BA-40400-02-V14 | 23
Operating instructions
5.3 Measurement output Redox potential
The REDOX potential can be used to control the disinfection perfor-
mance.
5.3.1 Technical data
Power output
Values
Input
Voltage signal of a Redox single-rod measuring cell
(0-1000 mV)
Input resistance
10
9
Ohm.
Measuring accuracy 1 % (after calibration)
The Redox potential is measured with the help of the Redox single-rod
measuring cell. It measures the voltage which exists in the water due to
oxidizing and reducing ions.
5.3.2 Calibration
Calibrate the single-rod measuring cell during startup. For calibration of
the Redox single-rod measuring cell only one reference value must be
set. The physical measurement on the measuring cell (mV) is shown on
the display during calibration.
For calibration a buffer solution is required in order to measure a defined
voltage in connection with the REDOX combination electrode. (given val-
ue: 468 mV). This value can be changed when using other buffer solu-
tions or when using single-rod measuring cells with other electrolytes.
To change, use the buttons in the operating cross. The actual voltage
measured is shown on the display during calibration. This reading dif-
fers slightly from the fixed buffer solution value. The deviation should not
exceed 10% approximately.
The plausibility of the transconductance measurement is monitored
throughout the process.
After a reaction time (approx. 1 minute) the physical value does not
change anymore.
The reference value can be now adjusted and saved by pressing “OK”.
IMPORTANT!
With older single-rod measuring cells the response
time can increase or the reading differ significantly
from the buffer solution value. This indicates that the
single-rod measuring cell must be checked and re-
placed if necessary.
The single-rod measuring cell is directly connected to the input termi-
nals of the circuit board of the input module 5-fold (see section “4.4
Technical components” on page 8).
IMPORTANT!
The measuring signal of the REDOX combination
electrode can be also configured for controlling the
disinfection.
5.4 Temperature measurement input
5.4.1 Technical data
Power output
Values
Sensor
Pt 100
Measuring range:
-50°C – +150°C
Measuring ac-
curacy
1 %
Do not use other than a two-wire "Pt 100" as sensor.
5.4.2 Adjustment
The zero point of the measuring input is set in the factory. This measur-
ing input can be adjusted with the temperature of the measuring wa-
ter of the TOPAX (see chapter “12.1.5 Menu 1.2: Calibration” on page
30).
For this purpose, measure the temperature of the sample water with
a reference thermometer and set the measured value as reference in
the TOPAX.
