Electrical connections
12
Thermal Mass Flowmeter FMT200-ECO2
42/14-41 EN
5 Electrical connections
Please use the supplied cable for the electrical connection of the measuring sensor.On the measuring
unit, a connector is used for the coupling.
Use a 24 V DC power supply with isolation according to EN 61010 and IEC 950 with a maximum output
of < 150 W only.
5.1 Cable assignments
Table 5-1
5.2 Circuiting the signal outputs
5.2.1
Analog output
Upon selection, the analog output of the current output supplies an active signal of 0(4)...20 mA, i.e. the
FMT200-ECO2 (Sensyflow eco2) device supplies the current independently. For this reason, do not use
a 2-wire power supply unit or an active input of a PLC, but rather a passive signal receiver.
5.2.2
Digital output
Fig. 5-1 Digital output
The digital output offers a
24 V = HIGH- and
0 V = LOW signal.
The digital output can be used as active or passive output.
Color
of cores
Connector
pin number
Signal
White
#1
Analog
Brown
#2
RS 232/Txd
Green
#3
Pulse/frequency output
Yellow
#4
Power supply 24 V DC
Grey
#5
Power supply 0 V
Pink
#6
RS 232/Rxd
Blue
#7
Analog GND
Red
#8
Digital GND/fre pulse + RS 232
Shielding
–
Functional earthing
24 V
4k7
125R/45 mA
4n7
BSS123
DGND
z-20284
