Bürkert 8619 multiCELL WM AC, Operating Instructions Manual

Page: 130 / 194

CELL
: Choose the type of conductivity cell, 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 temperature
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 sufficiently
accurate for your process, provided the temperature of your process is always > 0 °C. Enter a compensation
between 0.00 and 9.99 %/°C in the subsequent "Coeff." field.
Use the following graph and equation to calculate the mean value of the compensation coefficient
α
according
to a temperature range
∆
T and the associated conductivity range
∆c
:
χ
χ
25
25
T [°C]
∆χ
∆
T
T
χ
T
α
=
χ
25
∆χ
∆
T
x
1
• 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 con-
centration is determined using the measured and non-compensated values of the conductivity and the temper-
ature, whatever the choice made in "Temp.Comp.".
ALARM USP : Enter a conductivity value percentage from the table "USP <645>".
T [°C]
χ
A
C
B
USP<645> graph
percentage of the USP<645> graph, set in
the "USP Alarm" field
130
Adjustmentandcommissioning
Type 8619
English