Measuring The Salinity - JUMO 202710/30 Operating Manual

5 Measuring
The following approximate values apply for C.tdS:
0.50
0.50
0.65 to 0.70
NOTE!
The stated values for "C.tdS" are only reference values that are good for esti-
mates but are not suitable for precise measurements.
For precise measurements, the conversion factor must be determined for the
respective solution type and the concentration range being considered.
This can be performed either through calibration with familiar comparative
solutions or through actual evaporation of a certain quantity of fluid with a
determined conductivity and subsequent weighing of the dry residue.
Select the measurand
If the device has been configured for a different measurand in a user-
defined operation, first change the measurand (see "Parameter "InP":
selection of a measurand", page 21).
If the measuring range is selected automatically (default setting), the measur-
ing range with the best dissolution is always selected from the measuring
ranges listed below.
Measuring ranges
• 0.0 to 200.0 mg/l
• 0 to 2000 mg/l
For the purpose of measurement, a fixed set measuring range can also be
selected instead of the measuring range being selected automatically, see
"Parameter "rAnG": selection of the display range or the measuring range",
page 23.
5.6

Measuring the salinity

Definition
The salinity (salt content) of seawater can be measured in the measurement
type "SAL".
The display in the device does not feature a unit and corresponds to the salt
content in g/kg (grams of salt per kilogram of seawater) or per mil (‰). The
description "PSU" (Practical Salinity Unit) is also commonly used.
The salinity measurement in this device relates to the International Oceano-
graphic Tables (IOT). Accordingly, a salinity of 35 g/kg is taken as a reference
value (standard mass concentration) for seawater.
However, depending on the location, weather, seasons, etc., the salt composi-
tion at the various measurement points may deviate from the standard mass
concentration, sometimes considerably. Refer to the IOT tables in such cases.
16
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Monovalent salts with 2 ion types (NaCl, KCl, etc.)
Natural waters/surface water, drinking water
Salt concentration of aqueous fertilizer solutions