7. Adjustment
Do not carry out adjustment until all the system components are installed.
Switch on the mains voltage, the green warning light "U
B
" lights up.
Measuring instruments required for calibration:
•
Multimeter (preferably digital multimeter)
•
Conductivity measuring device (preferably with temperature compensation)
7.1 Zero calibration
Requirement: The measuring tip of the conductivity electrode is not in contact with the water.
Depending on the installation of the electrode, lower the water level in the boiler or empty the
measuring line.
Connect the multimeter to the Ø3.6 mm jack socket (8) or to the terminals (6 and 7) and set a
current of 4 mA with the potentiometer "N".
•
Turning the potentiometer clockwise gives larger values.
•
If the value “4 mA” cannot be set – check the electrical lead for compliance with
the specifications in the wiring diagram.
7.2 Sampling
Requirement:
•
Boiler in operating mode
•
Measuring tip of the dedicated measuring electrode is surrounded by boiler water
Remove boiler water via the sampling cooler and determine the conductivity "K
actual
" in μS/cm
relative to 25°C using a conductivity meter.
Caution
14
