Handbook OPTIMA R FM 202201

8/12 | OPTIMA-R-FM
Measurement
The air flow transmitter measures the flow velocity dependent dynamic pressure on the measurement probe. The air
flow volume is interpreted by the transmitter in the form of analog signal U in the 0 V ... 10 V or the 2 V ... 10 V mode
from the analog output. The air flow volume q can be calculated using this analog voltage value and the nominal air
flow volume V
nom
of the measurement device. The V
nom
values are in the table of dimensions. The V
nom
is the upper
limit of the measurement range.
Mode 0 V ... 10 V
Mode 2 V ... 10 V
The actual air flow volume can be also read via Modbus or BACnet communication line when connected
to the transmitter.
Detailed description and addressing of these variables is described in the Modbus Registers or BACnet Interface
Description in Systemair DESIGN Documents section.