Omega FMG90B Series, User Manual, Page: 13 / 24

FMG90B Series Commissioning and measuring operation
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6 Commissioning and measuring operation
Before switching on the FMG90B for the first time, please follow the instructions in the
following section.
6.1 Commissioning
Check that

the FMG90B 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.
6.2 Switching on and off
The FMG90B has no switch and cannot be switched on or off on its own. Switching on and
off is carried out by the applied supply voltage.

Switch on the supply voltage.
The green LED lights up. The FMG90B is ready and goes into measuring mode.
6.3 Measuring operation
In the measuring mode, the green LED flashes proportional to the measured flow.
For the human eye, the flashing is no longer visible from a frequency of ~30...40 Hz.
The green LED then seems to light up permanently.
FMG90B with frequency output:
The FMG90B provides according to the
version a flow proportional NPN, PNP or
Push-Pull square wave signal.
The frequency of the pulse output changes
according to the flow (

Fig.).
FMG90B with analog output:
According to the configuration of the FMG90B, the analog output provides a voltage or
current signal.
This signal is proportional to the measured flow. You will find the scaling of the analog output
on the type plate.