15
5 Measuring
Measuring ranges
• 0.0 to 200.0 µS/cm
• 0 to 2000 µS/cm
• 0.00 to 20.0 mS/cm
• 0.0 to 200.0 mS/cm
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.
5.4
Measuring the specific electrical resistivity
Definition
The specific electrical resistivity is the reciprocal of the conductivity and is
stated by the device in kOhm × cm.
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, the measuring range with the
best dissolution is always selected from the measuring ranges listed.
Measuring ranges
• 0.000 to 2.000 k
Ω
× cm
• 0.00 to 20.00 k
Ω
× cm
• 0.0 to 100.0 k
Ω
× cm
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.
5.5
Measuring the filtrate dry residue (TDS measurement)
Definition
The TDS measurement (Total Dissolved Solids) uses the conductivity and a
conversion factor "C.tdS" to determine the filtrate dry residue TDS (evapora-
tion residue). The conversion factor is entered manually in the configuration
menu of the device (see "Parameter "C.tdS": conversion factor for TDS mea-
surement", page 22).
This method is well suited to performing simple concentration measurements,
e.g. of salt solutions. The results are displayed in mg/l.
Display value TDS (in mg/l) = conductivity (in µS/cm) × C.tdS (conversion
factor) at temperature compensation (t.Cor) = "nLF" and
reference temperature (t.rEF) = 25 °C.
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