Manual
13
For manual temperature compensation, turn the function switch "FUNKTION" to the setting "man" and set
the "T-comp" control knob (Fig. 1, Pos. 3) to the actual temperature of the sample solution. A temperature
sensor is not required in the function switch "FUNKTION" setting "man".
For automatic temperature compensation, turn the function switch "FUNKTION" to the setting "auto" (with
a temperature sensor in the combicell or with a separate temperature sensor Pt 1000 connected). The
"T-comp" control knob has no function in this switch setting. The manual temperature compensation and
the automatic temperature compensation are both adapted to the change of conductivity with temperature
for natural waters.
To measure the absolute conductivity, turn the function switch "FUNKTION" to the setting "abs". In this
setting any connected temperature sensor and the manual temperature compensation have no effect. The
measuring cell constant must be set correctly (see chapter 2 "Measuring the electrical conductivity").
Dip the conductivity measuring cell and the temperature sensor (when required) into the sample solution
and take the conductivity reading on the liquid crystal display (LCD) (see Fig. 1, Pos. 2). Select the
optimum measuring range.
3 Measuring ohmic resistors
Connect the resistor which is to be measured to the 4 mm sockets marked "Zelle" (Cell) (Fig. 2, Pos. 1).
Set the measuring cell constant on the unit to "K = 1.0 cm
-1
" and turn the function switch "FUNKTION" to
the setting "abs".
After switching to the optimum measuring range, take the conductivity reading on the liquid crystal display.
In the setting "abs" and constant "K = 1.0 cm
-1
", the numerical value of the reading corresponds to the
conductance "G" of the resistor. The ohmic resistance is calculated therefrom as follows:
Ohmic resistance = 1/Conductance
R ( ) = 1/G (1/S)
4 Making temperature measurements
Connect the Temperature Sensor Pt 1000 (separately or in the combi cell).
Turn the measuring range selector switch to the setting "Temp. °C" (Fig. 1, Pos. 6).
Dip the temperature sensor into the sample solution and take the temperature reading on the liquid crystal
display.
Tolerance of the temperature measurement:
T: 0.2 K (
– 50 ... 200 °C) ± 1 digit
1 K (
– 150 ... – 50 °C)
2 K (
– 200 ... – 150 °C)
(Also depending on the tolerance of the Resistance Thermometer Pt 1000).