6. Installation and set-up / operation / maintenance
After mounting, wiring and setting check whether the unit operates
correctly.
When the supply voltage is applied, all LEDs light and go off one after
the other.* The unit is then ready for operation.
*During this time the output signal is 20 mA.
Indication in the operating mode
Recommended maintenance
Check the sensor tip for build-up from time to time. Clean it with a
soft cloth. If necessary, build-up which adheres firmly (e.g. lime) can
be removed with a common vinegar cleansing agent.
13
ENGLISH
here with label for T-piece QL 18-18-18
LED’s green = current flow rate
(here: 1.2 - 1.4 GPM)
1st LED flashes = no flow
GN
GN
GN
GN
GN
GN
GN
GN
GN
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
