27
Operation
– continued –
Functional test
1. To check the functions of the conductivity transmitter set code switch 10 to ON in order to simulate a
value that exceeds the measuring range limit and to provide a current output of 20 mA.
2. After finishing the functional test set the code switch back to OFF.
Code switch 10
Functional test
OFF
Normal operation
ON
Simulation: measuring range limit exceeded
LEDs and malfunction indication
The two LEDs in the centre of the electronic insert indicate the status of the conductivity transmitter.
Normal operation
Green LED
Red LED
Current output [mA]
Conductivity 0 to +10 %
of measured range
lit
proportional to measured value
Conductivity 10 to +90 %
of measured range
lit
lit
proportional to measured value
Conductivity 90 to +100 %
of measured range
lit
proportional to measured value
Flashing LEDs indicate a malfunction.
Malfunction
Green LED
Red LED
Current output [mA]
Electrode lines interrupted or measuring surface /
measuring electrodes exposed
flashing
0
Value below 0 % setting
flashing
4
Value above 100 %, e. g. measuring range too small
flashing
20
Short circuit electrode lines
flashing
0
Temperature in terminal box exceeds 85 °C
flashing
flashing
0
Lines to resistance thermometer interrupted or
short-circuited
flashing alternately
0.5
