MENU key.
The currently selected test will appear on the display:
• Cl
2
5
Chlorine [Free and Total]
(0.01 – 5 mg/L range)
• pH
pH
(pH Units)
• CNA
Cyanuric Acid
To change the test selected, press the MENU key repeatedly until the required test appears on the display.
The ranges in each test refer to the lower limit of detection to the highest value the unit can guarantee confidence up to.
Chlorine
Range
Cl
2
5: 0.01 to 5 mg/L
Wavelength – 530 nm
Method – DPD
Free Chlorine
1 Rinse test tube with sample leaving two or three drops in the tube.
2 Add one DPD No 1 tablet (or DPD-XF for high range instruments), crush the tablet with the crushing rod and then fill the test tube with sample to the
10 ml mark.
Mix gently with the rod to dissolve the tablet and ensure any remaining particles have settled.
3 Take photometer reading immediately as the result may drift on standing. Ensure the display shows the test range that you desire.
4 Retain test solution if Total Chlorine test required (see further on for more instructions).
Total Chlorine
1 Carry out this test on the solution remaining from the Free Chlorine test.
2 If any non chlorine shock treatment chemicals have been added to the pool, see addit ional notes further on
3 Add one DPD No 3 tablet (or DPD-XT for high range instruments), crush and mix to dissolve.
4 Stand for two minutes.
5 Take photometer reading.
Ensure the display shows the test range that you desire.
To obtain COMBINED CHLORINE residual, subtract Free Chlorine result from Total Chlorine result:
i.e. Combined Chlorine = Total Chlorine - Free Chlorine
For notes on chlorine testing, see further on.
Notes
• If any non chlorine shock treatment chemicals have been added to the pool, add one DPD Oxystop (AP 017) tablet, crush and mix to dissolve prior to
adding the DPD No 3 tablet to the test solution.
Stand for one minute before proceeding.
This will prevent a response caused by the shock treatment chemicals.
