SOL-96.110.051 / 260422
TOPAZ Total Hardness
Maintenance
34
6.3. Replacing Reagents
WARNING
Multiple hazards
For safe handling of the reagents, you must read and understand
the Material Safety Data Sheets (MSDS). Wear appropriate
protective equipment.
Note:
• It is recommended to replace the reagents when there is
approximately 2–3 cm of reagent left in each bottle. Do not use
up the reagents completely!
• Keep the old reagents until you are sure that the instrument
measures correctly with the new reagents.
• Do not reuse the reagent bottles as this poses a risk of
contamination or dilution errors.
Reagent
consumption
At the standard measurement interval, the following amounts of
reagents are consumed:
Hydroxynaphtol blue: 3 liters per month
Buffer D2 pH 10: 4.5 liters per month
H2SO4 2N: 3 liters per month
The concentration of the EDTA reagent varies depending on the
selected measuring range. The consumption is proportional to the
measured total hardness and amounts to approximately 36 liters per
month at the upper end of the measuring range.
Replacing
reagents
1
Prepare the reagents according to the separate method sheet.
2
Insert the reagent tubes all the way to the bottom of the corre
-
sponding bottles (see
).
3
Check that there is an additional small hole in the lid of each
bottle that allows air to enter.
Final steps
4
Priming the Reagent Tubes, p. 25
).
5
Perform a manual measurement.
If the result is satisfactory, no calibration is needed.
6
If necessary, calibrate the instrument (see
).