Senseca ECO 522 handleiding
Handleiding
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ECO 52x series - Handheld Conductivity Meter / EC-Meter
Measurement Basics
B-H87.0.0X.DK2-4.1 Page 14 of 24
5.3 Total dissolved solids/TDS measurement
(only available at ECO 521 and ECO 522)
The total dissolved solids measurement - TDS measurement - determines the total dissolved
solids, which also called evaporation residue, based on the conductivity and a conversion
factor CtdS of the total dissolved solids. Well-suited to conduct simple concentration
measurements of salt solutions. The display shows mg/l.
Display value TDS = conductivity [in µs/cm, with nLF = 25°C] * CtdS
With selection of TDS, the necessary temperature compensation is selected automatically.
Menu settings for temperature compensation are ignored.
The following approximations apply:
CtdS
0.50
Monovalent salts with 2 ion types = NaCl, KCl or similar
0.50
Natural water of surface water, drinking water
0.65 bis 0.70
Salt concentration of aqueous fertilizer solutions
Note
These are guideline values for estimates, but are not suitable for precise measurements.
The conversion factor for the respective type of solution and the examined concentration
range must be determined for precise measurements. This can take place with calibration
to known comparison solutions or with actual evaporation of a certain amount of liquid
with measured conductivity and subsequent weight of the total dissolved solids.
5.4 Salt content / salinity measurement (only available at ECO 522)
In SAL measuring mode, the salinity, which is the salt content of sea water, is determined. The
basis for this is the International Oceanographic Tables, IOT. Standard salt water has a
salinity of 35 ‰, 35 g of salt per 1 kg of sea water. The display in % [g/kg] normally does not
show units. The designation PSU, Practical Salinity Unit, is also commonly used; the display
value is identical. The salinity measurement has temperature compensation, which means
the temperature is considered for the display and has a major influence on the display value;
any menu settings regarding temperature compensation are ignored.
Note
The salt composition of different seas is not identical. Depending on the location, weather,
seasons, etc., there are considerable deviations from the 35 ‰ according to the IOT. The
salt composition can also influence the relationship of the salinity display and the actual
amount of salt present.
Corresponding tables are available for many salts in salt water aquarium applications. Salt
weight to salinity according to the IOT or conductivity. In consideration of these tables,
very precise salinity measurements can be conducted.
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Productinformatie
| Merk | Senseca |
| Model | ECO 522 |
| Categorie | Niet gecategoriseerd |
| Taal | Nederlands |
| Grootte | 2462 MB |
