SensyMaster FMT230, FMT250
THERMAL MASS FLOWMETER | OI/FMT230/250-EN REV. C
45
Terminal assignment
Figure 42: Electrical connection PA = functional ground (potential equalization)
Connections for the power supply
DC voltage
Terminal
Function / comments
1+ +
2
−
−
Connections for the outputs
Terminal
Function / comments
A / B
Modbus® RTU (RS485)
41 / 42
Passive digital output DO1
The output can be configured as a pulse output, frequency
output or switch output.
51 / 52
Passive digital output DO2
The output can be configured as a pulse output or switch
output.
Electrical data for inputs and outputs
Note
When using the device in potentially explosive atmospheres,
note the additional connection data in
Use in potentially
explosive atmospheres
on page 6!
Power supply
Supply voltage
24 V DC ± 20 %
(ripple:
≤
5 %)
Power consumption
P
≤
10 W
Digital output 41 / 42, 51 / 52
Can be configured via Modbus.
A
Passive digital output 41 / 42 as pulse or frequency output, Passive
digital output 51 / 52 as pulse output
B
Passive digital output 51 / 52 as binary output
Figure 43: Passive digital outputs (I = internal, E = external)
Pulse / frequency output (passive)
Terminals
41 / 42 (pulse / frequency output)
51 / 52 (pulse output)
Output ‘closed’
0 V
≤
U
CEL
≤
3 V
For f < 2.5 kHz: 2 mA < I
CEL
< 30 mA
For f > 2.5 kHz: 10 mA < I
CEL
< 30 mA
Output ‘open’
16 V
≤
U
CEH
≤
30 V DC
0 mA
≤
I
CEH
≤
0.2 mA
f
max
10.5
kHz
Pulse width
0.1 to 2000 ms
