Burkert 8619 Operating Instructions Manual page 145

Type 8619
Parameters menu
PROBE: Choose the type of conductivity probe, either with 2 or 4 electrodes, connected to the module.
RTD: Choose the type of temperature sensor connected to the module.
TEMPERATURE: Choose the value of the temperature used in the process:
• choose "Auto": the temperature of the fluid is measured by the sensor.
• choose "Manual": enter the value of the process temperature (in °C) in the next field, e.g. when no tem-
perature sensor is connected to the module.
ADJUST TEMP. : The measured temperature can be corrected by an offset value. Enter the offset value in
degrees Celsius.
TEMP. COMP. : Choose the type of temperature compensation to determine the fluid conductivity:
• in accordance with a linear percentage (select "linear"). Linear temperature compensation may be suf-
ficiently accurate for your process, provided the temperature of your process is always > 0 °C. Enter a
compensation of 0.00...9.99 %/°C in the subsequent "Coeff." field.
Use the following graph and equation to calculate the mean value of the compensation coefficient a
according to a temperature range ∆T and the associated conductivity range ∆c:
• or according to the natural water law (choose "EN27888").
• or according to the ultra pure water law (choose "UPW").
• or according to the ultra pure water and sodium chloride laws (choose "UPW-NaCl").
• or according to the law of the concentration table (choose "Concentration table", available as an option)
that has been chosen in the "Concentration" function hereafter.
• or deactivate temperature compensation (choose "None").
CONCENTRATION: Available as an option. Choose the mass concentration table for your fluid from the list
offered. This data (%) is then available in the list of process variables for the conductivity module. The fluid
concentration is determined using the measured and non-compensated values of the conductivity and the
temperature, whatever the choice made in "Temp.Comp.".
χ
χ
T
∆χ
χ
25
∆T
25 T [°C]
T
∆χ
1
α =
x
χ
∆T
25
English
145