Siemens SITRANS F FST030, Operating Instructions Manual, Page: 118 / 142

Technical data
10.4 Outputs
SITRANS F Ultrasonic flowmeters FST030 (HART)
116
Operating Instructions, 08/2017, A5E35971532-AC
Description Channel 1
Cable Standard industrial signal cable with up to 3 twisted pairs with overall screen can be con-
nected between the transmitter and the control system. Individual pair or overall screen is
optional depending on user requirements.
Voltage range Max. 24 V DC (active)
14 to 30 V DC (passive)
Table 10- 8 Current output (Channels 2 to 4)
Description Channels 2 to 4
Signal range 0/4 to 20 mA
Resolution 0.4 μ A
Load
•
Ex i: <470 Ω
•
Non-Ex: <770 Ω
Time constant (adjustable) 0.0 to 100 s
Fault current
Measurement range (mA)
Lower fault current (mA)
Upper fault current (mA) 4-20 NAMUR
3.8 - 20.5
3.5
22.6 4-20 US
4.0 - 20.8
3.75
22.6 4-20 NAMUR
4.0 - 20.5
2.0
22.0 4-20 US
4.0 - 24.0
2.0
25.0 0-20 NAMUR
0.0 - 20.5
0.0
22.0 0-20 US
0.0 - 24.0
0.0
25.0
Customized fail-safe mode
• Last valid value
–
Lower fault current
– Upper fault current
•
Fail-safe value
•
Current value
Galvanic isolation All inputs and outputs are galvanically isolated PELV circuits with 60 V DC isolation from
each other and ground.
Maximum test voltage: 500 V AC
Cable Standard industrial signal cable with up to 3 twisted pairs with overall screen can be con-
nected between the transmitter and the control system. Individual pair or overall screen is
optional depending on user requirements.
Voltage range Max. 24 V DC (active)
14 to 30 V DC (passive)
Table 10- 9 Digital output
Description Channels 2 to 4
Pulse 41.6 µs to 5 s pulse duration
Resolution 1 μ s
Frequency 0 to 10 kHz, 50 % duty cycle, 120 % overscale provision
Resolution 0.2 Hz
Load < 750 Ω
Time constant (adjustable) 0 to 100 s
Active 0 to 24 V DC, 87 mA, short-circuit-protected