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7 Commissioning and measuring operation
Before switching on the FMG90 for the first time, please follow the instructions in the following
section.
7.1 Commissioning
Check that
the FMG90 has been installed correctly and that all screw connections are sealed.
the electrical wiring has been connected properly.
the measuring system is vented by flushing.
ª Switch on the supply voltage.
If the red LED lights permanently; then the FMG90 is ready for use and goes into measuring
operation.
7.2 Measuring operation
The red LED is constantly lit to indicate that the FMG90 is
operational.
The green LED blinks according to the frequency of the output
signal.
This blinking is not perceptible to the human eye at frequencies
above 30 to 40 Hz, so the green LED appears to be constantly lit.
Frequency output:
The frequency output provides a flow-
proportional PNP/NPN square wave signal.
8 Maintenance
Maintenance:
The FMG90 is maintenance-free and cannot be repaired by the user. In case of a defect, the
device must be replaced or sent back the manufacturer for repair.
CAUTION! Material damage!
When opening the device, critical parts or components can be damage.
ª Never open the device and perform any repair yourself.
Cleaning:
Clean the FMG90 with a dry or slightly damp lint-free cloth. Do not use sharp objects or
aggressive agents for cleaning.