Senseca ECO 531 handleiding
Handleiding
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ECO 531 - Dissolved oxygen measuring device Measurement Basics
B-H86.0.2X.DK2-4.0 Page 15 of 24
A fast occurrence shortly after first filling or an unusual high amount of them (e.g. within
some days) may be a sign of air in the sensor – either because of incorrect filling (bubbles),
not sufficiently closing membrane head or filling screw or a leaking membrane.
5.2 Instructions for oxygen measurement
The following must be observed when measuring dissolved oxygen:
The storage bottle must be removed before the measurement.
The sensor must have been calibrated.
The temperature of the sensor and the liquid to be measured should be equalized to
avoid measuring errors. The adjustment can take up to 15 minutes for large temperature
differences.
(The most accurate measurement is provided when calibrating at the measuring
temperature).
The sensor must be immersed at least 3 cm into the liquid to be measured.
A flow speed of at least approx. 30 cm/sec is necessary for exact measurements. Either
stir continuously or use an appropriate stirring device
The measurement is sensitive to jarring! Therefore, make sure that the container is not
struck with the sensor while stirring, because this can significantly impair the measured
value.
The oxygen partial pressure, oxygen concentration in mg/l and oxygen saturation in % are
calculated from the sensor signal and temperature.
The measurement is relative to water-vapour-saturated air.
5.2.1 Salinity correction
With increasing salinity SAL, which is the value for the salt content in the water, the solubility
of oxygen in water decreases, i.e. with the same oxygen partial pressure, fewer mg of oxygen
are dissolved per liter of water.
To determine this oxygen concentration, therefore, the salinity of the medium must be
entered first; see chapter 4.1.
A salinity correction is not necessary in freshwater; the value is 0. A salinity of approx. 35
PSU is normal for sea water. The salinity correction is adjusted to aqueous media having a
chemical composition corresponding to sea water. The International Oceanographic Tables
(IOT) are used as a basis for the correction
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Productinformatie
| Merk | Senseca |
| Model | ECO 531 |
| Categorie | Niet gecategoriseerd |
| Taal | Nederlands |
| Grootte | 2756 MB |
