ULTRASONIC
68
Copyright STULZ GmbH 02/1997
INFORMATION CONCERNING THE CONDUCTIMETER
6.2
Information concerning the Conductimeter
The conductimeter measures and controls the conductivity of the deminera-
lized water in µS/cm.
When a measured value of 5 µS/cm is detected, the floating contact for the
pre-alarm is activated. The contact is closed via terminals X1.9 and X1.10
and opened via terminals X1.9 and X1.8.
When a measured value of 20µS/cm is detected, the floating contact for the
alarm indication is activated. The contact is closed via terminals X1.6 and
X1.7 and opened via contacts X1.6 and X1.7.
Terminals X1.1 and 1.2 are provided for connection of an indicating instru-
ment. Output voltage is rated at 0-1 volt, which corresponds to a measuring
range of 0-50 µS/cm.
The conductivity cannot be measured by means of a multimeter.
A potentiometer is provided for final adjustment 0-1 volt. When the printed
board is tested, an adjustment can be made with the connection of resistors.
The individual resistances mentioned in the following and connected instead
of the electrode, are intended to simulate :
500 kOhm = 1 µS/cm
100 kOhm = 5 µS/cm
50 kOhm = 10 µS/cm
25 kOhm = 20 µS/cm
10 kOhm = 50 µS/cm
The electrode itself can only be checked by comparison measurement.