Thermo Scientific AQUAfast AQ3700, User Manual

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7 Thermo Scientific Orion AQUAfast AQ3700 Colorimeter User Guide
1.1 Methods
Silica/Silicon dioxide
with Tablet
0.05 – 4 mg/l SiO
2
1. Fill a clean vial (24 mm Ø) with
10 ml of the water sample
,
close tightly with the cap.
2. Place the vial in the sample chamber making sure that
the marks are aligned.
3. Press ZERO key.
4. Remove the vial from the sample chamber.
5. Add one SILICA No. 1 tablet straight from the foil
to the water sample and crush the tablet using a clean
stirring rod.
6. Close the vial tightly with the cap and swirl several times
until the tablet is dissolved.
7. Press [ ] key.
Wait for a reaction period of 5 minutes .
After the reaction period is finished proceed as follows:
8. Add one SILICA PR tablet straight from the foil to the
same water sample and crush the tablet using a clean
stirring rod.
9. Add
one SILICA No. 2 tablet
straight from the foil to
the same water sample and crush the tablet using a
clean stirring rod.
10. Close the cap tightly and swirl several times until the
tablets are dissolved.
11. Place the vial in the sample chamber making sure that
the marks are aligned.
12. Press TEST key.
Wait for a
reaction period of 1 minute
.
After the reaction period is finished the measurement
starts automatically.
The result is shown in the display in mg/l Silica.
prepare Zero
press ZERO
Zero accepted
prepare Test
press TEST
Countdown
1:00
Countdown
5:00
start:
5 0 3