2.4.5 Calibration
Calcium Hardness Method 191 –
Calibration of a method blank
Press [MODE], [Shift] + [4] [0] keys.
Confirm with [
] key.
The display shows:
Press [Shift] + [1] keys.
The display shows:
1. Fill a clean vial (24 mm Ø) with exactly 10 ml of deio-
nised water, 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. Pipette 100 ml of water free of calcium to an appropriate
beaker (note 2, 3).
6. Add 10 CALCIO H No. 1 tablets straight from the foil
to the 100 ml of water, crush the tablets using a clean
stirring rod and dissolve the tablets completely.
7. Add 10 CALCIO H No. 2 tablets straight from the
foil to the same water, crush the tablets using a clean
stirring rod and dissolve the tablets completely.
8. Press [
] key.
Wait for a reaction period of 2 minutes.
<Calibration>
M191 Calcium Hardness 2T
prepare ZERO
press ZERO
<Calibration>
1: M191 Ca-Hardness 2
2: M191 0 Jus. Reset
3: M170 Fluoride L
Zero accepted
Countdown
2:00
start:
Mode
04
1
Zero
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