Ph-Value With Tablet - Aqualytic AL100 Instrucciones

Methods
GB

pH-value with Tablet

PH
6.5 – 8.4
Tablet Powder
Fill a clean vial (24 mm Ø) with 10 ml of the water sample and
0.0.0
perform zero calibration (see "Operation").
Tablet Powder
Add one PHENOL RED PHOTOMETER tablet straight from the foil to
the 10 ml water sample and crush the tablet using a clean stirring rod.
Close the vial tightly with the cap and swirl gently several times until
the tablet is dissolved.
Place the vial in the sample chamber making sure that the
are aligned.
Zero
Press the [ZERO/TEST] key.
Test
PH
The method symbol flashes for approx. 3 seconds.
Tablet Powder
RESULT The result is shown in the display as pH-value.
Tablet Powder
Tolerance: ± 0.1 pH
Notes:
1. For photometric determination of pH-values only use PHENOL RED tablets in black
printed foil pack and marked with PHOTOMETER.
2. Water samples with low values of Alkalinity-m (below 35 mg/l CaCO
pH readings.
3. pH-values below 6.5 and above 8.4 can produce results inside the measuring range.
A plausibility test (pH-meter) is recommended.
4. Salt error
For salt concentrations below 2 g/l no significant error, due to the salt concentration of
the reagent tablet, is expected. For higher salt concentrations the measurement values
have to be adjusted as follows:
Salt content
Correction
according to Kolthoff (1922)
1)
according to Parson und Douglas (1926)
2)
Reagent
PHENOL RED PHOTOMETER
32
All manuals and user guides at all-guides.com
30 g/l (seawater) 60 g/l
- 0,15 1) - 0,21
Form of reagent/Quantity
Tablet / 100
) may give wrong
3
120 g/l 180 g/l
2) - 0,26 2) - 0,29
Order-No.
4511770BT
AL100_10 04/2017
marks
2)