Measuring The Specific Electrical Resistivity; Measuring The Filtrate Dry Residue (Tds Measurement) - JUMO 202710/30 Operating Manual

Measuring ranges
5.4

Measuring the specific electrical resistivity

Definition
Select the measurand
Measuring ranges
5.5

Measuring the filtrate dry residue (TDS measurement)

Definition
• 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.
The specific electrical resistivity is the reciprocal of the conductivity and is
stated by the device in kOhm × cm.
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.
• 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.
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.
5 Measuring
15