Application Notes; Water Sampling - ELECTOR MP-7 Manuel De L'utilisateur

Chapter 3 – Application Notes

3.1 Water Sampling

When measuring heating water, the circulating water is important.
Select a sampling point wich provides a good volume flow. Not suitable for sampling are dirt
separators or discharge valves at a low point in floor-standing devices and buffer storages.
Rinse the sampling point so that stagnant water does not distort the water sample. Rinse the
measuring cup and the sensors with the water. Sample the water in a moderate speed and let it
flow quietly into the measuring cup, so that no air bubbles or turbulences affect the measurement
results.
The measurement should be done immediately after sampling.
In case of combined measurement of pH and electrical conductivity, a new sample should be
taken for each measurement procedure, so that residues introduced into the water via the sensors
do not affect the subsequent measurement results.
3.2 Measuring the total hardness with the drop test
The total hardness tests consists of two bottles with 15 ml titration solution and one beaker.
Titration Solution
Fill 5 ml heating water into the beaker.
Add one drope of the titration solution to the beaker and swing it slightly.
The following results are possible:
• The color of the water changes to green. The total hardnes is <1 °dH (<17,8 mg/l or <17,8
ppm CaCo )
3
• The color changes to red. The total hardness is >1 °dH. Add dropwise the titration solution,
count each drop and swing slightly the beaker. Stop as soon as the color changes to
green. The amount of the drops correspond with the total hardnes in °dH (Degree German
Hardness).
• 1 °dH (Degree German Hardness) correspond to 17,8 mg/l or 17,8 ppm CaCo
0,1783 mmol/l.
Page 17
Central Heating Water Test Kit
Beaker
respectively
3
www.elector-water-treatment.com